Boris Karloff

James Lee Wong

Marjorie Reynolds

Roberta 'Bobbie' Logan

Grant Withers

Capt. William Street

William Stelling

Dick Fleming

Catherine Craig

Cynthia Wentworth

Guy Usher

Paul Fleming

Henry Brandon

Attorney Victor Martin

Melvin Lang

Cyrus B. Wentworth

Wilbur Mack

Matthews

Kenneth Harlan

Ludlow

Richard Loo

Tong Leader

Tris Coffin

Mr. Baldwin - Adjuster (uncredited)

Gibson Gowland

Doctor (uncredited)

Jack Kennedy

Police Sgt. Casey (uncredited)

Bill Willmering

Det. Blake (uncredited)

Mike Donovan

Det. Mike

Maxine Leslie

Miss Reed - Secretary

Moy Ming

Aged Tong Member

Angelo Rossitto

Newsboy #3 in Montage

Mr. Wong, Detective

The Mystery of Mr. Wong

Mr. Wong in Chinatown

The Fatal Hour

Doomed to Die

Phantom of Chinatown