As fifteen children at a summer camp enjoy their carefree vacation together, they stumble upon a small cave near the beach. The group finds a mysterious room deep within its caverns, where they meet a strange man who calls himself Kokopelli. The man invites the children to play a game that involves taking turns controlling a robot to protect the Earth against aliens. Thinking it might be an interesting computer game, all but one of the children sign a contract agreeing to play. Later that day, the giant robot appears in person and the children are teleported into its cockpit, where they find Kokopelli, who pilots a fight against a similar robotic creature that has appeared nearby. After winning the battle, Kokopelli tries to apologize but is interrupted as the children are teleported back