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.
Arnold enlists a hustler to help him conceal a poor grade from Drummond, but the ruse becomes increasingly tricky to maintain.
Arnold gets blamed when food starts disappearing from the house, but he soon discovers that Kimberly, who has developed bulimia, is the culprit.
Sam manages to get a popular children's show host for his birthday party, but is disappointed when his friends are more interested in the guest than in him.
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.
Arnold hopes to become a photojournalist and ends up getting a job at a newspaper, but he becomes disillusioned when he's asked to run errands instead of taking pictures.
Willis has a hard time adjusting to college, so he decides to drop out. However, he changes his mind when he finds out he's not the only one having trouble adjusting.
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.
A tough guy wants Arnold to take care of his girlfriend while he is away, but the girl develops feelings for Arnold.
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.
Mr. Drummond goes undercover at his company to find out how his employees really feel about working there.
Mr. Drummond takes Sam and Arnold camping, but is unable to compete with Sam's more-experienced dad.
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.
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.
Sam's scout troop is asked to work with a bunch of senior citizens on projects, but Sam's assigned senior citizen calls Sam a brat and refuses to help, so Sam has to put together a model airplane by himself.
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