One of those monster movies where there's supposed to be several creatures but you only ever see the one. Can it be just coincidence that less than five years after Hans Conreid played the diabolical Dr Terwilliger in 'The 5,000 Fingers of Dr' his boss Tim Holt is called 'Twillinger'? Whatever. Conreid's the actor you're always watching whenever he's on the screen.