After the success of his film "Starcrash", director Luigi Cozzi wanted to follow it up with another science fiction film. On seeing Ridley Scott's film "Alien" his producer decided he wanted Cozzi to make something similar. Due to budgetary constraints Cozzi decided to set the film on Earth, although retaining the ideas of the alien eggs and a large creature from Scott's film, and duly wrote a script called "Alien Arrives on Earth". Producer Claudio Mancini wanted to use the name "Contamination", which had been the working title for an aborted film he had been developing based on the Jane Fonda film "The China Syndrome". The name was duly changed against Cozzi's wishes, with the producer also insisting on Cozzi developing more James Bond-style elements as opposed to his science fiction theme.