Dirección: Gary Nelson
Una pequeña nave que explora el espacio exterior llega hasta las proximidades de un agujero negro; a punto de ser absorbida por él, sus tripulantes descubren una gigantesca nave cuyo comportamiento les resulta inexplicable.
Maximilian Schell
Dr. Hans Reinhardt
Anthony Perkins
Dr. Alex Durant
Robert Forster
Captain Dan Holland
Joseph Bottoms
Lieutenant Charles Pizer
Yvette Mimieux
Dr. Kate McCrae
Ernest Borgnine
Harry Booth
Tom McLoughlin
Captain S.T.A.R.
Roddy McDowall
V.I.N.CENT. (voice) (uncredited)
Slim Pickens
B.O.B. (voice) (uncredited)
Gary Nelson
Drone with Mask Removed (uncredited)
Steven Banks
Sentry Robot (uncredited)
Don Lewis
Sentry Robot (uncredited)
