Gene Barry as Michael London

John Saxon as Cheval

Senta Berger as Mila Darvos

Tom Simcox as Leland McCord

Mary Ann Mobley as Peggy Coopersmith

Werner Peters as Dr. Lenz

Donald Woods as Shepherd

Jack Kruschen as Capt. Granicek

John Marley as Kapel

Philip Bourneuf as Claude

Norma Varden as Englishwoman

Émile Genest as Henri the Conductor

Moustache as Gustav

Allen Jaffe as Dr. Lenz's Henchman