Donald Pleasence as Mr. Justice Lawrence Wargrave

Brenda Vaccaro as Marion Marshall

Frank Stallone Jr. as Capt. Philip Lombard

Herbert Lom as Gen. Brancko Romensky

Sarah Maur Thorp as Vera Claythorne

Warren Berlinger as Det. William Henry Blore

Yehuda Efroni as Dr. Hans Yokem Werner

Neil McCarthy as Anthony Marston

Moira Lister as Ethel Mae Rodgers

Paul L. Smith as Elmo Rodgers