American Werewolf in London

An American Werewolf in London (1981) Two young American men (David Naughton and Griffin Dunne) take a backpacking trip to England, and venture deep into the moors at night. They are attacked by a werewolf, which kills one and injures the other.  The survivor is taken to a hospital, and following disturbing dreams and apparitions of his dead friend, he finds that he will transform into a werewolf at the next full moon. Featuring incredible special effects by Rick Baker.