Charlie and Shermy, disillusioned by their continued defeat, see Snoopy arm-wrestling with the boys. They realize that the boys might get even with an arm wrestling game, with "The Masked Marvel" (Snoopy) as their champion. Snoopy goes into training, eating the camp's awful food, doing exercises, and drinking a nutritious and noxious concoction. In the contest, Snoopy goes up against Lucy. They both get sweaty and tired in the match, which ends when Snoopy kisses Lucy. He pins her hand; but she says that kissing her was a foul, and she is the winner.