Director/a
Fred C. Brannon
DIRECTOR/A
Reparto (por orden de créditos)
Kirk Alyn
Insp. David Worth
Rosemary La Planche
Laura Keith
Roy Barcroft
Spade Gordon
Carol Forman
Nila
James Dale
Agent Steve Evans
Bruce Edwards
Prof. Paul Williams [Chs. 1-6]
James Craven
Prof. James Clayton [Chs. 1, 10-12]
Tristram Coffin
Frank Chambers [Ch. 8]
Tom Steele
Grey - Henchman [Chs. 1-3]
Dale Van Sickel
Mac - Henchman
Jack O'Shea
Ali [Chs. 1, 10-12]
Marshall Reed
Det. O'Hara [Ch. 9]
Robert J. Wilke
Zod - Pursuit Plane Pilot [Chs. 10]
Robert St. Angelo
Native #3 [Ch. 11]
Dave Anderson
Porter [Ch. 9]
James Carlisle
Prof. Elwood M. Graves [Ch. 6] (uncredited)
John Daheim
Cave Guard #2 [Ch.11] (uncredited)
Art Dillard
Native #2 [Chs. 11-12] (uncredited)
George Douglas
Courier (uncredited)
Sol Gorss
Digger #1 [Chs. 1, 11-12] (uncredited)
Bert LeBaron
Warehouse Thug [Chs. 1-2, 10] (uncredited)
Carey Loftin
Ambulance Thug [Ch. 3] (uncredited)
Post Park
Headquarters Thug [Ch. 9] (uncredited)
Loren Riebe
Digger #2 [Chs. 1, 11-12] (uncredited)
David Sharpe
Native #4 [Ch. 11] (uncredited)
Duke Taylor
Roadblock Thug [Ch. 5] (uncredited)
Ken Terrell
Museum Thug [Ch. 6] (uncredited)
Bud Wolfe
Chemical Company Thug [Ch. 4] (uncredited)
Joe Yrigoyen