Fred Williams as Rex Forrester

Soledad Miranda as Jane Morgan

Horst Tappert as Dr. Andrew Thorrsen

Ewa Strömberg as Ingrid Thorsson

Siegfried Schürenberg as Sir Philip

Walter Rilla as Lord Kingsley

Blandine Ebinger as Lady Abigail Kingsley

Howard Vernon as Valet Humphrey

Paul Müller as Dr. Henry

Alberto Dalbés as Irving Lambert

Jesús Franco as Tino Celli

Rudolf Hertzog as Inspector

Karl Heinz Mannchen as Assistant Inspector

Ángel Menéndez as Prof. Forrester