Martin Landau

Commander John Koenig

Barbara Bain

Doctor Helena Russell

Barry Morse

Professor Victor Bergman

Nick Tate

Captain Alan Carter

Prentis Hancock

Paul Morrow

Zienia Merton

Sandra Benes

Roy Dotrice

Commissioner Gerald Simmons

Anthony Valentine

Male Alien

Isla Blair

Female Alien

Philip Madoc

Commander Anton Gorski

Lon Satton

Benjamin Ouma

Eric Carte

Eddie Collins