Michael Fassbender has never forgiven his parents for letting him watch Alien as a child, because the creepy movie left him "disturbed".

The actor, who stars in Alien-inspired film Prometheus, was so frightened by the 1979 sci-fi horror movie he grew convinced his body could be infiltrated by extraterrestrial beings and his life would come to a gruesome end.

He tells the Chicago Sun-Times, "My parents allowed me to see it for some reason, which was odd because they were very strict. For some reason, they had no problem with their child seeing creatures bursting out of the chests of human beings.

"I'll never forget running home very disturbed. I'll never forget (actor) John Hurt laying on that table in space and this creature just bursting out of him. I thought, 'Whoa, what am I watching here? Could this happen to me?'"