Boris Karloff

Judge Winthrop Gelsey

Charles Brandon

Sir Arthur Strangeways, Montgomery Royle, Larkin

Imhotep (archive footage) (uncredited)

Dr. Gustav Niemann

(archive footage)

Gorca (segment "The Wurdalak")

Baron Victor Frederick Von Leppe

Dr. Scarabus

Pop Jenkins / Col. Jackson Beauregard Finchess, Dr. Thorne, Dr. Albert Farnham, Clayton Mace, Doktor Konrad Markesan, Self - Host

self

George Redford

Mr. Blue Ocean, Henry E. Church

Dr. Meissen

Voltan

Bennett Kimball

Toff, Bronson, Rasputin

Professor Koernig, King Arthur, Skaggs

George Sims

John Gray

Mord

Valdar

Mr. James Lee Wong

John Ellman

Dr. Janos Rukh

Edmond Bateman

Himself

Hjalmar Poelzig

Nikko

The Monster

Fedor's Father (uncredited)

T. Vernon Isopod

Sport Williams (uncredited), Sport Williams

Cokey Joe

The Voice (voice)

Henchman Baxter

Corsican

Indian (uncredited)