Line of Duty 's balaclava man has been unmasked as shadowy underworld figure John Corbett, with links to conspiracy kingpin 'H' and a long line of corrupt cops.
He's being played by actor Stephen Graham, who's been a regular face in film and TV over the years.
Graham, 45, is best known for his role as Andrew 'Combo' Gascoigne in 2006 film This Is England and its three TV sequels.
He also played Tommy in Guy Ritchie's hit 2000 movie Snatch, opposite Brad Pitt and Vinnie Jones.
His other Hollywood credits include roles in Gangs of New York, Public Enemies, Tinker Tailor Soldier Spy, Yardie and the Pirates of the Caribbean franchise.
Graham also played crafty pirate Scrum in the fifth and sixth films opposite Johnny Depp.
As well as his movie work, Graham is also a familiar face on TV.
Line of Duty cast Stephen Graham - has a potential suspect in the new series been revealed?
Graham started his career in the 1990s winning roles in shows such as Children's Ward, Heartbeat, Coronation Street and The Bill.
In more recent years, he's been seen in a series of hard-hitting dramas.
Graham starred in Little Boy Blue , the 2017 ITV series about the real life murder of Liverpool schoolboy Rhys Jones, who was shot aged 11 in 2007.
Line of Duty's balaclava man unmasked - who is he and what are his crimes?
He played the top cop in charge of the investigation, Detective Superintendent Dave Kelly, and even met his real life counter-part to discuss the role.
Ironically one of his most recent TV roles was in Sky Atlantic drama Save Me - alongside another former Line of Duty star.
Graham was paired onscreen with actor Lennie James, who starred in the first series of Line Of Duty as troubled copper DCI Tony Gates.
He also appeared with Line Of Duty's Vicky McClure in 2016 BBC drama Secret Agent.
Line of Duty returns tonight at 9pm on BBC1.Do you have a story to sell? Get in touch with us at webcelebs@trinitymirror.com or call us direct 0207 29 33033.
