When Arnold has a daydream while playing baseball, Harold tells him he has 24 hours left to live (this pilot was re-made into the episode called "24 Hours to Live")

Not looking forward to performing in Helga's "The Four Food Groups" musical, Arnold and Gerald decide to take the bus a few stops too many, but end up stuck downtown.

Helga is annoyed when Rhonda doesn't invite her to her slumber party - everybody assumes that "girly" parties aren't Helga's style. So, Helga is determined to prove her wrong, and gets a makeover.

Grandpa, Arnold, and Gerald are all going on an old fashioned camping trip... until Big Bob, Helga, and Phoebe show up with luxurious camping equipment.

While Helga tries to find the perfect gift for Arnold, Arnold tries to find Mr Hyunh's long-lost daughter.

Arnold and the gang play on a basketball team, but their coach tells them to throw the ball to one person, his son, Tucker.

Arnold and the gang set out on a quest to find the hidden treasure of the mysterious "Wheezin' Ed" on Elk Island.

When Arnold's pigeon gets sick, he takes it to "Pigeon Man", a person surrounded by pigeons who lives in a rooftop.

Eugene is accused of pulling the fire alarm. In the school court, the jury thinks Eugene is guilty except for Arnold, who believes there is a shadow of a doubt.

The kids try to get in the book of world records so much that they would do anything, including most people on a one-person bike and the longest game of Crack-The-Whip.

Arnold has a magic show and he makes a disappearing act and uses Helga as the person disappearing. Helga decides to play a trick and literally disappears. She bumps into a pole and has a dream on how the world would have been if she's gone.

Arnold and the gang must stop Big Bob from chopping down the oldest tree in town.

When the kids make their new teacher, Mr. Simmons, quit his job, the replacement makes them realize what they lost.

Helga drinks a potion to lose all feelings for Arnold.

Gerald's secret is revealed; he doesn't know how to ride a bike, so Arnold teaches him how.

Arnold and Gerald compete against Helga for the school newspaper.

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.

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.

After Arnold accidentally kills Eugene's fish with a yo-yo, he must do something to make up for it.

An organ grinder's monkey kisses Helga, who's convinced she has caught 'monkeynucleosis'.

Arnold and Gerald do a spot of fishing, determined to catch the pond's biggest fish, the legendary "Big Caesar".

Gerald and Arnold get on the case when Timberly loses her Barney-esque doll.

The new girl is teased at school by Helga and the other girls, but she's soon accepted by everyone.

After Arnold saves Sid from an injury, Sid devotes himself to paying Arnold back with unending kindness.

Arnold and Gerald bunk off school, but their day is ruined by their fear of being found out.

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.

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.

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, 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.

Gerald becomes an entrepreneur out of selling watches until the market becomes saturated.

Rhonda and Nadine fall out over working on a project at school, leaving Arnold to work with both of them separately.

Arnold and Gerald send the neighborhood alien crazy as they broadcast a mock Halloween radio show.

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.

Helga's mother tries to let her and her father, Bob, bond.

Arnold follows in his Grandpa's footsteps and competes in the annual block party eating contest. After much munching Old Football Head goes stomach to stomach with eating legend Seymour 'The Disposal'.

Rhonda gets glasses and finds out what it is like to be a "Geek".

Helga uses Stinky as her boyfriend to try to make Arnold jealous.

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.

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 runs away from his Bar Mitzvah, thinking he will retain his childhood this way.

Arnold and his friends get Coach Wittenberg to be their new bowling coach.

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.

After finding out that his idol is a haughty, primped actor, Eugene sets out to become bad.

Helga and Arnold fall asleep and have their own "parody/dream" of the opera Carmen.

Arnold and a descendant of his grandpa's arch enemy, Rex Smythe-Higgins, compete in a boat race.

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.

After creating an idea for a parade float, Arnold is confident of it showing up in a parade.

A lounge singer moves into the Sunset Arms after renouncing his songwriter, who also moves there.

Gerald's voice is deepened after having his tonsils out, just a few days before the school recital.

Patty challenges Helga to a fight after Helga gets on her last nerves by picking on her once too many.

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.

Phoebe wins a chance to meet her favorite singer, only to find out that he doesn't write or sing his own songs.

After the results of an aptitude test are announced, Harold gains self-confidence and Helga feels dumber.

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.

Harold is invited to Rhonda's party and befriends the female bully, Big Patty.

Helga tells jokes about her classmates, who take offense to it.

The town is flooded and Arnold's class is trapped in the school.

P.S. 118 is holding a Spelling Bee, and Helga wants to win one trophy to get out of Olga's shadow, but Pheobe has to back out of the competition for Helga to make it.

Arnold snaps at school after Helga tries his patience once too often.

The school is doing the play 'Romeo and Juliet'. Arnold lands the role as Romeo so Helga will do anything to beat out other girls to get the part of Juliet, so that she can kiss Arnold in the final scene.

The school is doing the play "Romeo and Juliet". Arnold lands the role as Romeo so Helga will do anything to beat out other girls to get the part of Juliet, so that she can kiss Arnold in the final scene.

After Bob pops his spine, Miriam runs Big Bob's Beepers. She gets in over her head and forgets about her family.

Helga inscribes her name in her Arnold locket.

Harold is suspended and will do anything to get back into school.

Arnold asks Grandpa 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.

When Arnold gives the superhero Monkeyman a taste of normal life, he's far too busy to bother helping the weak and downtrodden.

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.

Helga decides to act like Lila so Arnold will like her..

Mr. Green runs for city council.

Sid thinks Stinky is a vampire.

Olga gets into a "Big Sis" program, but her "Lil' Sis" is Lila.

Arnold, Sid and Gerald find a bag filled with money, but when Arnold loses it, everyone thinks he stole it. (Didn't I see this before? Probably in a similar story on a Doug episode entitled ""Doug's in the Money"")

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?

The kids must face two bullies when a new kid, Ludwig, returns and wants the vacant lot for himself.

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.

Sid becomes obsessed with cleanliness.

Ernie starts dating a tall model, but she doesn't want to continue dating him because of his height.

Arnold asks Grandpa 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.

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 thinks he's stuck on an island. Oscar 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.

Arnold gets stuck in a tree with Harold and Eugene.

Rhonda's family goes broke and they move into the boarding house.

Helga gets amnesia, and Arnold starts acting nice to her.

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.

Arnold visits his cousin Arnie, whose friends look remarkably familiar to Anrold's

Chocolate Boy wants to give up chocolate.

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.

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.

Arnold is sick and tired of everybody performing their April Fool jokes on him (escpecially Helga), so he tries one of his own, but it backfires when it temporarily blinds Helga.

Arnold is sick and tired of everybody preforming their April Fool jokes on him (escpecially Helga), so he tries one of his own, but it backfires when it temporarily blinds Helga.

Gerald is involved with his new favorite game which Arnold dislikes.

Arnold, Gerald, Harold, Sid and Eugene go on a fishing trip with their fathers and Phil.

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.

Stinky, Harold, and Sid are on the run after they think they blew up a police station.

Mr. Hyunh has Arnold pretending to be his son for his new employer.

When corrupt developer Schek threatens to buy the run-down urban neighborhood where a fourth grader Arnold lives, and now Arnold and his cool-as-ice best pal Gerald are on the biggest mission ever to save their neighborhood as they go up against a powerful industrialist who invades the city and buys everything in sight so he can knock it down and erect a huge "mall-plex." It's up to Arnold and Gerald to save their neighborhood before it's too late and they'll have to move somewhere else. But with the help of of a superhero and a mysterious deep-voiced stranger, Arnold and Gerald will need to recover a crucial document in order to save their beloved neighborhood at all costs.

Mr. Hyunh, Oskar, and Ernie purchase a race horse, or so they think.

Curly gets Rhonda to act like his girlfriend after something happens to Rhonda's mother's fur coat and he fixes it.

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.

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.

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 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.

Gerald's Ghost Bride story inspires the other boys to venture into the cemetery at night, but they may have bit off more than they could chew, because they're hunted down by two different Ghost Brides.

Gerald gets jealous because he thinks Jamie O. is trying to steal the girl he likes, when, actually, the girl likes Jamie O.

After Mr. Simmons wins an award, a TV station does a documentary on how he teaches.

After Big Bob has a heart attack, he tries to become nicer.

Phoebe gets embarrassed after she "passes gas" in front of a microphone.

Grandpa's Packard is stolen from an antique car show.

Picking up where Hey Arnold! left off, this tells the story of what happened to Arnold's parents.