15 youngsters, 8 boys and 7 girls, are having fun at summer camp until they come to a grotto by the sea. When they enter the strange location, they discover a room full of computers and a guy named Kokopelli, who introduces himself as the owner. He claims to be working on a game with a massive robot built to protect the Earth from 15 possible extraterrestrial invasions. Kokopelli hasn't had a chance to test the game yet, so he convinces all but one of the youngsters to sign a contract for what he promises would be a delightful excursion. However, after the contracts are signed, things take a far darker turn.