Kay Kyser

Himself

Peter Lorre

Professor Karl Fenninger

Boris Karloff

Judge Spencer Mainwaring

Béla Lugosi

Prince Saliano

Helen Parrish

Janis Bellacrest

Dennis O'Keefe

Chuck Deems

Alma Kruger

Aunt Margo Bellacrest

Joseph Eggenton

Jurgen

Ginny Simms

Herself

Harry Babbitt

Himself

M.A. Bogue

Ish Kabibble

Sully Mason

Himself

Mary Bovard

Mary (uncredited)

Jeff Corey

Mr. Corey (uncredited)

Louise Currie

Marion (uncredited)

Bess Flowers

Lady In Taxi (uncredited)

Jeanne Houser

Jean (uncredited)

Richard Kipling

Script Man (uncredited)

Eleanor Lawson

Ms. Gaby Lawson (uncredited)

Larry McGrath

Apartment Complainer (uncredited)

Frank Mills

Cabbie (uncredited)

Mimi Montaye

Mimi (uncredited)

Dorothy Moore

Penny (uncredited)

Leonard Mudie

Real Karl Fenninger (uncredited)

Joseph North

Servant (uncredited)

Frank O'Connor

Apartment Responder (uncredited)

Beulah Parkington

Mother (uncredited)

Jane Patten

Jane (uncredited)

Eugenia Rafee

French Maid (uncredited)

William Telaak

Mac (uncredited)

Joan Warner

Joan (uncredited)

Guy Webster

Infant (uncredited)

Mary Martha Wood

Georgia (uncredited)