Shout Factory remastered Blu Ray
Includes review: https://www.blu-ray.com/movies/Forbidden-World-Blu-ray/241766/
There are two versions of the movie on this disc: "Forbidden World" (77:14) and "Mutant" (82:02), which is available here as a "2K scan of the only existing film print."
Forbidden World (1982) - Official Trailer (NSFW) https://www.youtube.com/watch?v=-sDWjXk335s