Roy Thinnes
David Vincent
Sally Kellerman
Laura Crowell
James T. Callahan
Dr. Harry Mills
Ed Begley
Dr. Samuel Crowell
Virginia Christine
Mrs. Thorne
Ed Peck
Darrow
Martin Blaine
Argyle
E.J. André
Dr. Henry Thorne
John Zaremba
Professor Ed Harrison
Bill Quinn
Police Lieutenant Eaton
Barbara Dodd
Miss Fox
Wilhelm von Homburg
Alien Patient
William Sumper
Cab Driver
William Woodson
Narrator (voice) (uncredited)
Hal Taggart
Pedestrian (uncredited)
Andrew J. McIntyre
Director of Photography
Murray Golden
Director
Jodie Copelan
Editor
Art Wallace
Writer
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