Kirk Alyn
Inspector 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]
Dave Anderson
Porter [Ch. 9]
Fred A. Ritter
Art Direction
John MacBurnie
Director of Photography
Fred C. Brannon
Director
Franklin Adreon
Associate Producer
Stanley Wilson
Original Music Composer
Basil Dickey
Screenplay
Royal K. Cole
Sol Shor
William Lively
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