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. B...