Moorwen

Moorwen is the name given to an alien monster from the sci-fi movie Outlander, it was transported to Viking-era Norway due to it smuggling itself into a space-craft being used by Kainan, a survivor from a distant world that was ravaged by the Moorwen: the rest of the film deals with Kainan's struggle to stop the Moorwen from killing the largely hapless Norse people while also trying to adapt to the alien world of medieval Earth.