Kirk Alyn
Inspector David Worth
Acting
Rosemary La Planche
Laura Keith
Acting
Roy Barcroft
Spade Gordon
Acting
Carol Forman
Nila
Acting
James Dale
Agent Steve Evans
Acting
Bruce Edwards
Prof. Paul Williams [Chs. 1-6]
Acting
James Craven
Prof. James Clayton [Chs. 1, 10-12]
Acting
Dave Anderson
Porter [Ch. 9]
Acting