Arnold and Willis become hostages during a bank robbery by two experienced criminals.

After Arnold buys a toy train that doesn't work, he takes the owner of the store, who refuses to refund his money, to small claims court.

When Adelaide goes away, Drummond hires a temporary housekeeper to take her place. With the new housekeeper, Arnold soon realizes that she reminds him a lot of his mom and tries to arrange it so that she and Drummond fall in love.

Everyone is planning a huge surprise party for Drummond on his 50th birthday. But the real surprise is a very tragic one: On his way home, Drummond is critically injured in an accident caused by a drunk driver.

A misunderstanding with a visiting friend leads Drummond, Arnold, and Willis to believe that Kimberly is pregnant.

When he sees that Arnold is heartbroken after not making his Pee Wee league football team, Drummond secretly meets with the coach and agrees to buy the team new uniforms in exchange for Arnold being given a spot on the team.

With his grades down, Drummond forbids Willis to see his new girlfriend, Charlene. However, a love-struck Willis is determined to see her, even if means doing it behind Drummond's back.

When Arnold finds out that he will only grow to be 5 foot tall, he becomes very depressed. To make him feel better, Drummond introduces him to a friend's daughter who is very upbeat despite being confined to a wheelchair.

Arnold befriends the doorman who asks him for a $100 loan so he can bet it on a horse race.

Mr. Drummond worries that Willis's newfound Afrocentric attitudes are dividing the family.

Arnold has had enough of Susie, his pesky, know-it-all new neighbor, and chooses not to invite her to his birthday party, unknowing that she has a terrible secret in her life.

With a magazine reporter and Ed "Too Tall" Jones coming over to the house, Arnold decides to show off his talents by putting on a magic show. He plays a silly trick on everyone that leaves him out on the balcony ledge, afraid to move.

After getting a D in history, Arnold is forced to stay home from a hockey game to study. While at home, he and Drummond meet Milos, a Czech immigrant who is going to night school to try and become a US citizen.

Worried that his foster father's unemployed status will send him to another foster home, Dudley runs away and hides in Arnold's room in hopes that Arnold can convince Drummond to adopt him too.