The Mad Doctor of Market Street

Lionel Atwill

Dr. Ralph Benson, posing as Graham

Una Merkel

Aunt Margaret Wentworth

Nat Pendleton

Red Hogan

Claire Dodd

Patricia Wentworth

Anne Nagel

Mrs. William Saunders

Hardie Albright

William Saunders

Richard Davies

Jim

John Eldredge

Dwight, Ship's Officer

Mala

Barab

Noble Johnson

Native Chief Elan

Rosina Galli

Tanaa, Chief's Wife

Al Kikume

Kalo

Milton Kibbee

Hadley

Byron Shores

Crandall, murdered detective

Tani Marsh

Tahitian Dancer

Billy Bunkley

Tahitian Dancer

Bess Flowers

Ship Passenger

Russell A. Gausman

Set Decoration

Jack Otterson

Art Direction

Vera West

Costume Design

Jerome Ash

Director of Photography

Hans J. Salter

Music Director

Paul Malvern

Associate Producer

Al Martin

Screenplay

Joseph H. Lewis

Director

Ralph Dixon

Editor