Det. Lt. Ted Mallory
Kay Palmer
Jim Gray (as George Marion Sr.)
Prof. Ernst Einfeld
Prof. Trowbridge
Det. Regan
District Attorney (as Capt. E.H. Calvert)
Langsdale - aka George Fremont
Morgan (as Robert Frazier)
Clay Gorman
Ahmad Haidru
McCoonerll - Newspaper Editor
Reporter (uncredited)
Lecture Guest (uncredited)
Manning (uncredited)
Witness (uncredited)
Ross - Medical Examiner Ross (uncredited)
Desk Sergeant (uncredited)
Detective (uncredited)
Det. Patterson (uncredited)
Police Photographer (uncredited)
Fingerprint Expert (uncredited)