Peter Cushing

as Gustav Weil

Dennis Price

as Dietrich

Madeleine Collinson

as Frieda Gellhorn

Mary Collinson

as Maria Gellhorn

Isobel Black

as Ingrid Hoffer

Kathleen Byron

as Katy Weil

Shelagh Wilcocks

as Lady in Coach

Damien Thomas

as Count Karnstein