Charles Quigley
Duncan Richards
Acting
Linda Stirling
Diana Farnsworth
Acting
Clayton Moore
Louis Ashe
Acting
I. Stanford Jolley
Dr. Blackton [Ch. 11]
Acting
Kenne Duncan
Dr. Chambers [Chs. 1-2, 8]
Acting
Forrest Taylor
Prof. Van Wyck
Acting
Emmett Vogan
Anderson [Chs. 1-4]
Acting
Sam Flint
Maxwell
Acting
Joseph Forte
Prof. Parker (as Joe Forte)
Acting
Stanley Price
Count Fator [Chs. 11-12]
Acting
Wheaton Chambers
Wilson [Ch. 1]
Acting
Tom Steele
Henchman Stricker [Chs. 4, 7, 9]
Acting
Dale Van Sickel
Henchman Harte [Chs. 6-7]
Acting
Rex Lease
Bain
Acting
Fred Graham
Snyder [Chs. 1-2] / Zane [Ch. 8]
Acting
Bud Wolfe
Cross - Apartment Thug [Chs. 11-12]
Acting