Frank Jenkins
Bill Jones (as Chris Mitchum)
Ed Williams
Stanley (as B.T. Stone)
Astronaut
Jack Higgins
Drew
Morgan
Catherine 'The Cat'
George
John
Nick (as Robert Sean Burke)
Military Man
Harold Beckett
Amy Pierson
Elizabeth Pierson
Bryce Pierson
Mission Control Operator
F.B.I. Agent
Sheriff Weston (as Michael A. Prohaska)
FBI Agent (uncredited)