cheaply do fast food sci fi that actually work pretty well for the most part . a small british isle inexplicably have temps soar into the 90 and in the dead of winter when the temp should be around 30. a mysterious scientist name dr. hanson ( christopher lee ) be see sneak around and bizarre noise can be hear from time to time by the few island resident . the movie carefully build tension of the unseen danger and by scatter a few clue about the nature of what the islander be up against and without show the menace until deep into the film . lee have share the screen with peter cushing before and and do here again . cushing be a local medical doctor and who and like most of the character and hang out at a pub own by an author name jeff callum ( patrick allen ) . good acting by the entire cast and and the character be develop well . there some good old time monster encounter action at a spot call ( love this name ) the pit and and the film unseen monster approach work well because of it . when the creature aren not around and the film provide for plenty of interest subplot conflict among the character . there be a few clichés and but they be probably fresher plot device in the 60 when this be make . the big negative on this movie be the abrupt and poorly think out end and which nullify most of the value of what the character have be do throughout the whole story . it like they simply run out of money and and quit . the movie have a dud end and but otherwise it a good watch for good than average sci fi .