Director/a
Harry L. Fraser
DIRECTOR/A
George Melford
Reparto (por orden de créditos)
Frank Buck
Frank Hardy
Sasha Siemel
'Tiger' Van Dorn
Reginald Denny
Ralph Marshall [Chs.1-3]
Esther Ralston
Valerie Shields [Chs. 1, 3, 6, 7, 15]
Charlotte Henry
Dorothy Elliott
William Bakewell
Tom Banning
Clarence Muse
Lightning - Street Singer
Willie Fung
Chiang - Houseboy
LeRoy Mason
Jim Murphy
Matthew Betz
Inspector Starrett
Richard Tucker
Robert Banning
Duncan Renaldo
Armand Roget
Fred Kohler Jr.
Det. John Charles - alias Quinn [Chs. 5-6]
Sherwood Bailey
Paul Marshall [Chs.2-3, 6, 8-10]
'Snub' Pollard
Campbell - Hardy's Aide [Chs. 1, 2, 4, 7, 8]
George Rosener
The Professor
Gertrude Sutton
Mrs. Maitland - Housekeeper
John St. Polis
Chandler Elliott [Ch. 1]
John Davidson
Dr. Coleman
Milburn Morante
Singapore Joe [Chs. 2, 7, 9, 15]
Dirk Thane
Joe Nolan [Chs. 1, 5, 6]
Robert Warwick
Chief Insp. Angus MacLeod
Dahlam Ali
Hardy's Assistant (uncredited)
Jim Corey
Henchman (uncredited)
Paul Ellis
Greenway (uncredited)
Henry Hale
Jackson (uncredited)
Harry Harvey
1st Roget Clerk (uncredited)
Reed Howes
Sailor (uncredited)
Jack Ingram
Undercover Detective at Dive (uncredited)
Tom London
Detective Interrogating Pete (uncredited)
Merrill McCormick
Peters (uncredited)
Blackie Whiteford
Roger Williams