The Secret of Dr. Mabuse or The Death Ray of Dr. Mabuse is a 1964 Franco-German-Italian international co-production science fiction Eurospy crime film directed by Hugo Fregonese and Victor De Santis and starring Peter van Eyck, O.E. Hasse and Yvonne Furneaux. It was a co-production between France, Italy and West Germany. The film was the last in a series of films which had revived the Weimar era character Doctor Mabuse.