The Phantom Planet is a 1961 independently made American black-and-white science fiction film, produced by Fred Gebhardt, directed by William Marshall, that stars Dean Fredericks, Coleen Gray, Anthony Dexter, and Francis X. Bushman. The film was released in the U.S. by American International Pictures as a double feature with Assignment Outer Space.

Coleen Gray was an American actress. She was best known for her roles in the films Nightmare Alley (1947), Red River (1948), and Stanley Kubrick's The Killing (1956).