Peter Lorre
Role: Professor Karl Fenninger
Boris Karloff
Role: Judge Spencer Mainwaring
Bela Lugosi
Role: Prince Saliano
Helen Parrish
Role: Janis Bellacrest
Dennis O'Keefe
Role: Chuck Deems
Alma Kruger
Role: Aunt Margo Bellacrest
Joseph Eggenton
Role: Jurgen
Harry Babbitt
Role: Himself
M.A. Bogue
Role: Ish Kabibble
Mary Bovard
Role: Mary (uncredited)
Jeff Corey
Role: Mr. Corey (uncredited)
Louise Currie
Role: Marion (uncredited)
Bess Flowers
Role: Lady In Taxi (uncredited)
Jeanne Houser
Role: Jean (uncredited)
Richard Kipling
Role: Script Man (uncredited)
Eleanor Lawson
Role: Ms. Gaby Lawson (uncredited)
Larry McGrath
Role: Apartment Complainer (uncredited)
Frank Mills
Role: Cabbie (uncredited)
Mimi Montaye
Role: Mimi (uncredited)
Dorothy Moore
Role: Penny (uncredited)
Leonard Mudie
Role: Real Karl Fenninger (uncredited)
Joseph North
Role: Servant (uncredited)
Frank O'Connor
Role: Apartment Responder (uncredited)
Beulah Parkington
Role: Mother (uncredited)
Jane Patten
Role: Jane (uncredited)
Eugenia Rafee
Role: French Maid (uncredited)
William Telaak
Role: Mac (uncredited)
Joan Warner
Role: Joan (uncredited)
Guy Webster
Role: Infant (uncredited)
Mary Martha Wood
Role: Georgia (uncredited)
