Dr. Hans Reinhardt

Maximilian Schell

Acting

Dr. Alex Durant

Anthony Perkins

Acting

Captain Dan Holland

Robert Forster

Acting

Lieutenant Charles Pizer

Joseph Bottoms

Acting

Dr. Kate McCrae

Yvette Mimieux

Acting

Harry Booth

Ernest Borgnine

Acting

Captain S.T.A.R.

Tom McLoughlin

Directing

V.I.N.CENT. (voice) (uncredited)

Roddy McDowall

Acting

B.O.B. (voice) (uncredited)

Slim Pickens

Acting

Drone with Mask Removed (uncredited)

Gary Nelson

Directing

Sentry Robot (uncredited)

Steven Banks

Writing

Sentry Robot (uncredited)

Don Lewis

Acting