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
Dan Riss
Dr. Frank Werner
Michael Fox
Dr. Klinger
