Alien is one of the greatest science fiction movies of all time. So, of course, there are lots of movies that rip it off. Some are inspired by it, others are pure knockoffs. Some of them are terrible, but some of them are great. These are the ones that are worth your time.
1960s Sc-Fi Worth Watching: https://youtu.be/ORbHm3gT_b4?feature=shared
Best Star Wars Ripoffs: https://youtu.be/BEW9m-nRW0Q?feature=shared
Why Event Horizon Failed: https://youtu.be/lqXwUNCp9wY?feature=shared
James Cameron’s Star Wars Ripoff: https://youtu.be/eYE-Igkd6TM?feature=shared