Christopher Lee

as Dr. Stephen Hayward

Jon Finch

as Lomax

Judy Geeson

as Helen

Dilys Hamlett

as Julia Hayward

Tony Beckley

as Sgt. Greene

Jane Merrow

as Mary Dawson

Colin Jeavons

as Bob Dawson

David Trevena

as Johnson

Adrian Cairns

as Morgan

Sidney Hayers

Director