Duncan Richards
Charles Quigley
Diana Farnsworth
Linda Stirling
Wilson [Ch. 1]
Wheaton Chambers
Henchman Stricker [Chs. 4, 7, 9]
Tom Steele
Henchman Harte [Chs. 6-7]
Dale Van Sickel
Bain
Rex Lease
Snyder [Chs. 1-2] / Zane [Ch. 8]
Fred Graham
Cross - Apartment Thug [Chs. 11-12]
Bud Wolfe
Louis Ashe
Clayton Moore
Dr. Blackton [Ch. 11]
I. Stanford Jolley
Dr. Chambers [Chs. 1-2, 8]
Kenne Duncan
Prof. Van Wyck
Forrest Taylor
Anderson [Chs. 1-4]
Emmett Vogan
Maxwell
Sam Flint
Prof. Parker (as Joe Forte)
Joseph Forte
Count Fator [Chs. 11-12]
Stanley Price
Stunt Double
Polly Burson
Director
William Witney
Screenplay
Albert DeMond
Jesse Duffy
Fred C. Brannon
Sol Shor
Basil Dickey
Set Decoration
John McCarthy Jr.
Editor
Cliff Bell Sr.
Director of Photography
Bud Thackery
Original Music Composer
Mort Glickman
Art Direction
Fred A. Ritter
Special Effects
Theodore Lydecker
Earl Wooden
Howard Lydecker
Harold Minter
Sound
William E. Clark
Associate Producer
Ronald Davidson