Based on the fairy tales written by the Brothers Grimm, Grimm was an NBC supernatural drama that seemed to defy all odds. It was released in 2011, when other fantasy shows such as Constantine, based on the hit adult DC Comic Hellblazer, were dropping like flies. The popularity of serialized television was still relatively new, but Grimm also had a procedural element, making it more akin to series like The X-Files. It blended the familiar format of a monster/mystery-of-the-week series with a fantastical internal mythology.
Source：https://www.cbr.com/why-grimm-ended-canceled/
