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

Tristram 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