Arnold accidentally knocks out a bully named Harold during a baseball game, and Harold gives Arnold 24 hours to live before he beats him to a pulp.

Arnold and Gerald decide to take the bus a bit too far and miss the play that they are characters in, since Helga is in charge of it. Later, when Eugene's bicycle is ruined thanks to Arnold, he decides to take him out for a day of fun.

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 can't bear to face the world bareheaded. Where can it be? Helga's not talking.

Lipstick, hairspray, nail polish-Rhonda's birthday party is an all-girl affair, and that's why Helga isn't invited. But she's plotting revenge, and it's gonna make 'em run like cheap mascara.

In '6th Grade Girls', Arnold and Gerald are invited to a school dance by two girls to make their boyfriends jealous. / In 'The Baseball', Mickey Kalin is Arnold's favorite player and is going to retire and Arnold wants to go to his last game.

With fourteen beautiful inches of powdery snow, a blizzard has transformed Arnold's city into a winter play-land. But with the list of chores Grandpa has handed him, it could be July before he gets to play in it.

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.

When Arnold receives Mr. Hyunh's name in the boarding house's annual Secret Santa draw, 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. Meanwhile, Helga agonizes over what would make the perfect present for Arnold.

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.

The first episode is "Spelling Bee", It's time to crown the spelling champ of the whole city, and P.S. 118 has two contenders for the $500 prize. In one corner, Arnold. In the other, Helga. The second "Pigeon Man", Arnold's prized pigeon takes ill, and only one person can help-the creepy recluse Pigeon Man. But when Arnold visits him in his rooftop roost he find they're birds of a feather.

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 a strange subterranean world.

False Alarm: Eugene is accused of pulling the fire alarm at school. Arnold try to convince other jurors that Eugene can be innocent. World Records: Arnold want to be into a book records.

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 gets a visit from his French pen pal Cecille, who behind her French accent, seems strangely familiar.