Gene Barry
— Michael A. Donovan
Joan Collins
— Anne Langley
Richard Todd
— Col. Victor Redmayne
Tom Adams
— Peter Langley
Suzanna Leigh
— Donetta
Michael Rennie
— Goldsmith
Gretchen Franklin
— Bus Conductress
Marius Goring
— Shevik
Scott Forbes
— Pannell
Colin Gordon
— Kitteridge
Guy Deghy
— Dr. Lundgren
John Welsh
— Heiner
Robert Raglan
— Fennimore
Derek Ware
— Shevik's Henchman