NBC has a message for viewers of its upcoming drama, Grimm: You've been warned.

On the supernatural-based series, which will air Friday nights at 10 this fall, David Giuntoli stars as Portland area Detective Nick Burkhardt. We watch as he starts to see unexplained visions and events, only to eventually learn why:

Nick is an ancestor of a group of hunters charged with taking down various creatures around the world. It's like an adult version of the upcoming ABC Family show, The Nine Lives of Chloe King.

Check out the official Grimm trailer now:

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.