The daily life of Arnold--a fourth-grader with a wild imagination, street smarts and a head shaped like a football.
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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.
When Arnold accidentally ruins Eugene's new bike, he takes Eugene out on a day of fun, thinking that "every geek deserves his day".
When Helga loses her pink book, full of love poems about Arnold on the bus, it ends up in Arnold's hands. Now Helga must get it back before Arnold figures out who wrote the poems.
The kids are really looking forward to their field trip to the aquarium - especially when they remember the scary Lock Jaw from their last trip. But, when they get there, they see that Lock Jaw isn't really that scary. Arnold notices how neglected the old turtle looks, and returns later with Grandma to set it free.
An obsessed Helga steals Arnold's hat to complete her shrine to Arnold, which is hidden in the back of her closet. But, she notices how miserable Arnold is without his hat, and decides to give it back to him.
Arnold's hat lands on the stoop of "Stoop Kid," - a bully who has lived his whole life on his stoop, and is highly protective of it. But, when it's Arnold's fault that Stoop Kid becomes the joke of the city, he must help Stoop Kid face his biggest fear - leaving his stoop for the first time.
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.
Arnold is asked by his Grandma to help save an old building, and then asked by Ernie to help knock the building down! Who will Arnold decide to go along with? How can he get out of this tricky situation?
Two girls from the sixth grade who are tired of the way that their boyfriends treat them, decide to take Arnold and Gerald to the school dance, but only to make their boyfriends jealous.
Arnold's favorite baseball player is playing his last game, so he decides to go and see his last game. The only problem is that he winds up with terrible seats.
Arnold has a really bad day - the city is suffering from a heatwave, and whatever he does, Arnold just can't seem to get cool.
Snow hits the city and Arnold can't wait to get out and have some fun... but wait, there's chores to be done... and when there done Arnold has the time of his life playing Hockey with the "crew."
At the Annual Cheese Fair, Helga tries her best to keep Arnold well away from Ruth - a girl who Arnold has a crush on.
Arnold and friends decide to clear out a vacant lot to play baseball on, but the adults take over it, and use it for their own reasons.
Arnold attempts to do something that no other kid has done before - completing the entire list of a kid's perfect Saturday! But, unfortunately, things don't go quite to plan.
When the kids complain of being bored, Grandpa tells the story of the Haunted Train. So, the kids decide to go and see if the train exists for themselves.
When Arnold gets mugged in the street, Grandma teaches him how to defend himself, but the training and fighting starts to get to his head.
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.
All of the boarders get very curious to what is inside the very personal Mr. Smith's package.
Oskar gets kicked out of Suzie's room when they get into an argument, so Arnold tries to get them back together when Oskar moves into Arnold's room.
While Helga tries to find the perfect gift for Arnold, Arnold tries to find Mr Hyunh's long-lost daughter.
Arnold has trouble with the basketball coach and his favored son.
An older cool guy befriends Arnold, but Arnold realizes that he is really a shoplifter.
Arnold and the gang have no choice but to take the subway home after dark.
Arnold and the gang set out on a quest to find the hidden treasure of the mysterious "Wheezin' Ed" on Elk Island.
Arnold is given the assignment to tutor Torvald, the meanest, toughest kid in Arnold's math class, for the big math test on Friday.
Gerald goes to Arnold's place to meet the other residents.
Arnold and Helga compete on a Spelling Bee contest.
When Arnold's pigeon gets sick, he takes it to "Pigeon Man", a person surrounded by pigeons who lives in a rooftop.
Helga decides to give her talented sister Olga a taste of reality by changing her grade in her report card.
Arnold and Gerald must turn off all the lights in the city if they want to see Sally's Comet.
Arnold must find a way to recover his pig pet Abner after he runs away.
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.
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.
The cast behind this title
Spencer Klein
Arnold (voice)
Francesca Marie Smith
Helga Pataki (voice)
Jamil Walker Smith
Gerald Johanssen (voice)
Olivia Hack
Rhonda Wellington Lloyd (voice)
Anndi McAfee
Phoebe Heyerdahl (voice)
Justin Shenkarow
Harold Berman (voice)
Blake McIver Ewing
Eugene Horowitz (voice)
Dan Castellaneta
Grandpa Phil (voice)
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