When did the "Grimm" series first premiere?

"Grimm" premiered on Oct. 28, 2011, on NBC. The first episode, simply titled "Pilot," involved Detective Nick Burkhardt realizing that he can see which humans are actually monsters in disguise.

As of November 2015, five seasons of "Grimm" have aired, totalling 91 episodes. The show stars David Giuntoli as Detective Burkhardt, alongside Russell Hornsby, Bitsie Tulloch and Silas Weir Mitchell. The show airs at 9 p.m. on Fridays and has received fairly positive reviews for its ability to blend genuine horror and light-hearted humor. The fifth season of "Grimm" premiered on Oct. 30, 2015, to positive reviews and fairly successful viewership ratings.