Three men gamble their lives in space to change the history of the world
William Lundigan
Dr. Richard Donald Stanton
Herbert Marshall
Dr. Donald L. Stanton / Narrator
Richard Carlson
Dr. Jerry Lockwood
Martha Hyer
Dr. Jane Flynn
Dawn Addams
Susan Manners
Robert Karnes
Walter Gordon
Lawrence Dobkin
Dr. Delmar
George Eldredge
Dr. Paul Dryden
