* Leo Gordon as Dr. Bob Morgan
* Suzan Ball as Helen
* Frank Gorshin as Captain John "Jack" Carter
* John Agar as Colonel Ted Morgan
* Richard Devon as Dr. Paul Reed
* Paul Dubov as General Harrison
* Susan Cabot as Martha
* Bart Roberts as Hank
* Dick Miller as Officer Sam
The film was directed by Fred F. Sears and written by William C. Campbell.