Arnold and Gerald are cast as a banana and a strawberry in their school play which is written and directed by Helga. Arnold wrecks Eugene's brand new bike.
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Helga drops her journal full of love poems about Arnold into a pile of books. Arnold's class goes on a field trip to the aquarium where Arnold waits to see Lockjaw.
Arnold and Gerald are cast as a banana and a strawberry in their school play which is written and directed by Helga. / Arnold wrecks Eugene's brand new bike.
Helga tries to hide her disappointment at not being invited to Rhonda's makeover party. Arnold gets caught between his loyalty to Grandma and a promise to help his pal Ernie demolish an old theater.
Arnold and Gerald are invited to a school dance by Connie and Maria. Arnold and Gerald manage to scrape up enough money for cheap seats at the last baseball game of Mickey Kaline - Arnold's idol.
A record heatwave strikes the city, setting everyone on edge. Arnold wakes to find the city covered in snow and hears that school is closed for the day.
Arnold decides to get up the nerve to speak with the girl of his dreams, Ruth McDougal, at the annual cheese festival. Arnold and the gang clean up a vacant lot so that they can have a baseball field.
Arnold's best laid plans for the "ultimate Saturday" go up in smoke when he tries to complete all of his favorite things to do in one afternoon. On a boring summer night Grandpa tries to liven things up by telling a story about haunted Train Number 25.
Arnold learns the secrets of the martial arts from Grandma after getting held up for his bus pass. Grandpa takes Arnold and Gerald out to the woods to show them how to camp "the old fashioned way."
The boarders are all suspicious of the mysterious Mr. Smith who lives behind door 16. Oscar Kokoshka moves in with Arnold when his wife, Susie, throws him out of their apartment following another fight.
Arnold has trouble with the basketball coach and his favored son. Arnold becomes friend with "cool" Frankie G., but his new friend only succeeds in getting him into trouble.
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 convinces Arnold to allow him to spend the night at Arnold's house.
Arnold and Helga are chosen to represent the school in the city wide spelling bee. Arnold has serious plans for the $500 prize money, but Helga has other ideas. Arnold brings his sick pigeon to the mysterious Pigeon Man.
When Helga's older sister, Olga, comes home from college and gets all of her parents' attention, Helga plots to sabotage her sister's visit. Arnold and Gerald save up cereal box tops to get a telescope before the arrival of Salley's Comet.
Arnold's pet pig, Abner, escapes one night while Arnold is sleeping. When Arnold tries to bring Grandpa's pocket watch home from the repair shop, he accidentally drops it down a hole in the street, which leads him to strange subterranean world.
When Eugene is falsley accused of pulling a fire alarm, Arnold acts as Eugene's advocate before the student jury. When Arnold becomes fascinated with the Book of World Records, he and Gerald set out to set a world record of their own.
Arnold gives an amateur magic show behind the boarding house and, for his big number, makes Helga actually disappear. When Arnold accidentally beans Harold in a baseball game, the bully vows to "kill" him, and gives him 24 hours to live.
Arnold and Gerald get jobs working for Mrs. Vitello in her flower shop. For a science fair project, Helga and Arnold must study the effects of twenty-four hours of togetherness in Grandpa's dilapidated old greenhouse.
When Arnold draws Mr. Hyunh's name in the boarding house's Secret Santa, he decides to make it the most special Christmas ever for the lonely boarder and tries to reunite Mr. Hyunh with his long-lost daughter.