List of Hey Arnold! episodes

This is a complete list of episodes for the animated television series Hey Arnold, which originally aired on Nickelodeon from October 7, 1996 to June 8, 2004. The series aired in reruns on Nickelodeon until 2007. Reruns have been broadcast since 2011 on Nickelodeon's sister network TeenNick during the channel's late-night television block The 90's Are All That, and still rerun on the block's re-brand, The Splat. There are 100 episodes in total.

Series overview

Season		Episodes	Originally aired
			First aired	Last aired
	Pilot		July 10, 1996
	1	20	October 7, 1996	February 14, 1997
	2	19	September 21, 1997	January 18, 1998
	3	20	August 31, 1998	March 8, 1999
	4	17	March 10, 1999	December 11, 1999
	5	24	March 4, 2001	June 8, 2004
	Television film		November 23, 2017

Episodes

Pilot (1996)

Title	Original air date
"Arnold"	July 10, 1996
Arnold accidentally knocks Harold out during a baseball game, and the bully gives Arnold 24 hours to live before he beats him to a pulp. Notes: The plot for the pilot was later used in season 1 episode 19, 24 Hours to Live. Also, the pilot never aired on television; it was shown as a theatrical short preceding the 1996 Nickelodeon movie Harriet the Spy. (The short was never included in the film's home video releases.)

Season 1 (1996–97)

No. in series	No. in season	Title	Directed by	Written by	Original air date	Production code
1	1	"Downtown as Fruits / Eugene's Bike"	Tuck Tucker & Larry Leichliter Kelly James & Juli Murphy-Hashiguchi	Craig Bartlett, Joe Ansolabehere, & Steve Viksten Steve Viksten, Joe Ansolabehere, & Craig Bartlett	October 7, 1996	1.01
Downtown as Fruits: Arnold and Gerald are cast as fruits in the school play directed by Helga, but when she doesn't treat them with the respect they deserve, they skip out on the play and take a bus ride downtown. Eugene's Bike: Arnold accidentally destroys Eugene's brand new bike, so he tries to make it up Eugene by taking him out on a day of fun, but clumsy Eugene keeps getting into accidents.
2	2	"The Little Pink Book / Field Trip"	Bert Ring & Don Judge Debbie Baber & Steve Socki	Craig Bartlett Joe Ansolabehere, Steve Viksten, & Craig Bartlett	October 23, 1996	1.02
The Little Pink Book: Helga's diary is full of poems and shrines of Arnold. Arnold and Gerald find the diary and take it to Arnold's house to determine whose diary it is. The only place Helga signed her name in the book is on the last page, and she must get it back before Arnold sees her name, even if it means spending the night in Arnold's closet. Field Trip: While on a field trip to the aquarium, Arnold sees Lockjaw, a neglected, graffiti-covered old turtle, and Arnold feels bad for it, so later that night, Arnold and Grandma sneak into the aquarium and set Lockjaw free.
3	3	"Arnold's Hat / Stoop Kid"	Tuck Tucker & Larry Leichliter Kelly James & Juli Murphy-Hashiguchi	Steve Viksten	October 30, 1996	1.03
Arnold's Hat: Helga steals Arnold's hat to complete her secret shrine — a statue in the shape of his head made from Arnold-chewed bubble gum. Arnold feels like he is nothing without his hat, so Helga is planning to return it to him — until her mother throws it in the trash, which is on its way to the dump. Stoop Kid: While playing football on the street, Arnold kicks the ball and it ends up on Stoop Kid's stoop. According to Gerald, Stoop Kid is a teenage boy who has been living on that particular stoop ever since he was born. Arnold tries to wait for him to leave so he can get his football back, but learns that he never leaves his stoop. Faced with this fact, he tries to convince Stoop Kid to overcome his habit by taking a step off the stoop.
4	4	"Helga's Makeover / The Old Building"	Kelly James & Juli Murphy-Hashiguchi Kelly James & Jamie Mitchell	Rachel Lipman Rachel Lipman & Steve Viksten	November 12, 1996	1.04
Helga's Makeover: Due to her tomboyish nature, Helga is the only girl who is not invited to Rhonda's slumber party. Feeling left out she gives herself a makeover, and goes to it anyway. The Old Building: Arnold is caught in the middle when Grandma and Ernie argue about whether an old theater should be torn down or not.
5	5	"6th Grade Girls / The Baseball"	Dan Povenmire & Juli Murphy-Hashiguchi Dan Povenmire & Dale Case	Steve Viksten Joe Ansolabehere	November 16, 1996	1.05
6th Grade Girls: Sixth grade girls Connie and Maria invite Arnold and Gerald to their school dance, but little do they know Connie and Maria are using them to make their boyfriends jealous. The Baseball: Arnold's baseball idol Mickey Kaline is about to retire so he and Gerald go to his final game.
6	6	"Heat / Snow"	Tuck Tucker & Juli Murphy-Hashiguchi Bert Ring & Steve Socki	Jonathan Greenberg Craig Bartlett & Rachel Lipman	November 20, 1996	1.06
Heat: A heat wave engulfs the city; Arnold and Gerald try to find ways to escape the heat. Snow: A snowstorm comes to the city. Arnold's Grandpa tries to teach him work ethic while his friends play without him.
7	7	"Operation Ruthless / The Vacant Lot"	Kelly James & Larry Leichliter Mark O'Hare & Larry Leichliter	Rachel Lipman & Steve Viksten Josie Nericcio	November 24, 1996	1.07
Operation Ruthless: Helga attempts to destroy Ruth McDougal, a sixth grader whom Arnold has a crush on, while at the annual city Cheese Fair. The Vacant Lot: Arnold and his friends clean up a dirty lot to play baseball on, but when the adults find the lot, they take it over and use it for their own reasons.
8	8	"The List / Haunted Train"	Mark O'Hare & Larry Leichliter Tuck Tucker & Juli Murphy-Hasiguchi	Joe Ansolabehere Josie Nericcio	November 29, 1996	1.08
The List: Arnold attempts to do everything on the legendary "List for a Kid's Perfect Saturday", but all of his plans go horribly wrong. Haunted Train: Grandpa Phil tells Arnold and his friends the tale of "The Haunted Train". Curiosity gets the best of Arnold, Gerald and Helga, so the three go to the abandoned railroad tracks to look for it.
9	9	"Mugged / Roughin' It"	Tuck Tucker & Jamie Mitchell Sherm Cohen & Alan Smart	Craig Bartlett Jonathan Greenberg	December 4, 1996	1.09
Mugged: Arnold learns the secrets of self-defense from his Grandma after getting held up by a thug. Roughin' It: Grandpa takes Arnold and Gerald on a weekend camping trip. As they set up the campsite, Bob, Helga and Phoebe show up in a high-tech RV to rough it as well. Then, as everyone hikes up a mountain trail while exploring the great outdoors, they get lost in the wilderness. Arnold and Gerald agree to help everyone find their way back to their campsite by using Grandpa's survival tips.
10	10	"Door #16 / Arnold as Cupid"	Stark Howell & Dale Case Dan Povenmire & Dale Case	Rachel Lipman Steve Viksten	December 13, 1996	1.10
Door #16: Arnold is given a package, which is for the mysterious Mr. Smith. Meanwhile, all of the boarders become curious about figuring out what is contained in it. Now, Arnold and Gerald try to make a safe delivery while searching all over town for Mr. Smith so they can give it to him. Arnold as Cupid: After getting into an argument with Suzie, Oskar is kicked out of his room in the boarding house. Feeling rejected by her, he tries to find a new room to sleep in, but no one agrees to it. Then, with no other option, he decides to move into Arnold's room. Soon, Arnold becomes tired of Oskar sleeping in his room, so Arnold plays cupid to try to string Oskar and Suzie's relationship together again.
11	11	"Arnold's Christmas"	Jamie Mitchell	Steve Viksten	December 20, 1996	1.11
Arnold tries to find Mr. Hyunh's daughter (who was separated from him during the final days of the Vietnam War) as he carries out his duty as Mr. Hyunh's secret Santa. Meanwhile, Helga must choose between a Christmas present for herself (Nancy Spumoni boots) and the perfect gift for Arnold.
12	12	"Benchwarmer / Cool Jerk"	Stark Howell & Steve Socki Rob Porter & Larry Leichliter	Jonathan Greenberg Joe Ansolabehere	December 25, 1996	1.12
Benchwarmer: Arnold and his friends play on a basketball team led by Coach Wittenburg, but he tells the team to pass the ball to one kid only – his son, Tucker. Cool Jerk: A cool older boy named Frankie G. befriends Arnold, but Arnold soon realizes that Frankie G. and his other friends are criminals.
13	13	"Das Subway / Wheezin' Ed"	Tuck Tucker & Steve Socki Dan Povenmire & Juli Murphy-Hashiguchi	Chris Simmons Craig Bartlett, Rachel Lipman, & Steve Viksten	December 30, 1996	1.13
The Subway: The gang encounters trouble while traveling on the subway. Wheezin' Ed: The gang travels to Elk Island to find a pirate treasure said to be haunted by a gangster with a breathing problem.
14	14	"Tutoring Torvald / Gerald Comes Over"	Sherm Cohen & Larry Leichliter Bert Ring & Juli Murphy-Hashiguchi	Joe Ansolabehere Craig Bartlett & Rachel Lipman	January 5, 1997	1.14
Tutoring Torvald: Arnold must tutor a 13-year-old, fourth-grade bully in math, much to his dismay. Gerald Comes Over: Gerald visits Arnold's boarding house and meets the eccentric boarders.
15	15	"Spelling Bee / Pigeon Man"	Frank Nissen & Steve Socki Jamie Mitchell & Larry Leichliter	Joe Ansolabehere Joseph Purdy	January 11, 1997	1.15
Spelling Bee: Arnold competes in a Tri-City spelling bee to win money for a keyboard, but faces competition against Helga, who's being pushed by her father to win so she can follow in her sister's footsteps. Pigeon Man: Arnold confronts a man that has known and trusted pigeons all his life after one of his gets sick.
16	16	"Olga Comes Home / Sally's Comet"	Stark Howell & Larry Leichliter Dan Povenmire & Howie Parkins	Steve Viksten Joseph Purdy	January 15, 1997	1.16
Olga Comes Home: Jealous about her smart, talented, popular older sister Olga returning home from college, Helga fiendishly changes one of her grades from an A to B+, which sends Olga into a deep depression. Sally's Comet: Arnold and Gerald mail in cereal box tops to receive a telescope so they can see the well-known interstellar event known as Sally's Comet. The problem is that it's too bright for them to see the stars. Now they try to convince everybody in the city to turn off their lights.
17	17	"Abner Come Home / The Sewer King"	Cullen Blaine & Howie Parkins Tuck Tucker & Alan Smart	Joe Ansolabehere Keith Kaczorek	January 20, 1997	1.17
Abner Come Home: Abner, Arnold's beloved pet pig, sees a cat out the window and he runs out of the boarding house to chase it, which leads to him running far away from home. The next morning, Arnold wakes up to realize that Abner is gone. Later, he announces a search party so everyone can help find Abner before something bad happens to him. The Sewer King: While Arnold goes out to bring Grandpa his golden watch back from the store, he sees a gigantic hole being dug for new sewer pipes at a construction site. As he looks down it, the watch falls out of his pocket and into the sewer. Now, Arnold and Gerald must go down there to retrieve it, only to find that it's in possession of the Sewer King.
18	18	"False Alarm / World Records"	Kelly James & George S. Chialtas	Rachel Lipman & Steve Viksten Joe Ansolabehere	January 25, 1997	1.18
False Alarm: Eugene is framed for pulling the fire alarm at school. Arnold interrogates his friends in a makeshift courtroom in the library to discover the real culprit (Which in the end it was Curly who did it). World Records: Arnold and his friends try to get into the Guinness Book of Records.
19	19	"Magic Show / 24 Hours to Live"	Dan Povenmire & Juli Murphy-Hasiguchi Craig Bartlett & Larry Leichliter	Glen David Gold Craig Bartlett, Steve Viksten, & Joe Ansolabehere	January 30, 1997[1]	1.19
Magic Show: Arnold picks Helga for his disappearing act, but when Helga decides to run off to trick Arnold, she knocks herself out and dreams of a world where no one misses her now that she's gone. 24 Hours to Live: In this remake of the original pilot, Arnold accidentally knocks Harold out during a baseball game, and the bully gives Arnold 24 hours to live before he beats him to a pulp.
20	20	"Arnold's Valentine"	Jamie Mitchell	Steve Viksten & Rachel Lipman	February 14, 1997	1.20
On Valentine's Day, Arnold manages to arrange two dates; one with Ruth, the sixth grader he likes, and one with his French penpal Cecile (actually, it's Helga in disguise) – only for the real Cecile to suddenly appear and Arnold to discover what Ruth is really like.

Season 2 (1997–98)

No. in series	No. in season	Title	Directed by	Written by	Original air date	Production code
21	1	"Save the Tree / New Teacher"	Dan Povenmire	Joseph Purdy	September 21, 1997	2.22
Save the Tree: Arnold and the gang must stop Big Bob from chopping down the oldest tree in town. New Teacher: When the kids make their new teacher, Mr. Simmons, quit his job, the replacement makes them realize what they lost. Note: First appearance of the new teacher Mr. Simmons and General Sgt. Goose. Mr. Simmons was in the first episode of the second season.
22	2	"Helga's Love Potion / Gerald's Secret"	Dan Povenmire Tuck Tucker	Craig Bartlett Jonathan Greenberg	September 28, 1997	2.23
Helga's Love Potion: Helga drinks a potion to lose all feelings for Arnold. Gerald's Secret: Gerald's secret is revealed; he doesn't know how to ride a bike, so Arnold teaches him how.
23	3	"The Big Scoop / Harold's Kitty"	Stark Howell Steve Socki	Joseph Purdy Jordana Arkin & Steve Viksten	October 5, 1998	2.24
The Big Scoop: Arnold and Gerald compete against Helga in the school newspaper, but they find out that Helga is adding fake information for her newspaper. Harold's Kitty: When Harold is walking in the street, he finds a kitty that belongs to an old lady and he takes it, but then everybody appears, and Harold has to surrender the kitty to the old lady.
24	4	"Longest Monday / Eugene's Pet"	Derek Drymon & Larry Leichliter Derek Drymon & George S. Chialtas	Jonathan Greenberg Antoinette Stella	October 12, 1997	2.25
Longest Monday: Schoolyard tradition has it that on the first Monday of June each year, the fifth graders throw the fourth graders into trash cans. So, Arnold and Gerald try to make a run for it. As more people are thrown into trash cans and the fifth graders know all the routes, Arnold and Gerald find out eluding the fifth graders is harder that they thought. Eugene's Pet: After Arnold accidentally kills Eugene's fish with a yo-yo, he must do something to make up for it. Note: First appearance of Wolfgang, Edmund, Mickey the Weasel, and the other 5th graders. Wolfgang was voiced by Toran Caudell, who voiced Arnold in the first season.
25	5	"Monkey Business / Big Caesar"	Tuck Tucker Dan Povenmire	Steve Viksten Jonathan Rosenthal & Craig Bartlett	October 19, 1997	2.26
Monkey Business: An organ grinder's monkey kisses Helga, who is convinced she has caught "monkeynucleosis". Big Caesar: Arnold and Gerald do a spot of fishing, determined to catch the pond's biggest fish, the legendary "Big Caesar".
26	6	"Ransom / Ms. Perfect"	Steve Socki	Jonathan Greenberg Steve Viksten	October 26, 1997	2.27
Ransom: Gerald and Arnold get on the case when Timberly's doll goes missing. Ms. Perfect: The new girl is teased at school by Helga and the other girls, but she's soon accepted by everyone.
27	7	"Arnold's Halloween"	Jamie Mitchell	Craig Bartlett, Joseph Purdy, & Antoinette Stella	October 27, 1997	2.32
This episode is a parody of the panic caused by Orson Welles' adaptation of "The War of the Worlds". The whole city mistakes a Halloween prank set up by Arnold and Gerald as an actual alien invasion.
28	8	"Arnold Saves Sid / Hookey"	Stark Howell Steve Socki	Steve Viksten Jim Ryan	November 2, 1997	2.28
Arnold Saves Sid: After Arnold saves Sid from an injury, Sid devotes himself to paying Arnold back with unending kindness. Hooky: Arnold and Gerald bunk off school, but their day is ruined by their fear of being found out.
29	9	"Freeze Frame / Phoebe Cheats"	Tuck Tucker	Joseph Purdy Antoinette Stella	November 9, 1997	2.29
Freeze Frame: Arnold and Gerald go around the city following "Porkpie", a mysterious man caught on film. They suspect, because of the clues, that Porkpie are planning to kill "Marty", who turns out to be Mr. Green. Phoebe Cheats: In this variation of "The Tell-Tale Heart", Phoebe plagiarizes from a poetry book and uses one of the poems as her entry in a poetry contest. She wins, with her prize being a trophy resembling poet Emily Dickinson. Then, the trophy haunts Phoebe into confessing.
30	10	"Mud Bowl / Gerald Moves Out"	Stark Howell	Jonathan Greenberg Steve Viksten & Danica Ivancevic	November 16, 1997	2.30
Mud Bowl: Wolfgang and his gang of fifth graders challenge Arnold and his friends to a football game, but he has to first persuade them that his plays are good enough for them to win. Gerald Moves Out: Gerald, getting tired of his family bugging him, moves out of his home and into Arnold's boarding house, only to realize emancipation is not all it is cracked up to be.
31	11	"The High Life / Best Friends"	Derek Drymon Steve Socki	Lesa Kite Jonathan Greenberg	November 23, 1997	2.31
The High Life: Gerald becomes an entrepreneur out of selling watches until the market becomes saturated. Best Friends: Rhonda and Nadine fall out over working on a project at school, leaving Arnold to work with both of them separately.
32	12	"Steely Phil / Quantity Time"	Stark Howell Steve Socki	Steve Viksten	November 30, 1997	2.33
Steely Phil: Arnold's Grandpa enters a Chinese Checkers tournament to reclaim his pride lost forty years ago. Robby Fisher's name is a parody of Bobby Fischer. Quantity Time: Helga's mother tries to let her and her father, Bob, bond.
33	13	"Eating Contest / Rhonda's Glasses"	Steve Socki & Kelly James Larry Leichliter	Joseph Purdy Antoinette Stella	December 7, 1997	2.34
Eating Contest: Arnold enters an eating contest. Rhonda's Glasses: Rhonda gets glasses and finds out what it is like to be a "Geek".
34	14	"Helga's Boyfriend / Crush on Teacher"	Tuck Tucker & Larry Leichliter Stark Howell & George S. Chialtas	Steve Viksten & Rachel Lipman Joseph Purdy	December 14, 1997	2.35
Helga's Boyfriend: Helga uses Stinky as her boyfriend to try to make Arnold jealous. Crush on Teacher: Arnold develops a crush on Miss Felter, a substitute teacher, thinking he is having dinner at her house, only to realize that the one she invited was her fiance, whose name is also Arnold.
35	15	"Hall Monitor / Harold's Bar Mitzvah"	Kelly James & Steve Socki Dan Povenmire & Juli-Murphy Hashiguchi	Rachel Lipman Joseph Purdy	December 21, 1997	2.36
Hall Monitor: Phoebe becomes hall monitor and asks Helga for tips. She becomes overwhelmed by the "power" and soon everyone wants the old Phoebe back, even Helga once she realizes Phoebe's also giving her detentions. Harold's Bar Mitzvah: Harold runs away from his Bar Mitzvah, thinking he will retain his childhood this way.
36	16	"Coach Wittenberg / Four-Eyed Jack"	Stark Howell & Larry Leichliter Tuck Tucker & George S. Chialtas	Jonathan Greenberg Craig Bartlett	December 28, 1997	2.37
Coach Wittenberg: Arnold and his friends get Coach Wittenberg to be their new bowling coach. Four-eyed Jack: The ghost of a former boarding house resident is believed to have been causing strange occurrences in there when Arnold and Gerald find an old pair of glasses believing to have belonged to him.
37	17	"Eugene Goes Bad / What's Opera, Arnold?"	Tuck Tucker Dan Povenmire & Steve Socki	Steve Viksten Craig Bartlett	January 4, 1998	2.38
Eugene Goes Bad: After finding out that his idol is a haughty, primped actor, Eugene sets out to become bad. What's Opera, Arnold?: Helga and Arnold fall asleep and have their own "parody/dream" of the opera Carmen.
38	18	"Tour de Pond / Teachers Strike"	Dan Povenmire & Juli-Murphy Hashiguchi Kelly James & Steve Socki	Rick Gitelson Rachel Lipman & Joseph Purdy	January 14, 1998	2.39
Tour de Pond: Arnold and a descendant of his grandpa's arch enemy, Rex Smythe-Higgins, compete in a boat race. Teachers Strike: Teachers of Arnold's school go on strike because of inadequate funding; He and his friends are on cloud nine, only to find out that every lost school day will be taken from their summer vacation.
39	19	"Runaway Float / Partners"	Rob Porter & Larry Leichliter Dan Povenmire & Juli Murphy-Hashiguchi	Jonathan Greenberg Jonathan Greenberg & Steve Viksten	January 18, 1998	2.40
Runaway Float: After creating an idea for a parade float, Arnold is confident of it showing up in a parade. Partners: A lounge singer moves into the Sunset Arms after renouncing his songwriter, who also moves there.

Season 3 (1998-99)

No. in series	No. in season	Title	Directed by	Written by	Original air date	Production code
40	1	"Helga Blabs It All / Harold the Butcher"	Tuck Tucker Larry Leichliter & Stark Howell	Craig Bartlett Joseph Purdy	August 31, 1998	3.41
Helga Blabs It All: While under the influence of laughing gas, Helga leaves a message on Arnold's answering machine confessing her love for him. When she finally comes to, she realizes that she has to get to Arnold's answering machine and delete the message before he can hear it, but the task will prove hard. Harold the Butcher: As punishment for shoplifting a ham, Harold is forced to work for Mr. Green at his butcher shop for a week. Later, after his work shift to pay for it is over, he soon learns that he actually likes his new after-school job and doesn't want to stop working there, much to the dismay of Mr. Green (at least at first).
41	2	"Dangerous Lumber / Mr. Hyunh Goes Country"	Sherm Cohen & Frank Weiss Stark Howell	John D. Beck & Ron Hart Steve Viksten & Joseph Purdy	September 2, 1998	3.42
Dangerous Lumber: Arnold has a lethal baseball bat swing, causing him to unintentionally knock out other players, so he decides never to play the sport again, mere days before a baseball game against the fifth graders. Mr. Hyunh Goes Country: Mr. Hyunh has a talent for country singing, so Arnold and Gerald, after recording a CD with him at the local studio, become his managers and make him a big star, much to his dislike. (Guest voice: Randy Travis)
42	3	"Casa Paradiso / Gerald's Tonsils"	Steve Socki Sherm Cohen & Frank Weiss	Joseph Purdy Craig Bartlett	September 7, 1998	3.43
Casa Paradiso: When an irritated Grandpa Phil decides to sell the boarding house to go live in a condo, Arnold and the boarders try to get him to change his mind. Gerald's Tonsils: Gerald's voice is deepened after having his tonsils out, just a few days before the school recital.
43	4	"Arnold's Room / Helga vs. Big Patty"	Tuck Tucker Steve Socki & Kelly James	Joseph Purdy Steve Viksten	September 9, 1998	3.44
Arnold's Room: Sid pretends that Arnold's room is his room when he studies with Lorenzo, a rich classmate. Helga vs. Big Patty: Patty challenges Helga to a fight after Helga gets on her last nerves by picking on her once too many.
44	5	"Stinky Goes Hollywood / Olga Gets Engaged"	Tuck Tucker Dan Povenmire	Steve Viksten Antoinette Stella	September 16, 1998	3.45
Stinky Goes Hollywood: Stinky becomes the new Yahoo Soda poster child, but gives it up when it's revealed that he was hired as a joke. Olga Gets Engaged: Olga gets engaged to a con man who does not exactly woo Helga as he did the rest of her family, but she decides to let the marriage happen so Olga can be miserable. But she is given a change of heart from Arnold, and attempts to stop it.
45	6	"Curly Snaps / Preteen Scream"	Steve Socki & Kelly James Dan Povenmire	Joseph Purdy	September 23, 1998	3.46
Curly Snaps: Curly locks himself in the principal's office after being skipped as the person who collects kick balls after recess. Preteen Scream: Phoebe wins a chance to meet her favorite singer, only to find out that he doesn't write or sing his own songs.
46	7	"Grandpa's Birthday / Road Trip"	Sherm Cohen & Steve Socki Tuck Tucker	Craig Bartlett Jonathan Greenberg	September 30, 1998	3.47
Grandpa's Birthday: Grandpa thinks he's going to die when he turns 81 because of a "family curse". Road Trip: When Bob has to go to a business meeting, Miriam and Helga are forced to go on the family road trip by themselves.
47	8	"Sid's Revenge / Roller Coaster"	Dan Povenmire Larry Leichliter & Christine Kolosov	Michelle Lamoreaux Joseph Purdy	October 7, 1998	3.48
Sid's Revenge: Sid swears vengeance with a voodoo doll made out of a bar of soap carved into the form of Principal Wartz for giving him detention for a prank he didn't pull, and then believes that he killed him. Roller Coaster: A roller coaster breaks down while Eugene and Arnold are at the top of its tallest drop.
48	9	"The Aptitude Test / Oskar Gets a Job"	Stark Howell Steve Socki	Antoinette Stella Steve Viksten	October 14, 1998	3.49
The Aptitude Test: Helga thinks she's dim because she failed an aptitude test at school, only to discover she received Harold's test score, and vice versa. Oskar Gets a Job: Oskar gets a job as a newspaper carrier but uses Arnold as cover for his laziness.
49	10	"Arnold Betrays Iggy / Helga and the Nanny"	Dan Povenmire Sherm Cohen & Steve Socki	Steve Viksten Joseph Purdy	October 19, 1998	3.50
Arnold Betrays Iggy: Arnold accidentally finds out that Iggy wears pink bunny pajamas, and Iggy makes him promise not to tell. The next day, Sid and Stinky guess the secret by pure contrived chance, putting Arnold and Iggy's friendship to the test. Helga and the Nanny: Bob hires a nanny to help Miriam around the house, much to Helga's dismay. From this moment on, Helga attempts to scare the nanny away.
50	11	"Career Day / Hey Harold!"	Dan Povenmire Steve Socki & Kelly James	Jonathan Greenberg Steve Viksten	October 21, 1998	3.51
Career Day: Arnold gets paired with the bitter Jolly Olly Man as part of Career Day. Hey Harold!: Harold is invited to Rhonda's party and befriends the female bully, Big Patty.
51	12	"Best Man / Cool Party"	Sherm Cohen & Christine Kolosov Dan Povenmire	Steve Viksten Craig Bartlett	November 2, 1998	3.52
Best Man: Coach Wittenburg assigns Arnold the duty of best man at his second wedding. Cool Party: Rhonda holds a cool-people-only party at her house. In retaliation, Arnold and his friends hold a "geek" party on the roof of his boarding house further up the street, leaving Rhonda's party deserted.
52	13	"Arnold & Lila / Grand Prix"	Steve Socki Stark Howell & Larry Leichliter	Steve Viksten Joseph Purdy	November 4, 1998	3.53
Arnold & Lila: Arnold gets more attention than he bargained for from Lila after Helga writes "Arnold Loves Lila" on the wall, and Lila finds out about it. Grand Prix: The kids compete in a grand prix race against each other.
53	14	"Arnold's Thanksgiving"	Larry Leichliter	Craig Bartlett, Joseph Purdy, & Steve Viksten	November 18, 1998	3.54
Arnold and Helga are sick of their families' Thanksgiving traditions. They meet and go to Mr. Simmons', only to realize that, compared to Thanksgiving with his family, theirs aren't so bad after all.
54	15	"Helga's Show / The Flood"	Stark Howell Christine Kolosov	Steve Viksten Antoinette Stella	November 25, 1998	3.55
Helga's Show: Helga tells jokes about her classmates, who take offense to it. The Flood: The town is flooded and Arnold's class is trapped in the school.
55	16	"Phoebe Takes the Fall / The Pig War"	Larry Leichliter & Tuck Tucker Dan Povenmire	Joseph Purdy Craig Bartlett	December 7, 1998	3.56
Phoebe Takes the Fall: Helga demands that Phoebe lose a quiz competition to impress her competitive father. The Pig War: Arnold, Grandpa, and friends reenact the Pig War. Note: "The Pig War" was inspired by an actual border conflict in Washington state's San Juan Islands in 1859.
56	17	"Part-Time Friends / Biosquare"	Stark Howell & Juli Murphy-Hashiguchi Kelly James & Steve Socki	Joseph Purdy Jordana Arkin	December 7, 1998	2.21
Part-Time Friends: Arnold is okay with working with Gerald at Mrs. Vitello's flower shop, but not with working for Gerald, which causes the friendship to hit a snag. Biosquare: As a science assignment, Arnold and Helga have to work together, and get along with each other, for 24 hours in the Sunset Arms greenhouse.
57	18	"Crabby Author / Rich Kid"	Sherm Cohen & Larry Leichliter Larry Leichliter & Christine Kolosov	Steve L. Hayes Joseph Purdy	December 28, 1998	3.57
Crabby Author: Arnold does his school report on an author he likes, only to find out that she's a grumpy, old hag. Rich Kid: Lorenzo, a neurotic rich kid, comes to P.S. 118. All the kids try to help him become an average kid. *Note: Lorenzo had already appeared in the previous episodes "Arnold's Room", "Cool Party", and various season 3 episodes.
58	19	"Girl Trouble / School Dance"	Sherm Cohen & Frank Weiss Stark Howell	Craig Bartlett Steve Viksten	January 4, 1999	3.58
Girl Trouble: Arnold snaps at school after Helga tries his patience once too often. School Dance: Arnold is in charge of the school dance. He books has-been singer Dino Spumoni, and when he sings a depressing "good-bye" song, all fingers point at Arnold.
59	20	"School Play"	Steve Socki	Steve Viksten	March 8, 1999	3.59
After hearing that Arnold is Romeo in the school play of Romeo and Juliet, Helga does everything she can to get the part of Juliet and kiss him. Note: This is the last episode with Phillip Van Dyke voicing Arnold.

Season 4 (1999)

No. in series	No. in season	Title	Animation Director	Written by	Original air date	Production code
60	1	"Full Moon / Student Teacher"	Frank Weiss	Steve Viksten Michelle Lamoreaux & Steve Viksten	March 10, 1999	4.63
Full Moon: Harold, Sid, and Stinky all moon Principal Wartz, but Arnold is blamed, even though he was just an innocent bystander. Student Teacher: Helga's sister Olga comes home for spring break and becomes a classroom aid in Helga's class, much to Helga's chagrin. Note: This is the first episode with Spencer Klein as the voice of Arnold, this is also the first episode to use digital ink and paint.
61	2	"Big Gino / Jamie O. in Love"	Christine Kolosov	Joseph Purdy Michelle Lamoreaux	March 15, 1999	4.64
Big Gino: After Sid works off a debt with loan shark Big Gino, the two become friends, but when Sid is told to give Arnold a swirlie, he has to choose between the two. Jamie O in Love: Gerald's older brother Jamie O has a sudden burst of kindness when he finds a girlfriend, but Arnold and Gerald soon find out that the girl is just using Jamie O.
62	3	"Eugene's Birthday / Stinky's Pumpkin"	Christine Kolosov Frank Weiss	Craig Bartlett Joseph Purdy	March 17, 1999	4.61
Eugene's Birthday: After losing Eugene's birthday party invitations, Arnold feels obliged to throw him another party, but it doesn't work out. Stinky's Pumpkin: Stinky grows a huge pumpkin to enter in a city competition.
63	4	"The Beeper Queen / Oskar Can't Read?"	Frank Weiss	Michelle Lamoreaux Joseph Purdy	March 29, 1999	4.65
The Beeper Queen: After Bob pops his spine, Miriam runs Big Bob's Beepers. She gets in over her head and forgets about her family. Oskar Can't Read?: Arnold finds out that Oskar is illiterate and tries to teach him to read.
64	5	"Dinner for Four / Phoebe Skips"	Frank Weiss Christine Kolosov	Steve Viksten Michelle Lamoreaux	March 31, 1999	4.62
Dinner for Four: Helga wants to show Arnold that she can be as sophisticated as Lila is by taking him, Gerald, and Phoebe out to dinner with a coupon she won. She devises a plan to get out of paying when she discovers they're at the wrong restaurant. Phoebe Skips: Phoebe is promoted to the sixth grade, but realizes that her new so-called "friends" are just using her to do their homework.
65	6	"Helga's Parrot / Chocolate Turtles"	Frank Weiss Christine Kolosov	Antoinette Stella Craig Bartlett	April 5, 1999	4.67
Helga's Parrot: A sleep-talking Helga confides into Bob's parrot about her love for Arnold. The next day, the parrot flies into Arnold's window, and it is up to Helga to get it. Chocolate Turtles: Crisis strikes when Gerald's little sister, Timberly, eats a stock of chocolate turtles that he and Arnold are supposed to sell for a local scout organization.
66	7	"Love and Cheese / Weighing Harold"	Frank Weiss Christine Kolosov	Steve Viksten	April 7, 1999	4.68
Love and Cheese: Helga tries to separate Arnold from Lila while at the annual Cheese Fair. Weighing Harold: Harold, after discovering his friends think he is obese, decides to go on a weight-loss cruise. When he comes back, though, he is noticeably larger.
67	8	"Back to School / Egg Story"	Frank Weiss	Craig Bartlett Celia Bonaduce, Michelle Lamoreaux, & Steve Viksten	September 11, 1999	4.72
Back to School: After Grandpa tells Arnold that he never got his grade school diploma, Arnold convinces him to come to go back to school at P.S. 118. Egg Story: Arnold and Helga must care for an egg for a school project about parenting. Meanwhile, Rhonda and Harold are project partners and must also take care of an egg.
68	9	"It Girl / Deconstructing Arnold"	Christine Kolosov Frank Weiss	Jonathan Greenberg Michelle Lamoreaux	September 18, 1999	4.69
It Girl: Helga becomes a model, but she quits after she gets irritated at everyone dressing like her. Deconstructing Arnold: Arnold's classmates are tired of constantly telling them the right thing to do, so he stops giving them advice. Nevertheless, when his classmates get into sticky situations, they are in desperate need of his advice.
69	10	"Grudge Match / Polishing Rhonda"	Frank Weiss Christine Kolosov	Joseph Purdy Michelle Lamoreaux	September 25, 1999	4.70
Grudge Match: After getting in a car accident, Bob and Grandpa face off on the golf green, with the loser having to pay for the damage to both cars. Polishing Rhonda: Rhonda attends a finishing school, but is far from impressive with her stroppy attitude, and seeks help from fellow student Big Patty.
70	11	"Weird Cousin / Baby Oskar"	Christine Kolosov Frank Weiss	Michelle Lamoreaux & Steve Viksten Steve Viksten	October 9, 1999	4.73
Weird Cousin: Arnold's bland country cousin, Arnie, comes to visit. Arnold begins to notice that Arnie and Lila show interest in each other, making him jealous. Baby Oskar: Oskar has to take care of his infant cousin-in-law (also named Oskar), while both Susie and her cousin are gone.
71	12	"Grandpa's Sister / Synchronized Swimming"	Christine Kolosov	Craig Bartlett Joseph Purdy	October 16, 1999	4.76
Grandpa's Sister: Phil's twin sister (voiced by Phyllis Diller) comes for a visit, bringing along an unsettled conflict between them. Synchronized Swimming: Arnold and the gang are part of a synchronized swimming team led by Coach Wittenburg.
72	13	"Helga Sleepwalks / Fighting Families"	Christine Kolosov Frank Weiss	Michelle Lamoreaux Joseph Purdy	October 23, 1999	4.74
Helga Sleepwalks: After eating pork rinds, Helga sleepwalks, uttering her secret about Arnold as she does so. Fighting Families: Arnold, Grandpa, Grandma, Ernie, and Mr. Hyunh compete on a game show against a "perfect" family from PS 119 (Guest starring: Ryan Seacrest)
73	14	"Headless Cabbie / Friday the 13th"	Christine Kolosov	Joseph Purdy Antoinette Stella	October 30, 1999	4.66
Headless Cabbie: Arnold tells an urban legend about a decapitated taxi driver. The gang goes out, only to find the details in the story are becoming real. Friday the 13th: Arnold and Gerald try to prove superstitions are fictitious, only for it all to backfire on them.
74	15	"Veterans Day"	Christine Kolosov	Steve Viksten	November 6, 1999	4.71
Arnold's Grandpa recalls his adventures as a soldier in the Second World War, outwitting a regiment of Nazis, while Gerald's dad, Martin, remembers his own time serving in Vietnam.
75	16	"Helga on the Couch"	Christine Kolosov	Craig Bartlett	December 4, 1999	4.78
Helga confides in the school psychiatrist about her social life, family life, and her love for Arnold. (Guest starring Kathy Baker)
76	17	"Dino Checks Out"	Frank Weiss	Steve Viksten	December 11, 1999	4.79
Dino Spumoni is found missing and then declared dead after what appears to be a suicide attempt. but Arnold finds out that this isn't the case, and he secretly lives in the boarding house, believing that his work will skyrocket in value after his "death".

Season 5 (2001–04)

No. in. series	No. in season	Title	Animation Director(s)	Written by	Original air date	Production code
77	1	"Monkeyman! / Buses, Bikes, and Subways"	Frank Weiss Christine Kolosov	Craig Bartlett	March 4, 2001	4.75
Monkeyman!: When Arnold gives the superhero Monkeyman a taste of normal life, he's far too busy to bother helping the weak and downtrodden. Buses, Bikes, and Subways: Helga and Harold must return to town on their own after the bus leaves them behind after a school trip to a chocolate factory, and Helga has tickets for a wrestling match and she can't be late.
78	2	"Helga's Masquerade / Mr. Green Runs"	Frank Weiss	Michelle Lamoreaux Joseph Purdy	March 11, 2001	4.77
Helga's Masquerade: Helga decides to act like Lila so Arnold will like her. Mr. Green Runs: Mr. Green runs for city council.
79	3	"Sid the Vampire Slayer / Big Sis"	Christine Kolosov	Michelle Lamoreaux	March 18, 2001	5.81
Sid the Vampire Slayer: Sid thinks Stinky is a vampire. Big Sis: Olga gets into a "Big Sis" program, but her "Lil' Sis" is Lila.
80	4	"Bag of Money / Principal Simmons"	Christine Kolosov	Steve Viksten Joseph Purdy	April 5, 2001	5.83
Bag of Money: Arnold, Sid, and Gerald find a bag filled with money, though they do not know what to do with it, so Arnold is selected to hold onto it for the time being. However, when Arnold inadvertently loses the money on the way home, his friends begin to believe that he actually stole the money, so he must work to prove his innocence. Principal Simmons: When Mr. Simmons is upset that Principal Wartz is being too strict with the students, Wartz decides to resign and he selects Mr. Simmons to take his place. The newly promoted Principal Simmons decides to make massive reforms to permit the school environment to be more liberal, though will the students at P.S. 118 appreciate his authority?
81	5	"New Bully on the Block / Phoebe Breaks a Leg"	Frank Weiss	Craig Bartlett Michelle Lamoreaux	April 12, 2001	5.84
New Bully on the Block: The kids must face two bullies when a new kid, Ludwig, returns and challenges Wolfgang for the vacant lot. Phoebe Breaks a Leg: When Phoebe breaks a leg after being hit by a truck, Helga believes it's her fault (and it is), so she starts being nice to Phoebe. Yet when Phoebe's leg heals, she decides to stay disabled for a little longer.
82	6	"Helga's Locket / Sid and Germs"	Frank Weiss Christine Kolosov	Joseph Purdy Antoinette Stella	April 19, 2001	5.86
Helga's Locket: Helga inscribes her name in her Arnold locket. Arnold's grandpa gets a hold of Helga's locket. He thinks it's an anniversary gift from Grandma. So Helga must find a way to get it back before Arnold finds out her secret. Sid and Germs: Sid becomes obsessed with cleanliness.
83	7	"Suspended / Ernie in Love"	Frank Weiss Christine Kolosov	Jonathan Greenberg Steve Viksten	April 26, 2001	5.89
Suspended: Harold gets suspended and will do anything to get back into school. Ernie in Love: Ernie starts dating a tall model, but she doesn't want to continue dating him because of his height.
84	8	"Parents Day"	Larry Leichliter & Tuck Tucker	Craig Bartlett & Antoinette Stella	May 10, 2001	3.60
Parents Day: Arnold asks Grandpa Phil what really happened with his parents, and he finds out that they disappeared after they left the country on a plane, although they might still be alive. Note: This is the last episode to be animated with traditional cel animation.
85	9	"Summer Love (a.k.a. Beach Story)"	Christine Kolosov & Frank Weiss	Joseph Purdy & Michelle Lamoreaux	June 21, 2001	4.80
Summer Love (a.k.a. Beach Story): When Arnold, the boarders, and the Patakis go to the beach, a girl uses Arnold to win a sandcastle competition. Ernie gets buried in the sand. Miriam and Suzie start taking dancing lessons. Grandpa Phil thinks he's stuck on an island. Oskar starts using a metal detector to find "treasure". Big Bob gets a bad sunburn. Helga tries to warn Arnold that he's just being used.
86	10	"Stuck in a Tree / Rhonda Goes Broke"	Christine Kolosov Frank Weiss	Joseph Purdy & Steve Viksten Robert Lamoreaux	January 5, 2002	5.85
Stuck in a Tree: Arnold gets stuck in a tree with Harold and Eugene. Rhonda Goes Broke: Rhonda's family goes broke and they move into the boarding house.
87	11	"Beaned / Old Iron Man"	Frank Weiss	Michelle Lamoreaux Jonathan Greenberg	January 12, 2002	5.87
Beaned: When Helga gets hit with a baseball during a game, she develops a case of amnesia, so Arnold stays with her all day because he feels responsible. The next day, Helga regains her memories, though, when she realizes what Arnold is doing, she decides to continue to play the part of an amnesiac in hopes of spending more time with him. Old Iron Man: Grandpa Phil and his old friend have been feuding for quite some time, as their friendship fell apart years ago. However, they still attempt to compete with one another as they each believe they are the better individual; though when both men decide to enter the extremely dangerous Old Iron Man triathlon, Arnold attempts to put an end to their feud, as he does not believe they should risk their lives over something so trivial.
88	12	"Arnold Visits Arnie / Chocolate Boy"	Christine Kolosov Frank Weiss	Michelle Lamoreaux Joseph Purdy	January 26, 2002	5.90
Arnold Visits Arnie: Arnold visits his cousin, Arnie, whose friends look remarkably familiar to Arnold's. Chocolate Boy: Chocolate Boy wants to give up chocolate.
89	13	"Harold vs. Patty / Rich Guy"	Christine Kolosov	Michelle Lamoreaux Joseph Purdy	February 3, 2002	5.91
Harold vs. Patty: P.S. 118 is having an Arm Wrestling contest, but Harold get humiliated when he loses to Patty before the contest, so he asks Patty for some pointers on winning. Rich Guy: After Arnold saves the life of a rich man, the man invites Arnold and Grandpa Phil to his house. He tells Arnold that he wishes Arnold was the son he never had, but he really does have a son, but they share nothing in common.
90	14	"April Fool's Day"	Christine Kolosov & Donald A. Judge	Craig Bartlett, Michelle Lamoreaux, & Joseph Purdy	April 1, 2002	5.98
April Fool's Day: Arnold is sick and tired of everybody performing their April Fools jokes on him (especially Helga), so he tries one of his own, but it backfires when it temporarily blinds Helga.
91	15	"Gerald's Game / Fishing Trip"	Frank Weiss	Joseph Purdy Joseph Purdy & Steve Viksten	April 27, 2002	5.82
Gerald's Game: Gerald is involved with his new favorite game, which Arnold dislikes. Fishing Trip: Arnold, Gerald, Harold, Sid and Eugene go on a fishing trip with their fathers and Phil.
92	16	"Married"	Frank Weiss	Steve Viksten	May 11, 2002	5.96
Married: Rhonda uses a folding paper fortune teller to see who will marry who, and Arnold and Helga get paired up, causing them to both dream what life would be like married to each other.
93	17	"On the Lam / Family Man"	Christine Kolosov Frank Weiss	Jonathan Greenberg Steve Viksten	June 1, 2002	5.93
On the Lam: Stinky, Harold and Sid are on the run after they think they blew up the police station. Family Man: Mr. Hyunh has Arnold pretending to be his son for his new employer.
94	18	"The Racing Mule / Curly's Girl"	Christine Kolosov	Steve Viksten, Joseph Purdy, Craig Bartlett, & Michelle Lamoreaux Michelle Lamoreaux & Joseph Purdy	October 14, 2002	5.92
The Racing Mule: Mr. Hyunh, Oskar and Ernie buy a race horse, or so they think. Curly's Girl: Curly gets Rhonda to act like his girlfriend after something happens to Rhonda's mother's fur coat and he fixes it.
95-96	19-20	"The Journal"	Christine Kolosov	Craig Bartlett, Michelle Lamoreaux, & Joseph Purdy	November 11, 2002	5.99–5.100
The Journal: Arnold finds a journal describing the adventures of his parents in the jungle. Also, it contains a map telling where they had to go after they left him. Note: Last episode produced; originally designed as a cliffhanger as a lead-in to "The Jungle Movie", a theatrical feature that was cancelled and years later revived as a two-part television movie.[2] Note: This episode also exists in a full 47-minute version.
97	21	"Timberly Loves Arnold / Eugene, Eugene!"	Frank Weiss Christine Kolosov	Craig Bartlett Craig Bartlett & Michelle Lamoreaux	January 28, 2003	5.97
Timberly Loves Arnold: Arnold does something for Timberly, causing Timberly to have a crush on Arnold. She makes Lila start to like Arnold because he has been helping Timberly. Eugene, Eugene!: Eugene gets the lead role in the school musical "Eugene, Eugene". But the play director cuts the parts that Eugene is a hero, and makes the parts look like he is a loser.
98	22	"Ghost Bride / Gerald vs. Jamie O"	Christine Kolosov	Steve Viksten Michelle Lamoreaux	November 11, 2003	5.88
Ghost Bride: Gerald tells the story of the Ghost Bride, Cynthia Snell, and how she murdered her intended after he left her waiting at the altar and married her sister. She also happens to be buried in the cemetery near the gang's neighborhood, and supposedly comes back from the dead every anniversary of the murders. Arnold, Gerald, Eugene, Harold, Sid, and Stinky are scared twice by Helga and Curly, each pretending to be the Ghost Bride. At the end, the real Cynthia Snell finally appears. Gerald vs. Jamie O: Gerald gets jealous because he thinks Jamie O. is trying to steal the girl he likes, when, actually, the girl likes Jamie O.
99	23	"A Day in the Life of a Classroom / Big Bob's Crisis"	Frank Weiss	Joseph Purdy Joseph Purdy & Michelle Lamoreaux	November 15, 2003	5.95
A Day in the Life of a Classroom: After Mr. Simmons wins an award, a TV station does a documentary on how he teaches. Big Bob's Crisis: After Big Bob has a heart attack, he tries to become nicer.
100	24	"Grandpa's Packard / Phoebe's Little Problem"	Frank Weiss Christine Kolosov	Craig Bartlett & Joseph Purdy Michelle Lamoreaux & Steve Viksten	June 8, 2004	5.94
Grandpa's Packard: Grandpa's Packard is stolen from an antique car show. Phoebe's Little Problem: Phoebe gets embarrassed after she farts into a microphone in front of a big audience.

Television film (2017)

Title	Original air date
"Hey Arnold!: The Jungle Movie"	November 23, 2017
According to a Nickelodeon press release the film will be "A two-part animated TV movie written and executive produced by the series’ original creator Craig Bartlett, will pick up where the original series ended and resolve unanswered questions and plotlines, including Arnold finally getting answers about the whereabouts of his missing parents."[3]

References

1. "Hey Arnold! Episodes". TVGuide.com. CBS Interactive Inc. Retrieved 19 December 2013.
2. Los Angeles Times (23 November 2015). "Nickelodeon developing 'Hey Arnold!' TV movie". latimes.com. Retrieved 2 January 2016.
3. Swift, Andy. "Hey Arnold: The Jungle Movie Greenlit at Nickelodeon, Series Creator Confirms". TVLine.com. Retrieved 7 March 2016.