Season 4 of Grace kicks off tonight, with fans excited to see John Simm back in the title role – particularly after the jaw-dropping cliffhanger the previous batch of episodes ended on.

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Doctor Who and Life on Mars icon Simm gives a compelling turn as DS Roy Grace, the lead character of Peter James's ever-popular crime novels, who is attempting to move forward with his life in season 4.

For years, he has been haunted by the unexplained disappearance of his first wife, Sandy (Clare Calbraith), but has found love once more with the now-pregnant Cleo (Zoë Tapper).

However, with Sandy re-emerging in the previous season, it seems this attempt at turning over a new leaf will be more difficult than Grace could ever have expected.

The fourth season has confirmed Robert Glenister as a major guest star for the premiere, with his icy character debuting in an exclusive clip shared to readers of RadioTimes.com.

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In less exciting news, this will be the last season to feature Craig Parkinson as DS Norman Potting, after the Line of Duty actor confirmed he would be parting ways with the show after the finale. Here's hoping his character gets a proper send-off.

So, who else is in the main cast for the series and who do they all play? Read on for everything you need to know about the cast and characters in Grace.

John Simm plays DS Roy Grace

John Simm as DS Roy Grace in Grace
John Simm as DS Roy Grace in Grace Tall Story Pictures for ITV and ITVX

Who is DS Roy Grace? Brighton-based Detective Superintendent Roy Grace is a methodical, "hard-working police officer who has given his life to the job". Several years ago his wife went missing, a mystery he's never been able to crack. In season 4 he is finally moving on with his life, with his girlfriend Cleo, who is pregnant.

Where have I seen John Simm before? Simm is probably best known for playing the Master in Doctor Who and detective Sam Tyler in the acclaimed Life on Mars. Other projects have included Collateral, Strangers, Trauma, Cold Courage and The Village alongside Maxine Peake.

Richie Campbell plays DS Glenn Branson

Richie Campbell as Glenn Branson in Grace
Richie Campbell as Glenn Branson in Grace Tall Story Pictures for ITV and ITVX

Who is DS Glenn Branson? Glenn is Roy Grace's former protégée and partner. After getting shot at the end of Looking Good Dead, he's been having troubles in his personal life, including his marriage.

Where have I seen Richie Campbell before? Campbell is known for playing Chris in Top Boy and Liam Sutcliffe in Liar. He also starred in BBC One anthology series Small Axe, playing Rothwell Kentish in the episode 'Mangrove'.

Craig Parkinson plays DS Norman Potting

A close-up shot of Craig Parkinson as DS Norman Potting in Grace
Craig Parkinson as DS Norman Potting in Grace. Tall Story Pictures for ITV and ITVX

Who is DS Norman Potting? DS Potting is an old-school cop who is occasionally a little too blunt and sometimes politically incorrect, but is steady, dependable and gets results.

Where have I seen Craig Parkinson before? Parkinson is perhaps best known for his role as DI Matthew Cottan on Line of Duty, but also appeared on Doctor Who in 2021 as the villainous Grand Serpent. He has appeared in series such as Temple, Everything I Know About Love, The English Game, Mrs Sidhu Investigates, The Winter King and Renegade Nell.

Laura Elphinstone plays DS Bella Moy

Laura Elphinstone as DS Bella Moy in Grace, wearing a shirt and jacket
Laura Elphinstone as DS Bella Moy in Grace. Tall Story Pictures for ITV and ITVX

Who is DS Bella Moy? DS Moy is sharp, clever and has great instincts. She looks after her ailing mother but keeps her personal life very private.

Where have I seen Laura Elphinstone before? You'll know her as Brandyce in Line of Duty, among various other roles in the likes of Military Wives, Des, Chernobyl and Game of Thrones.

Zoë Tapper plays Cleo Morey

Zoe Tapper and Cleo in Grace, sat down and holding her baby bump
Zoe Tapper and Cleo in Grace Tall Story Pictures for ITV and ITVX

Who is Cleo Morey? Cleo is Senior Anatomical Pathology Technician at Brighton’s mortuary, and is in a relationship with Grace. She has a brilliant sense of humour, brims with confidence and is devoted to her work. At the end of season 3 she told Grace that she is pregnant with his child.

Where have I seen Zoë Tapper before? Tapper is best known for her roles in series such as Mr Selfridge and Liar. She also appeared in Netflix series The One and BBC's Rules of the Game.

Sam Hoare as ACC Cassian Pewe

Sam Hoare as ACC Casian Pewe in Grace, wearing a police uniform and hat
Sam Hoare as ACC Cassian Pewe in Grace. Tall Story Pictures for ITV and ITVX

Who is ACC Cassian Pewe? Cassian Pewe is the ACC in Brighton, and he has a long-running feud with Grace.

Where have I seen Sam Hoare before? Hoare stepped into the role previously played by James D'Arcy. He is known for appearing in series such as Miss Scarlet and the Duke, The Capture, Showtrial, Death in Paradise, Outlander, The Castaways and Dalgleish.

You can purchase the Peter James Roy Grace books which will be adapted for season 4, Dead Man’s Time, Want You Dead, You Are Dead and Love You Dead on Amazon now.

Grace season 4 will air on ITV1 and ITVX from 8pm on Sunday 1st September.

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