Kelly reunites with Colin and spends all her time getting high. The couple becomes consumed by its habit, especially when supplies run low. Valerie realizes that Kelly is using drugs, but has difficulty convincing everyone else. During a jog, Susan breaks down in tears after she and Brandon pass the scene of a hit-and-run. She reveals that her older sister was struck by a car and killed while jogging with Susan. Donna's concern for Joe's health grows when he intensifies his training sessions. Brandon has a talk with Joe, and is angry when Susan wants to run a story about his condition. Susan fears that Joe's life could be in danger, while Brandon doesn't want rumors to affect Joe's chances at a pro career. Joe nearly collapses with an irregular heartbeat while running the stadium steps. Clare challenges Steve to a race after he belittles her new sports car. A cop pulls them over, and they must attend traffic school. A fellow student, impressed by their bickering, asks Steve and Clare t