Lon Chaney Jr.

as The Mummified Werewolf

Yerye Beirute

as Prof. Janning

George Mitchell André

as Dr. Frederick Munson

Fred Hoffman

as Detective Hammond

Rosita Arenas

as Ann Taylor (as Rosa Arenas)

Ramón Gay

as Dr. Edmund Redding

Alfredo Wally Barrón

as Henchman

Chuck Niles

as Douglas Banks