Alien 2: On Earth (Alien 2: Sulla Terra), also known as Alien Terror and Strangers, is a 1980 science fiction film written and directed by Ciro Ippolito. Produced in United States and Italy, it is a low-budget, unofficial and unauthorized sequel to the 1979 film Alien, although the plot has little connection to the original film. It follows a group of friends as they go caving together, only to come into contact with a voracious alien creature that gestates inside a living human host, unwittingly brought to Earth by a doomed human spacecraft.