Dagon

After a boating accident off the coast of Spain, Paul and his girlfriend Barbara are swept into the decaying fishing village of Imboca. As night falls, people begin to vanish and things not quite human emerge. Pursued by the entire town, Paul fights for his life and uncovers Imboca's chilling secret: the inhabitants worship Dagon, a monstrous sea god, and Dagon's unholy offspring are roaming free.