As Grimm was in essence a procedural drama, each episode mostly involved a core cast, and a revolving door of one-off appearances.

The core cast throughout the show was:

• David Giuntoli (A Million Little Things, 13 Hours) as detective-turned-supernatural hunter, Nick Burkhardt.
• Russell Hornsby (The Hate U Give, Fences) as Hank Griffin, Nick’s partner in the Homicide division.
• Silas Weir Mitchell (Prison Break, Paradise Lost) as supernatural insider, Monroe
• Sasha Roiz (The Day After Tomorrow, Chicago Med) as Captain Sean
  Renard
• Reggie Lee (The Lincoln Lawyer, All Rise) as Sergeant Drew Wu
• Elizabeth Tullock (Superman and Lois, The Artist) as Juliette Silverton, Nick’s on/off girlfriend.
• Bree Turner (The Ugly Truth, Just My Luck) as Rosalee Calvert
• Claire Coffee (Lincoln Rhyme: Hunt for the Bone Collector, General Hospital) as Adelind Schade.

Throughout the show’s entire run, Grimm managed to maintain an impressively large and devout audience for network NBC.

At its height during season three, Grimm peaked just short of eight million viewers per episode on average. By the time the show ended in season six, it still pulled in an average of just over six million.

However, the ratings success didn’t necessarily pass over into awards recognition every year. Over the course of the show’s run, it was nominated for only two Primetime Emmys, both for stunt coordination, and yet won neither.

Grimm garnered 17 nominations overall across all awards bodies - including People’s Choice Awards two years in a row for best Favourite Network Drama, and Best Genre TV series three years in a row at the Satellite awards.

The series now sits at 89 per cent critics rating and a 90 per cent audience score on aggregate site, Rotten Tomatoes, and maintains a strong 7.9/10 IMBb rating.

Grimm’s official rating in the UK, as certified by the British Board of Film Classification (BBFC), is 15 for the complete run. In the US, it is marked as PG-13 or TV-14.

All three ratings warn there may be scenes that may be inappropriate for younger or pre-teen audiences, despite the basis of the show being fairy tales.

There is no nudity on Grimm, and sex is always implied rather than being shown, and swearing is kept to mild, infrequent use.

However, in the case of Grimm, depictions of violence, and use of bloodshed and gore is the biggest reason for the rating increase.

Most episodes are based around at least one murder or attack, with the show leaning into horror and the supernatural.

These are at times depicted graphically, other times implied, and includes but is not limited to beheadings, mutilation, gun violence and fist-fighting.

Grimm ran for six seasons, totalling 123 episodes.

Seasons one to five ran for 22 episodes a piece.

However, the sixth and final season was massively stripped back, and only given a half-run time of 13 episodes.

Currently, there are no plans for a revival of Grimm, or a reboot.

During the show’s run, the Grimm team released three mini-series online - ‘Bad Hair Day’, ‘Love Is In The Air’, and ‘Meltdown’ - consisting of four seven-minute ‘webisodes’ apiece.

In October 2018, over a year after the finale, Variety reported that a spin-off was in the works by Melissa Glenn, who’s since been behind episodes of Iron Fist season two, and the Beauty And The Beast TV series.

The initial report claimed the show would fold in new characters to ‘build off the mythology’ already set by the show, with fan favourites making returns.

However, the show was never named, and plans appear to have since been abandoned.

Grimm is available to watch now on Sky Max and NOW.