An American Werewolf in London

An American Werewolf in London is a 1981 BritishAmerican horror comedy film written and directed by John Landis, and starring David Naughton, Jenny Agutter, and Griffin Dunne. The films plot concerns two young American men, David Kessler played by Naughton and Jack Goodman played by Dunne, attacked by a werewolf on a backpacking holiday in England. With Jack killed, David is taken to a London hospital, where his disturbing apparitions of his deceased friend informs him that he is a werewolf and will transform at the next full moon. Principal photography for the film was shot in London, Surrey, and Wales.

Two American college students, David Kessler David Naughton and Jack Goodman Griffin Dunne, backpack across the North York Moors. As darkness falls, they stop for the night at a pub called The Slaughtered Lamb. Jack notices a fivepointed star on the wall. When he asks about it, the pubgoers stop talking and become hostile, telling them to keep to the road and beware of the full moon. The pair decide to leave, but while talking they wander off the road onto the moors.Jack and David hear sinister howls, which seem to be getting closer. They start back to the Slaughtered Lamb but realize that they are now lost. The boys are attacked by a supernaturally large wolflike animal and Jack is killed. The attacker is shot by some of the pubgoers but instead of a dead animal, David sees the corpse of a naked man lying next to him. David survives the mauling and is taken to a hospital in London. ........

Source: Wikipedia