Doctor Satan (as Edward Ciannelli)
Bob Wayne / 'Copperhead'
Speed Martin
Prof. Thomas Scott
Lois Scott
Alice Brent
Gov. Bronson [Ch. 1]
Police Chief Rand [Chs. 1, 4, 13]
Col. Bevans
Stoner
Gort
Hallett
Corbay [Ch. 1]
Ross
Scarlett [Chs. 1-5]
Corwin (as Kenneth Terrell)
Joe [Chs. 9-15]
Henchman-Driver Spike [Ch. 8-9] (uncredited)
Gray - Pick-up Thug [Chs. 14-15] (uncredited)
Panamint Pete [Ch. 8] (uncredited)
Co-Pilot [Chs. 12-13] (uncredited)
Sailor at Winch [Chs. 3-4] (uncredited)
Nurse [Ch. 11] (uncredited)
Barton [Ch. 1] (uncredited)
Police Lieutenant [Ch. 7] (uncredited)
Wells -Governor's Secretary (uncredited)
Wells - Governor's Secretary [Ch. 1] (uncredited)
Burns - Station Master [Chs. 8-9] (uncredited)
Officer [Ch. 11] (uncredited)
Gas Station Attendant [Ch. 4] (uncredited)
Plant Henchman [Chs. 10-11] (uncredited)
Al (uncredited)
Roper (uncredited)
Duke - Mine Thug [Ch. 9] (uncredited)
Red - Mine Thug [Ch. 9] (uncredited)
Capt. Lathrop [Chs. 1-2] (uncredited)
Proprietor [Ch. 5] (uncredited)
House Heavy [Ch.15] (uncredited)
Steve - Pilot [Chs. 12-13] (uncredited)
Fallon - Henchman [Chs. 10-11] (uncredited)
House Heavy [Ch. 15] (uncredited)
Chuck - Lead Truck Thug [Chs. 8-9] (uncredited)
P&G Warehouse Mgr. [Ch. 10] (uncredited)
Henchman-Guard [Ch. 2] (uncredited)
Jake - Biplane Pilot [Ch. 2] (uncredited)
Detective Brock (uncredited)
Warehouse Watchman [Ch. 7] (uncredited)
Truck Henchman (uncredited)
Davis - Police Officer [Ch. 1] (uncredited)
Watkins - Fire Escape Thug [Chs. 6-7] (uncredited)
Detective Perry (uncredited)
Palmer - Thug [Chs. 5-6] (uncredited)
Prof. Williams [Chs. 12-14] (uncredited)
Truck Henchman [Chs. 8-9] (uncredited)
Sailor at Cable [Chs. 3-4] (uncredited)