Boris Karloff

Clayton Mace,Dr. Thorne,Dr. Albert Farnham,.....

Henry Daniell

Count Alexander Cagliostro,Pierre Radin,Squire Moloch,.....

Peter Brocco

Padre Herrera,Prof. Thibault,Major Domo ('A Terribly Strange Bed'),.....

Doris Lloyd

Mother Evans,Dame Alice,Mrs. Edith Pringle,.....

Ed Nelson

Charlie,Brundage,Tom Ellison / Daniel Le Jean

Paul Newlan

Paul Hawkins,Sgt. Bernstein,Sheriff Tom Ulysses Willetts,.....

Audrey Dalton

Meg O'Danagh Wheeler,Norine Burton,Nesta Roberts

Edward Andrews

Maynard Thispin,Frank Logan,Miles Tundifer

Alan Napier

Constable Evans,Lawyer Ridgewater,Attorney Pinchot

Ronald Howard

Martin Gresham,Robert Penrose,Dr. Edward Stone