Fat Albert and the Cosby Kids come to life and step out of their animated, inner-city Philadelphia world.An obese boy named Fat Albert and his friends Rudy, Mushmouth, Bill, Dumb Donald, Russell, and Weird Harold, pulls into trouble when they "fall" out of their TV world into the real world, where Fat Albert tries to help a young girl, Doris, make friends. However, the simple life of the group is interrupted when Fat Albert falls for Doris' older sister, Lauri, sparking his friends to worry that their leader may never want to return to his cartoon world again.