Christopher Lee
— Dr. Stephen Hayward
Jon Finch
— Lomax
Judy Geeson
— Helen
Dilys Hamlett
— Julia Hayward
Tony Beckley
— Sgt. Greene
Jane Merrow
— Mary Dawson
Colin Jeavons
— Bob Dawson
David Trevena
— Johnson
Adrian Cairns
— Morgan
Daphne Neville
— Nurse Fisher
Hugh Smith-Marriott
— Dr. Chapman
Hubert Tucker
— Ronalds
David Langford
— Gray