The Strange World of Planet X (a.k.a. Cosmic Monsters in the United States) is an independently made 1958 British science fiction horror film, produced by George Maynard and John Bash, directed by Gilbert Gunn, that stars Forrest Tucker and Gaby André. The film was distributed in the UK in February, 1958 by Eros Films. It was released in the US on July 7, 1958 by Distributors Corporation of America as a double feature with The Crawling Eye, also starring Tucker.