Grimm

Homicide Detective Nick Burkhardt of the Portland Police Bureau learns he is descended from a line of "guardians" known as "Grimms," charged with keeping balance between humanity and the mythological creatures (called "Wesen"; however the characters here use a mispronunciation of the German, rendering it like "vessin" instead of "vay-zen") of the world. Throughout the episodes, he must battle against an assortment of dangerous creatures, with help from his friend Monroe (who is a reformed creature), and his partner Detective Hank Griffin.