Ed Bishop

as Stimson

as Self

as Card Player

as Dr. Tate

as Dr. Baker

as Al Peterson

as Henry Harris

as Harding (uncredited)

as Cmdr. Ed Straker

as Col. Stewart

as Smith

as Victor Stackman

as David Poulson

as Aries-1B Lunar Shuttle Captain

as Lt. Cmdr. Vance Cassidy (as Edward Bishop)

as Lieutenant Hacker U.S.N. - Communications

as Narrator

as Vogt