My husband and I watched a movie on cable in a hitel one night about this very hideous thing that kept changing into different animals and I believe people also. I remember one part where it turned i to a lady’s head and the head was sliced with a chain saw. The only way they could kill the darn thing was to go back in the knight days.It was really good and I would love to know the name of it. Thanks.
It partially sounds like Evil Dead II. Ending with Ash going back in time. Although the premise of changing into different animals is a bit off. He did have to cut his possessed girlfiends head with a chainsaw.