Martin Landau
— John Koenig
Barbara Bain
— Helena Russell
Barry Morse
— Victor Bergman
Roy Dotrice
— Commissioner Simmonds
Judy Geeson
— Regina Kesslann
Philip Madoc
— Commander Gorski
Prentis Hancock
— Paul Morrow
Nick Tate
— Captain Alan Carter
Zienia Merton
— Sandra Benes
Anton Phillips
— Doctor Bob Mathias