Kay Kyser

Character: Himself

Peter Lorre

Character: Professor Karl Fenninger

Boris Karloff

Character: Judge Spencer Mainwaring

Bela Lugosi

Character: Prince Saliano

Helen Parrish

Character: Janis Bellacrest

Dennis O'Keefe

Character: Chuck Deems

Alma Kruger

Character: Aunt Margo Bellacrest

Joseph Eggenton

Character: Jurgen

Ginny Simms

Character: Herself

Harry Babbitt

Character: Himself

M.A. Bogue

Character: Ish Kabibble

Sully Mason

Character: Himself

Mary Bovard

Character: Mary (uncredited)

Jeff Corey

Character: Mr. Corey (uncredited)

Louise Currie

Character: Marion (uncredited)

Bess Flowers

Character: Lady In Taxi (uncredited)

Jeanne Houser

Character: Jean (uncredited)

Richard Kipling

Character: Script Man (uncredited)

Eleanor Lawson

Character: Ms. Gaby Lawson (uncredited)

Larry McGrath

Character: Apartment Complainer (uncredited)

Frank Mills

Character: Cabbie (uncredited)

Mimi Montaye

Character: Mimi (uncredited)

Dorothy Moore

Character: Penny (uncredited)

Leonard Mudie

Character: Real Karl Fenninger (uncredited)

Joseph North

Character: Servant (uncredited)

Frank O'Connor

Character: Apartment Responder (uncredited)

Beulah Parkington

Character: Mother (uncredited)

Jane Patten

Character: Jane (uncredited)

Eugenia Rafee

Character: French Maid (uncredited)

William Telaak

Character: Mac (uncredited)

Joan Warner

Character: Joan (uncredited)

Guy Webster

Character: Infant (uncredited)

Mary Martha Wood

Character: Georgia (uncredited)