Katahdin

Katahdin is the main villain in the 1979 movie Prophecy.

Katahdin is a horrifically mutated grizzly bear that has grown to abnormal size. It is believed that its parents consumed fish contaminated with Inorganic Methylmercury, which caused the mutation of this monster when it was still in the womb (which in turn happens to Katahdin's own offspring). It was named by the local American Indian tribes, and mistaken for an ancient spirit angered by the logging activity on the mountain.

The beast is unusually large for a grizzly bear, and its face and body are hideously deformed. Katahdin is also mentally deranged and extremely hostile, impulsively mauling anyone and anything it comes across. It is drawn to the cries (and possibly the smell) of its cubs, which is what causes it to pursue the protagonists throughout the film. After killing the bulk of the main cast, it is finally stabbed to death with an American Indian arrow; however, another Katahdin appears just before the end credits, suggesting an unknown number of Katahdins are still roaming the woods.