Linus and Lucy's younger brother Rerun wants a dog for Christmas, and Snoopy's brother Spike may be the answer.
The story begins at a big football game where Snoopy wins a game from Peppermint Patty's team. That night, Snoopy gets out a radio, learns some 80's dance moves, and becomes Flashbeagle.
Charlie Brown and a few of his friends attend a camp, and there they meet Joe Agate, a lying bully who offers to teach kids the game of Marbles without telling them it's for keep. Then he takes their marbles for good. When Rerun is tricked and gets his marbles taken, Charlie Brown must use his own marbles to help get the other kids their marbles back. The only problem is, Charlie Brown doesn't know how to play.
