LINE Of Duty's Craig Parkinson has warned the season six finale will "frustrate fans" and "break hearts".
The actor confirmed he has seen the concluding episode – but kept tight-lipped and declined to confirm the identity of H.
However Craig, who played DI Matthew 'Dot' Cottan in the hit BBC crime drama, has hinted the ending might not please everyone.
Speaking on the Dermot O’Leary’s BBC Radio 2 show, Craig revealed what fans can expect from the series finale without giving away any spoilers.
When asked by host Dermot if viewers were “in for a belter”, actor Craig shared: "I think it’s gonna shock people.
"I think people are going to be frustrated, it’s exhilarating, it’s exciting… these aren’t soundbites, I’ve seen it four times, honestly, and it really stands up to repeat viewing."
He also said the characters were about to "break hearts".
On the cast and crew filming in lockdown, he explained Sky News' Backstage Podcast last night: "I'm so proud of the guys for going back after the break, getting it done without any illness and delivering one of the iconic great British dramas that we've produced in the past few years.
"Talk about timing, we all need AC-12 in our life right now, albeit I'm sure they're going to break some hearts at some point."
The action is building up to reveal the name of H – the fourth person in an organised crime group that includes corrupt top cops within Central Police.
So far viewers have learned Matthew “Dot” Cottan, Derek Hilton and Gill Biggeloe are the other three bent figures within the force.
The main suspects in the firing line are Jo, Supt Ted Hastings, DCS Patricia Carmichael, CC Philip Osborne, DCI Marcus Thurwell and Det Supt Ian Buckells.
Line of Duty series six concludes Sunday at 9pm on BBC One.
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