Filming of the third and final series of the drama has begun, and will continue shooting in Dorset, Bristol and Somerset throughout the summer.
Sarah Parish, Charlie Higson, Roy Hudd and former Coronation Street star Julie Hesmondhalgh will also appear in the eight-part series.
David Tennant and Olivia Colman will return as DI Alex Hardy and DS Ellie Miller.
The show will see the detectives reuniting to investigate a serious sexual assault, ITV said.
"Broadchurch's final chapter looks at the emotional cost to all of those involved and the irreparable damage to friendships and relationships," the network said in a press release.
Writer Chris Chibnall said: "We have one last story to tell, featuring both familiar faces and new characters. I hope it's a compelling and emotional farewell to a world and show that means so much to me."
Dorset-based organisations who specialise in dealing with victims of sexual assault and police advisers have been assisting Chibnall with scriptwriting.
After Broadchurch ends, Chibnall will be moving to replace Steven Moffat as the head writer and executive producer for BBC One's Doctor Who.
Broadchurch launched in April 2013 and reached a peak audience of 8.9 million viewers.
It went on to win Bafta and RTS awards, and a second series was shown in January 2015.

Encore: Movie Partners Sing Broadway, a collection of show tune duets featuring Hugh Jackman, Jamie Foxx and others, is her seventh number one album in the UK.
Encore recorded 20,000 combined sales, the Official Charts Company said.
In the singles chart, The Chainsmokers go top with Closer, the DJ duo's collaboration with US singer Halsey.
The Chainsmokers, aka Andrew Taggart and Alex Pall, said they were "beyond grateful at all the support from our UK fans".
"As a relatively new artist, it means a lot to us and gives us a lot of confidence in the music we have coming up," they said,
DJ Snake and Justin Bieber's Let Me Love You remains at two for the fourth straight week, one place above last week's number one record.
After five unassailable weeks in pole position, Cold Water - from Major Lazer and featuring Justin Bieber and MÃ˜ - drops to number three.
Calum Scott's Dancing On My Own and Twenty One Pilots' Heathens are non-movers at four and five respectively.
Twenty One Pilots occupy the same spot in the album chart, thanks to the US duo's fourth album Blurryface jumping six places to five.
The remainder of the top five is made up of Frank Ocean's Blonde at three, and Dolly Parton's Pure and Simple at four.
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A victim is taking legal action to force an independent inquiry with power to compel witnesses and the security services to hand over documents.
Gary Hoy was abused by two men who were subsequently convicted.
There have been allegations that a paedophile ring at Kincora was linked to the British intelligence services.
The government has so far refused calls for the abuse scandal at the Belfast home to be included within the scope of the inquiry established by Home Secretary Theresa May and headed by New Zealand judge Lowell Goddard.
The government has said that as child protection is a devolved matter, the right place for the Kincora allegations to be examined is Northern Ireland's Historical Institutional Abuse Inquiry, which has been sitting in Banbridge.
The victims of Kincora claim the Northern Ireland inquiry lacks the powers to compel evidence or witnesses from government agencies.
Amnesty International, which is supporting the victims' legal challenge, says two military intelligence officers have alleged that the security services blocked police investigations into the child abuse at Kincora in the 1970s.
The judicial review is expected to last several days.
Three senior care staff at Kincora were jailed in 1981 for abusing 11 boys.
At least 29 boys were abused at the home between the late 1950s and the early 1980s.
One of the men who was later convicted, William McGrath, is believed to have been an MI5 agent.
Sir Lenny Henry is to join the cast of Broadchurch, ITV has announced.
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Glory, Britney Spears' latest release, has been beaten to the top of the UK album chart by the 35th studio album from US music veteran Barbra Streisand.
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A judicial review has begun over the decision to exclude the former Kincora boys' home in east Belfast from a child abuse inquiry being held at Westminster.