Calificación
Reparto

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]