A remote Scottish island is quietly settling down for the winter, but amidst the fog that envelopes the island, something horrific is on the prowl. A slavering, monstrous 'creature' has killed twice, leaving just a trace of radiation, gruesome dismembered corpses and a baffled local police force. A flickery film of one of the murders seems to show a terrifying, shadowy monster. But could this brutal killer really be from another world? And can it be stopped before it inflicts more carnage on this lonely island?