20th Century Fox wanted to sue Ciro Ippolito $10,000,000 for using Alien (1979) in the title. However, a British lawsuit pointed out that there was a novel from the 1930s called "Alien", so Ippolito won the case.
Director Ciro Ippolito unsuccessfully tried to sue the producers of The Descent (2005) because of a slightly similar plot.
After Ciro Ippolito received the budget to make this film, he instantly spent a good portion of it on a new expensive car.
After the release of the film, there briefly circulated the idea of making a sequel titled "Alien 3", it was to be directed by Bruno Mattei and with special effects created by Gaetano Paolocci and Francesco Paolocci. The producer was interested to see if there was an interest in the market, but after a careful analysis, he decided not to proceed with the making of the film. Although the project was never realized, there is an early poster design for the film.
Given the great success of the film Alien (1979) by Ridley Scott, Ciro Ippolito decided to exploit the fame and realize a following apocryphal sequel. The idea of producing a sequel to the film came to Ippolito during a break from assembling one of his Neapolitan films, a genre that he did not care for anymore. Ippolito along with the editor Carlo Broglio saw a screening of Alien at the Adriano Cinema in Rome. After seeing the film, the two noticed a huge poster that advertised Zombie (1979) by Lucio Fulci, a successful unofficial sequel to Dawn of the Dead (1978) (released in Italy as Zombi). It gave Ippolito the inspiration to make this film.