"And now it's time for the greatest show on Earth!"  Not  if you're one of the contestants - strapped inside an ostrich-like mecha within the deep caverns of a deserted island that's slowly sinking.  Your sole purpose is to get out alive, but that won't be so easy - what with all booby traps, unstable rock, and steadily rising water. In the meantime, your predicament is being broadcast to  thousands of blood-hungery TV viewers around the world. Get ready to die!" the announcer screams, and with that the show begins.