Forbidden World, originally titled Mutant, is a 1982 American science fiction erotic horror film. The screenplay was written by Tim Curnen, from a screenstory by R.J. Robertson and Jim Wynorski. It was co-edited and directed by Allan Holzman, who had edited Battle Beyond the Stars two years earlier. The cast includes Jesse Vint, Dawn Dunlap, June Chadwick, Linden Chiles, Fox Harris and Michael Bowen. Forbidden World has also been released under the titles Mutant and Subject 20.