Louis Hayward
Philip 'Scotty' Grayson
A security leak is found at a Southern California atomic plant. The authorities stand in fear that the information leaked would go to a hostile nation. To investigate the case more efficiently, Dan O'Hara, an FBI agent, and Philip Grayson, a Scotland Yard sleuth, join forces. Will they manage to stop the spy ring from achieving their aim?
Philip 'Scotty' Grayson
Daniel F. O'Hara
Dr. Anastasia 'Toni' Neva
Dr. Ritter von Stolb
Igor Braun
Krebs
Dr. Frederick Townsend
Dr. William Forrest
Anton Radchek
Dr. Homer Allen
Carl Bemish
Narrator (voice)
Police Sergeant
FBI Chemist
Voice on Tape Recorder
Mr. North
Mrs. Ecko, the Landlady
FBI Agent Miller
Adolph Mizner
Police Detective Gaines
Director
