Director/a
Fred C. Brannon
DIRECTOR/A
William Witney
Reparto (por orden de créditos)
Charles Quigley
Duncan Richards
Linda Stirling
Diana Farnsworth
Clayton Moore
Louis Ashe
I. Stanford Jolley
Dr. Blackton [Ch. 11]
Kenne Duncan
Dr. Chambers [Chs. 1-2, 8]
Forrest Taylor
Prof. Van Wyck
Emmett Vogan
Anderson [Chs. 1-4]
Sam Flint
Maxwell
Joseph Forte
Prof. Parker
Stanley Price
Count Fator [Chs. 11-12]
Wheaton Chambers
Wilson [Ch. 1]
Tom Steele
Henchman Stricker [Chs. 4, 7, 9]
Dale Van Sickel
Henchman Harte [Chs. 6-7]
Rex Lease
Bain
Fred Graham
Snyder [Chs. 1-2]
Bud Wolfe
Cross - Apartment Thug [Chs. 11-12]
Rod Bacon
Armored Car Guard [Ch. 3] (uncredited)
Virginia Carroll
Nurse [Chs. 8-9] (uncredited)
John Daheim
Police Driver [Ch. 3] (uncredited)
Carey Loftin
Lab Guard #1 [Ch. 9] (uncredited)
George Magrill
Henchman Fiske [Ch. 3] (uncredited)
Jimmy Noel
Clerk (uncredited)
Eddie Parker
Henchman Sherman [Chs. 1, 8] (uncredited)
Rose Plumer
Mrs. Malloy [Ch. 11] (uncredited)
Loren Riebe
Truck Henchman [Ch. 6] (uncredited)
Eddie Rocco
Kell (uncredited)
Dick Rush
Police Inspector [Ch. 12] (uncredited)
Bill Scully
Richards' Assistant (uncredited)
Duke Taylor
Lab Henchman [Chs. 7-8] (uncredited)
Ken Terrell
Warehouse Thug [Chs.10-11] (uncredited)
Robert J. Wilke
Scott - Armored Car Driver [Ch. 3] (uncredited)
Bill Wilkus
Cole the Pilot [Chs. 5-6] (uncredited)
Bill Yrigoyen
Lab Henchman [Ch. 2] (uncredited)
Joe Yrigoyen
Janitor-Thug [Ch. 1] (uncredited)