Starring David Giuntoli, Bitsie Tulloch, Silas Weir Mitchell, Sasha Roiz and Russell Hornsby, the show is about a police detective who investigates crimes with supernatural elements. The series debuted on NBC this fall.
"We are very pleased to be making a full-season commitment for 'Grimm,'" NBC Entertainment chairman Robert Greenblatt said in a statement issued to The Hollywood Reporter Monday. "This series is turning the traditional procedural drama on its head and is attracting a loyal following for us on Friday nights. We love where it's going creatively and we're excited to deliver more episodes to our audience."