Characters played by Russell Hopton
Det. Lt. Ted Mallory
Characters played by Lola Lane
Kay Palmer
Characters played by George F. Marion
Jim Gray
Characters played by Lee Kohlmar
Prof. Ernst Einfeld
Characters played by John St. Polis
Prof. Trowbridge
Characters played by Lew Kelly
Det. Regan
Characters played by E.H. Calvert
District Attorney
Characters played by Wheeler Oakman
Langsdale - aka George Fremont
Characters played by Robert Frazer
Morgan
Characters played by Cornelius Keefe
Clay Gorman
Characters played by John Davidson
Ahmad Haidru
Characters played by John Dilson
McCoonerll - Newspaper Editor
Characters played by Lynton Brent
Reporter
Characters played by Ralph Brooks
Reporter
Characters played by James Carlisle
Lecture Guest
Characters played by Charles K. French
Manning
Characters played by Charles Hagen
Lecture Guest
Characters played by Creighton Hale
Witness
Characters played by Henry Hall
Ross - Medical Examiner Ross
Characters played by Jane Keckley
Witness
Characters played by Frank LaRue
Desk Sergeant
Characters played by Joel Lyon
Reporter
Characters played by Eric Mayne
Lecture Guest
Characters played by George Nardelli
Lecture Guest
Characters played by Hal Price
Detective
Characters played by Dick Rush
Det. Patterson
Characters played by Forrest Taylor
Lecture Guest
Characters played by Herb Vigran
Police Photographer
Characters played by Charles West
Fingerprint Expert