John Ryan
as Frank Davies
Michael Ansara
as The Captain
Sharon Farrell
as Lenore Davies
Andrew Duggan
as The Professor
Guy Stockwell
as Bob Clayton
James Dixon
as Lieutenant Perkins
Robert Emhardt
as The Executive
William Wellman Jr.
as Charley
Daniel Holzman
as Chris Davies
Shamus Locke
as The Doctor
Mary Nancy Burnett
as Nurse
Diana Hale
as Secretary (uncredited)
Patrick MacAllister
as Expectant Father (uncredited)
Gerald York
as Expectant Father (uncredited)
Jerry Taft
as Expectant Father (uncredited)
Gwil Richards
as Expectant Father (uncredited)
W. York
as Expectant Father (uncredited)