Lionel Barrymore
Andre Dakkar
Jacqueline Gadsden
Sonia Dakkar
Lloyd Hughes
Nikolai Roget
Montagu Love
Falon
Mikhail
Snitz Edwards
Anton
Gibson Gowland
Dmitry
Dolores Brinkman
Teresa
Karl Dane
(uncredited)
Pauline Starke
Carl Roup
Underwater Creature (uncredited)
Angelo Rossitto
Underwater Creature
