Arnold finds out that several athletes at school are using anabolic steroids, so he goes undercover to expose the full story.
Arnold and Lisa get stuck working together on a school assignment, and get locked in their school's darkroom. This leads to the two of them coming to an understanding about their adversarial relationship.
Willis gets the sister of one of his old girlfriends to go out with Arnold by giving her concert tickets. When Arnold finds out he is angry at what Willis did, but turns out the girl likes Arnold for real.
Sam gets into a fight at Hamburger Hanger with a kid who constantly picks on him. Sam later discovers the bully is a foster child and is very jealous of what Sam has.
Arnold gets blamed when food starts disappearing from the house, but he soon discovers that Kimberly, who has developed bulimia, is the culprit.
Arnold pulls a prank at the local burger place in order to get into a club, but his prank causes a mentally challenged worker to get fired, so Arnold tries to make things right.
Arnold and his friends find out that a racist group will be speaking on campus, so they decide to interrupt their assembly by throwing rotten food at them. When Mr. Drummond find out, he objects to Arnold's behavior.
Arnold tries to learn the saxophone to impress a girl, but is so bad that his friends try to kick him out of their group.
Kareem Abdul-Jabbar returns as Arnold's teacher and has Arnold take over teaching the class for one day. Arnold isn't thrilled about the assignment at first, but after reading the assigned book, he gets excited.
Mr. Drummond and Maggie are too busy to spend time together, which has Sam worried that their marriage may be in trouble. So he and Arnold put together a romantic evening for the two of them.
Conclusion. Sam manages to call home and tell Arnold where he is.
Arnold and Sam befriend a street performer, much to Mr. Drummond's chagrin. When they try to tell her they can't hang out with her anymore, she begins having an epileptic seizure.
Arnold is pressured to drink by an alcoholic classmate. His parents find out and lay down the law, but when his friend is caught with some of Mr. Drummond's liquor, Arnold is accused of using it.
Arnold's toy rocket crash lands at the Russian embassy and nearly causes an international incident.
Sam becomes friends with another kid in the building, but is horrified when he finds out the kid is actually a girl. Mr. Drummond convinces him that being friends with a girl isn't so bad.
Maggie and Sam surprise Mr. Drummond for his birthday by having Kimberly return from France to visit him. She brings a present of her own - the Drummond family tree.
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