The adventures of a daydreaming, jazz-loving, football-headed 9-year-old, who lives in a boarding house with his grandparents and some eccentric boarders, encounters life in the city with his best friend Gerald, a loofah-haired kid, who is the keeper of the urban tales and coolest kid in class; and Helga, who torments him, but loves him secretly.
Rhonda has a party and only invites the cool kids. Arnold attends, but realises her party is only for snobs. He leaves and has his own party with his buddies and eventually Rhonda realises that 'geek' is cooler than 'cool.'
After Rhonda and Patty get in a fight, both of their parents send them to polishing school, but it appears that Patty will graduate before Rhonda.
Rhonda's family goes broke and they move into the boarding house.
Curly gets Rhonda to act like his girlfriend after something happens to Rhonda's Mothers' fur coat.
Rhonda fails her eye test and has to wear glasses, a major fashion no no in her books. Immediately, she is labelled a geek and hangs out with the geeky kids.
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.
Arnold has to do a book report, and he decides to do it on his favorite author, Agitha Cawfield, but he sees her bad side when she is very crabby & rude to him.
Eugene is gutted when he finds out that his favourite movie star doesn't do his own stunts. Arnold tries to cheer his mate up.
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.
While Grandpa, Arnold, Mr. Johanssen, and Gerald go on a trip, Grandpa tells Arnold that he single-handedly won World War 1, and Gerald doesn't understand why his Father was only a paper-pusher in Vietnam.
Harold is invited to Rhonda's party, though he does not want to go as he thinks nobody will dance with him. While there, he dances with and befriends the female bully, Big Patty, who also had nobody to dance with. The two spend the next day together hanging out, much to the teasing of Stinky and Sid, who begin to tease him by saying he has a crush on her. They already tease Big Patty for being "big and dumb", which upsets Harold.
When a psychologist comes to PS 118, she notices Helga's behavior, so she calls Helga for a session. Reluctantly, she goes, and tells this psychologist about her life and how she behaved this way... Eventually, Helga ends up telling the psychologist her feelings about Arnold and gains a trust with Dr. Bliss.
Mr. Hyunh has Arnold pretending to be his son for his new employer.
Ernie starts dating a tall model, but she doesn't want to continue dating him because of his height.
After Mr. Simmons wins an award, a TV station does a documentary on how he teaches.
Helga and Arnold locked in a greenhouse together for 24 hours? Now THERE'S a science fair project! They should both get a great grade on it - if they don't kill each other first.
Miriam decides to visit her mum because Big Bob and Helga are on holiday at the same time. What that means is that father and daughter must spend some 'quantity time' together. Problem is that both of them just seem to rub each other up the wrong way.
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.
Arnold has to hang around with his boring and odd cousin, Arnie, but Arnold starts to get angry when Lila and Arnie fall in love with each other.
Olga gets into a 'Big Sis' program, but her 'Lil' Sis' is Lila.
Arnold gets a date with both Ruth (The girl he likes) and Cecile (his pen pal, who's actually Helga in disguise), but later the real Cecile shows up.
Arnold convinces the gang to go to Elk Island, where, unknown to them, two men are plotting a counterfeit coin scheme.
Harold is suspended and will do anything to get back into school.
When the legendary musical duo of Dino and Don Spumoni split up, they each move into the boarding house (unknown to each other). So it's up to Arnold and Gerald to restore harmony...
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.
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