In 1590, someone - or something - began a killing spree around the village of Bedburg, in Germany. Cattle and livestock began turning up dead and horribly mutilated, and soon after, some townspeople met that same fate. The work of a large wolf was likely at play. 

When the "wolf" was captured and transformed into a well-known man in the village, the people then realized - they weren't dealing with a regular wolf, they were dealing with a werewolf. And it was so much worse.