William MenziesDirector
Helena CarterDr. Pat Blake
Arthur FranzDr. Stuart Kelston/Narrator
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 EldridgeMr. 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
