Jason Avery (Stephen Baldwin), night watchman at the New York Museum of Natural History, is ambushed by armed thieves on a mission to seize a mysterious obelisk with supernatural powers. During the confrontation, Jason recovers an amulet from the thieves that opens a time portal. Sucked in and hurled back thousands of years to a time terrorized by mythological harpies—evil winged female creatures who steal souls and devour flesh—Jason is largely received as the prophesied savior who has come to rescue the villagers from the bloodthirsty demons. As he battles the horrific harpies and bonds with the townspeople, Jason realizes that he must use the amulet that sent him here to get back home to present day. But he isn't the only one who has made this discovery; a mortal villain with thousands of harpy eggs is forming an army to conquer the world, and he's hitching a ride back with Jason. The harpies legend is about to become reality!