Cast & Crew
- Helena CarterDr. Pat Blake
-
Arthur FranzDr. Stuart Kelston - Jimmy HuntDavid MacLean
- Morris AnkrumCol. Fielding
- Leif EricksonMr. George MacLean
- Hillary BrookeMrs. Mary MacLean
- Max WagnerSgt. Rinaldi
- Milburn StoneCapt. Roth
- Walter SandePolice Desk Sgt. Finlay (uncredited)
- Janine PerreauKathy Wilson
- John EldredgeMr. Turner (uncredited)
- Robert ShayneDr. Bill Wilson (uncredited)
- Luce PotterMartian Intelligence (uncredited)
- Lock MartinMutant Carrying David to 'Intelligence' (uncredited)
- Max PalmerMutant Carrying Dr. Blake to 'Intelligence' (uncredited)
- William PhippsSgt. Baker
- William Cameron MenziesDirector
- Edward L. AlpersonProducer
- Richard BlakeWriter