- Richard Arlen
- Lewis J. 'Lee' Deerhold
- Wendy Barrie
- Ann Patterson
- Nils Asther
- Dr. Arthur Huneker
- Roger Pryor
- G.B. Fleming
- Abner Biberman
- Cmdr. Toyo
- Marc Lawrence
- Vincent Bela
- John Miljan
- Mr. Bambridge / Capt. Haigas
- Patsy Nash
- Tina Deerhold
- Ralph Sanford
- Agent Freddie Grayson
- William Bakewell
- Agent Pomeroy - Fleming's Aide
- Jack Carr
- Old Mill Gate Guard
- Edward Earle
- Dr. Barclay
- Edward Fielding
- Shipping Merchant
- Dwight Frye
- Haldine - Fifth Columnist
- Joe Garcio
- Henchman
- John George
- Man in FBI Raid
- Harry Hayden
- Larson
- Michael Jeffers
- FBI Agent
- Eddie Kane
- FBI Agent
- Edward Keane
- J.D. Deerhold's Boss
- Donald Kerr
- Dave - FBI Agent
- Robert Middlemass
- Johnny's Father
- Fred Sherman
- FBI Operative
- Stanley Smith
- Clerk
- Edwin Stanley
- Commanding Officer at Finish
- Milburn Stone
- Lt. Winston - Naval Intelligence
- Dale Van Sickel
- Radio Man
- Edward Van Sloan
- Dr. Johann Bergstrom
- Pat West
- Radio Listener
- Will Wright
- Local Sheriff
