Not much of a "sequel"...
You'll figure it out after watching the review.
I continue my Journey Into the 1980s (from 1980 to 1989, alphabetical-wise and starting with the year 1980).
Alien 2: On Earth, initially known as Alien Terror and Strangers, is a 1980 science fiction film, written and directed by Ciro Ippolito before the trademark Alien was registered.
It was released following the success of the 1979 film Alien as an unofficial sequel, albeit having little connection to the film.
The film features a score by Guido De Angelis and Maurizio De Angelis, performed by the composers under the pseudonym Sam Cromwell.
The film co-starred a young Michele Soavi, years before he became a famed Italian horror film director in his own right, and a cameo appearance by Ciro Ippolito himself (in the role of "Joe").
It was filmed in California, the Cinecittà studios in Rome, and in the Castellana Caves.
Midnight Legacy released the film on DVD and Blu-ray on March 22, 2011, with the title Alien 2: On Earth.
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https://www.youtube.com/watch?v=SXH8Ey-7wYw