A masked killer targets six college kids responsible for a prank gone wrong three years earlier and who are currently throwing a large New Year's Eve costume party aboard a moving train.

Three robbers hide a stolen jewel inside a stuffed animal at one of the midway games in an amusement park. When Jack—a teen with a part-time summer job in the park—his best friend David and two girls hang out at the park, they get mixed up in the robbers' scheme to take back their jewel.