Director
Fred C. Brannon
DIRECTOR
William Witney
Writer
Albert DeMond
WRITER
Basil Dickey
Jesse Duffy
Sol Shor
Stars (in credits order)
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)