American tourists David (David Naughton) and Jack (Griffin Dunne) are savaged by an unidentified vicious animal whilst hiking on the Yorkshire Moors. David awakes in a London hospital to find his friend dead and his life in disarray. Retiring to the home of a beautiful nurse (Jenny Agutter, Walkabout) to recuperate, he soon experiences disturbing changes to his mind and body, undergoing a full-moon transformation that will unleash terror on the streets of the capital...
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