Grimm

"Grimm is an American police procedural fantasy television drama series. It debuted in the U.S. on NBC on October 28, 2011. The show has been described as "a cop drama—with a twist... a dark and fantastical project about a world in which characters inspired by Grimms' Fairy Tales exist", although the stories and characters inspiring the show are also drawn from other sources.

Grimm ran on Fridays for the entirety of its first season.[3] In March 2012, NBC renewed the show for a second season, which premiered on Monday, August 13, 2012, and continued on Mondays for four episodes, before returning to its original Friday timeslot on September 10.

On April 19, 2013, NBC has announced they would move Grimm to Tuesdays beginning on April 30, 2013 for the remainder of Season 2 until May 21 after The Voice replacing Ready for Love. Grimm was renewed for a third season on April 26, 2013. The third season premiere on October 25, 2013 returned the show to its original Friday timeslot."

See more
@Wikipedia

More info...

1. NBC
2. Grimm Wiki



Three Bad Wolves

Pilot

     3. A side note:
I LOVE this show.
Series in centered on this guy  who is a Grimm. His family has tracked down evil for centuries. He is unaware of this until his mother(?) tells him on her deathbed. He is able to see the creatures his family has hunted. He solves crimes that are acted out in a modern day version of the fairy tales by the Brothers Grimm. Plus, they played a Marilyn Manson song in the first episode!
Many people complain because the stories are dark, but the Grimm fairy tales are darker than other tales that is the whole legacy behind the Grimm Fairy Tales.