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")

Una ola de calor azota la ciudad, y los chicos deben pasar por todas las torturas de la canícula, incluyendo soportar al heladero y sus precios elevados.

Es la primera nevada del año y Arnold sólo desea jugar, hasta que descubre que debe ayudar en los quehaceres de la casa.

Helga se aseguró que Arnold no le dirija una palabra a Ruth durante el festival del queso.

Los chicos limpian un terreno baldío para poder jugar béisbol, hasta que llegan los adultos y se toman el lugar para ellos.

Arnold acepta un paquete dirigido al misterioso huésped, el «Señor Smith», un paquete que todos quieren abrir.

Oskar es botado de la casa por Suzie y se va a vivir con Arnold, razón suficiente para que Arnold intente reconciliarlos.

Helga intenta encontrar el regalo perfecto para Arnold, mientras Arnold intenta ubicar a la hija del Sr. Hyunh, a quién no ve en mucho años desde el final de la guerra.

El entrenador de Básquetbol no tiene una buena visión sobre como llevar al equipo, ya que la única técnica consiste en pasarle el balón a Tucker.

Arnold comienza a pasar mucho tiempo con un chico llamado Frankie, en quien Gerald no confía.

Luego de ver una película, Arnold, Gerald y sus amigos pierden el último bus, y se ven obligados a tomar el subterráneo para volver a casa. Desafortunadamente, el subterráneo sufre una avería...

Los chicos viajan a la Isla del Alce en busca del tesoro del Jadeante Ed, donde unos ladrones están falsificando centavos.

An older cool guy befriends Arnold, but Arnold realizes that he is really a shoplifter.

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.

Arnold and Gerald must turn off all the lights in the city if they want to see Sally's Comet.

Arnold loses Grandpa's watch inside the sewers, so he must retrieve from The Sewer King.

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 hits Harold with a baseball, so Harold promises Arnold that he'll beat him the next day.

Helga, bajo los efectos del gas del dentista, confiesa su amor por Arnold, lo que lleva a situaciones embarazosas y cómicas.

Harold roba un jamón y debe trabajar para el carnicero para compensarlo, aprendiendo sobre responsabilidad y honestidad.

Arnold se siente culpable por avergonzar a Iggy accidentalmente y trata de enmendar su error, enfrentando las consecuencias de sus acciones.

Sid tiene que trabajar con Lorenzo en un proyecto para la escuela, pero luego de ver la habitación de Lorenzo, Sid se avergüenza de la suya propia, por lo que toma «prestada» la habitación de Arnold para hacerle creer a Lorenzo que es la de él.

Stinky es elegido como el chico «Yahoo» para un comercial y de pronto está en la cima del mundo, hasta que se entera que lo escogieron porque es demasiado tonto.

Curly ha estado contando los días para ser monitor de balones, pero cuando el Señor Simmons escoge a Sid, Curly se encierra en la oficina del director con todos los balones de la escuela.

A roller coaster breaks down while Eugene and Arnold are at the top of its tallest drop.

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

Arnold finds out Iggy wears bunny pajamas with feet in them, and Arnold accidentially spills the beans to Sid and Stinky, ruining Iggy's cool image.

A. All the kids are paired with adults with interesting jobs except Arnold, who is forced to spend time with the Jolly Olly, the Ice Cream Man.

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

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.

Helga, lost in a love reverie, writes 'Arnold loves Helga' on a wall, but changes the name to 'Lila' when the kids approach. Lila thinks that Arnold loves her until he explains the mistake. Then he falls for Lila and she is forced to break up with him.

The kids compete in a grand prix race against each other.

Arnold and Helga both think they are having the worst Thanksgivings ever. Arnold's Family are celebrating President's Day, and Olga is at the Pataki house. When Arnold and Helga go to Mr. Simmons' house, they discover he has a obnoxious family, so they think their families aren't so bad after all.

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

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

Cuando el desarrollador corrupto Schek amenaza con comprar el barrio urbano en ruinas donde vive un estudiante de cuarto grado, Arnold, y ahora Arnold y su mejor amigo Gerald están en la misión más grande para salvar su vecindario mientras se enfrentan a un poderoso industrial que invade la ciudad y compra todo lo que tiene a la vista para derribarla y erigir un enorme "centro comercial". Depende de Arnold y Gerald salvar su vecindario antes de que sea demasiado tarde y tengan que mudarse a otro lugar. Pero con la ayuda de un superhéroe y un misterioso extraño de voz profunda, Arnold y Gerald necesitarán recuperar un documento crucial para salvar su amado vecindario a toda costa.

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.

Harold, Sid, and Stinky all moon Principal Wartz, but Arnold is blamed, even though he was just an innocent bystander.

Helga's sister Olga comes home for spring break and becomes a classroom aid in Helga's class, much to Helga's chagrin.

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.

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.

After losing Eugene's birthday party invitations, Arnold feels obliged to throw him another party, but it doesn't work out.

Stinky grows a huge pumpkin to enter in a city competition.

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

Arnold finds out that Oskar is illiterate and tries to teach him to read.

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 is promoted to the sixth grade, but realizes that her new so-called "friends" are just using her to do their homework.

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.

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.

Helga tries to separate Arnold from Lila while at the annual Cheese Fair.

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.

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.

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.

Helga becomes a model, but she quits after she gets irritated at everyone dressing like her.

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.

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.

Rhonda attends a finishing school, but is far from impressive with her stroppy attitude, and seeks help from fellow student Big Patty.

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.

Oskar has to take care of his infant cousin-in-law (also named Oskar), while both Susie and her cousin are gone.

Phil's twin sister comes for a visit, bringing along an unsettled conflict between them.

Arnold and the gang are part of a synchronized swimming team led by Coach Wittenburg.

After eating pork rinds, Helga sleepwalks, uttering her secret about Arnold as she does so.

Arnold, Grandpa, Grandma, Ernie, and Mr. Hyunh compete on a game show against a "perfect" family from PS 119

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.

Arnold and Gerald try to prove superstitions are fictitious, only for it all to backfire on them.

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.

Helga confides in the school psychiatrist about her social life, family life, and her love for Arnold.

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".

Arnold encuentra el diario de su padre, en el cual relata los viajes que realizó. La serie termina inconclusa, debido a que al final del capítulo se puede ver que encuentran un mapa diciendo a donde sería su último viaje, dejando a conclusión del televidente si podrá o no encontrar a sus padres

Un canal de TV escoge la clase del Señor Simmons para filmar un documental.

Recogiendo donde acabó ¡Oye, Arnold!, cuenta la historia de lo que les sucedió a los padres de Arnold.

Arnold, Harold y Eugene quedan atrapados en un árbol, y deben valerse del niño chocolate para salir de ahí.

Helga pierde la memoria y Arnold actúa amable con ella, pero cuando la recupera, Helga finge que aún tiene amnesia para que Arnold siga siendo amable con ella.

Arnold visita a su primo Arnie, y nota ciertas similitudes entre los amigos de Arnie y los suyos.

Harold se siente humillado cuando es vencido por Patty en vencidas.

Arnold le hace una broma a Helga, pero al dejarla ciega, Arnold actúa como sus ojos.

Gerald está involucrado en su nuevo juego favorito, que a Arnold no le gusta.

Rhonda usa una corona de papel para predecir quién se casará con quién, y cuando Helga es emparejada con Arnold, ambos tienen diferentes sueños sobre como serían sus vidas si estuvieran casados, obviamente según sus propias expectativas: Helga felizmente casada con Arnold e incluso siendo la Presidente mientras Lila vive en desgracia y para Arnold una pesadilla de una boda forzada con Helga y viviendo infeliz a la sombra del Clan Pataki.

Harold, Sid y Stinky se dan a la fuga luego de que creen que volaron la jefatura de policía, aunque la simple lógica dice quien la demolió.

Ernie, Oskar y el Sr. Hyunh compran una mula de carreras, y usan a Arnold como jockey.

Arnold encuentra el diario de su padre, en el cual relata los viajes que realizó. La serie termina inconclusa, debido a que al final del capítulo se puede ver que encuentran un mapa diciendo a donde sería su último viaje, dejando a conclusión del televidente si podrá o no encontrar a sus padres

Arnold convence a Gerald de que Timberly los acompañe al juego, y entonces Timberly cree que ella y Arnold son novios.

Gerald relata la leyenda urbana de "La Novia Fantasma", Helga los espanta disfrazándose del espectro, pero habrá alguien que si los hará reventar de histeria.

Phoebe pasa la vergüenza de su vida cuando deja «pasar un gas» enfrente de un micrófono, aunque hay quien le hará sombra en cuanto a vergüenza.

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.

Arnold, cabeza de balón, es un chico vivaz, que adora su camisa y jugar al béisbol. La forma de su cabeza, no lo hace más o menos especial, su verdadero encanto está en su manera de ver la vida y las experiencias que debe afront

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.