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.
Willis asks Kimberly to help a classmate who lacks sensitivity to try and get a girl at school. However, the plan backfires when he falls in love with Kimberly.
Drummond and Mr. Ramsey learn the truth about Mr. Horton, the seemingly friendly bicycle shop owner with a very sinister side. It soon becomes a race against time to get details out of Arnold after learning that Dudley is about to become Mr. Horton's latest victim.
Tired of being treated like a child, Kimberly and a friend plan a ski weekend in which they will be staying with guys. She has a lot of explaining to do when Drummond and Willis drop by the lodge to surprise her.
Arnold and Sam learn that their new friend, a street performer, has epilepsy. Their emotions become a ball of confusion and misconception ... until someone very close to them (namely, Pearl) shares her experiences with the disorder.