Robert Culp as William Sebastian

Gig Young as Dr. Ham Hamilton

John Hurt as Mitri Cyon

Gordon Jackson as Inspector Cabell

Ann Bell as Anitra Cyon

James Villiers as Sir Geoffrey Cyon

Majel Barrett as Lilith

Jenny Runacre as Sydna

Angela Grant as Butler

Penny Irving as First Maid

Vicki Michelle as Second Maid

Lindy Benson as Third Maid

Sally Farmiloe as Fourth Maid

Michael Latimer as Co-Pilot