The Astro Investigation and Defence Service (AIDS) sends their agents, Derek, Frank, Ozzy, and Barry to investigate the disappearance of the entire population of the town of Kaihoro. They find the town has been overrun by man-eating space aliens disguised as humans in blue shirts. Barry kills one of the aliens and is attacked by others. After Derek notifies Frank and Ozzy, he begins torturing Robert, an alien they caught earlier. Robert's screaming attracts a number of aliens in the area. Derek kills the would-be rescuers, but he is attacked by Robert and falls off a cliff ledge, to his presumed death.