Season 1
Nick is descended from a line of creature hunters known as Grimms, who have the responsibility to protect the rest of mankind from the creatures who are known as Wesen. Aunt Marie also tells him that the trailer she brought contains information and equipment to help him in his task. gives Nick a small antique key and tells him to protect it with his life as "they" want it. With help from Monroe, a Blutbad he met while working on case, and Rosalee Calvert, a Fuchsbau, Nick deals with crimes involving several different types of Wesen ranging from the bear-like Jägerbars to the rat-like Reinigen.
Episodes
1 Pilot Oct 28, 2011 
2 Bears Will Be Bears Nov 4, 2011 
3 Beeware Nov 11, 2011 
4 Lonelyhearts Nov 18, 2011 
5 Danse Macabre Dec 8, 2011 
6 The Three Bad Wolves Dec 9, 2011 
7 Let Your Hair Down Dec 16, 2011 
8 Game Ogre Jan 13, 2012 
9 Of Mouse and Man Jan 20, 2012 
10 Organ Grinder Feb 3, 2012 
11 Tarantella Feb 10, 2012 
12 Last Grimm Standing Feb 24, 2012 
13 Three Coins in a Fuchsbau Mar 2, 2012 
14 Plumed Serpent Mar 9, 2012 
15 Island of Dreams Mar 30, 2012 
16 The Thing with Feathers Apr 6, 2012 
17 Love Sick Apr 13, 2012 
18 Cat and Mouse Apr 20, 2012 
19 Leave It to Beavers Apr 27, 2012 
20 Happily Ever Aftermath May 4, 2012 
21 Big Feet May 11, 2012 
22 Woman in Black May 18, 2012