Four members of the Astro-Investigation and Defence Service arrive at a small town to investigate a report of UFO activity. What they find is a small army of aliens harvesting humans, to use as the new intergalactic fast food hit, in their fast food chain Crumb's Crunchy Delights. The unlikely heroes start fighting backs with everything they can put their hands on, and the blood and gore starts flying in very large amounts. In the beginning of the film Derek (Peter Jackson) falls from a high cliff, and even though his fall is broken by large amounts of seagulls has his skull cracked open, and some of his brain falls out. Throughout the rest of the film Derek continuously has a problem with the hole in his head and substitutes the brain matter that falls out with all kinds of things. One by one our heroes die, and in the end only Derek remains to take the fight to the aliens' ship and in the end even into space.