Vincent Price as Dr. Browning

Christopher Lee as Fremont

Peter Cushing as Major Heinrich Benedek

Judy Huxtable as Sylvia

Alfred Marks as Detective Supt. Bellaver

Michael Gothard as Keith

Anthony Newlands as Ludwig

Peter Sallis as Schweitz

David Lodge as Detective Inspector Phil Strickland

Uta Levka as Jane

Christopher Matthews as Dr. David Sorel

Judy Bloom as Helen Bradford

Clifford Earl as Detective Sgt. Jimmy Joyce

Kenneth Benda as Prof. Kingsmill

Marshall Jones as Konratz

Amen Corner as Self - The Amen Corner

Yutte Stensgaard as Erika

Julian Holloway as Detective Constable Griffin

Nigel Lambert as Ken Sparten

Kay Adrian as Nurse

Rosalind Elliot as Valerie

Lee Hudson as Matron

Olga Linden as Alaia Stevens, First Victim

Gertan Klauber as Border Guard

Deirdre Costello as Doctor