He's a Bully, Charlie Brown

A bully cheats Rerun Van Pelt out of a bag of marbles that belonged to his grandfather. Charlie Brown decides to learn the game and win back Rerun's bag of marbles. Meanwhile, back at home, Peppermint Patty is convinced that Charlie Brown is in love with her best friend Marcie. The fact that they are both at a Summer camp together while she is stuck in Summer school only exasperates the problem.