Line of Duty fans finally had confirmation of who Jo Davidson was related to on the BBC drama on Sunday night.
AC-12 have been probing the dodgy cop over her handling of the Gail Vella murder case, while former AC-12 officer Kate Fleming is on her team after her mystery job change.
But there was a huge shock in store for Steve Arnott and the gang, when they uncovered the answer to the question viewers have been desperate to work out all week.
They found out who Jo was related to and what its significance was - and it was a cracker.
Jo was confirmed to be linked to none other than series one OCG leader Tommy Hunter, who was a major character way back when.
He was killed off in series two, so how does this all tie in with current goings on?
The episode revealed she was a partial DNA match for Tommy, before Steve added: "That’s not the worst of it. There’s an unusually high percentage match."
Steve explained the genes appeared to be those inherited from parents, potentially suggesting Jo could be a sibling of Tommy - but no confirmation was given.
But some viewers confessed they had no idea who Tommy was, and had forgotten all about him - so the twist fell flat.
While many were cheering and others revealed they had worked it out already, others kept asking who the character was.
One fan wrote: "WHO IS TOMMY HUNTER WHAT THE F**K IS HAPPENING."
Another agreed: " Google creaking under the weight of people searching for Tommy Hunter."
A third added: "ngl i did have to google who tommy hunter was. it's been a while."
Tommy was the original leader of the OCG, involved in the death of Jackie Laverty - an associate of his - as well as three drug dealers in series one.
Jackie's lover DCI Gates was blackmailed by him over the murder before Gates managed to prove it was Tommy and his gang who were behind the murders.
Tommy was a peadophile, and he groomed DI Cottan when he was a teenager, before Cottan joined the police force so that the OCG had someone on the inside.
But after Cottan convinced him to become an informant after his crimes, with him getting immunity as a result, he was placed in witness protection.
As he was being escorted from his safehouse over a threat in series two, his car was ambushed and he was shot and set on fire - before he was killed in hospital.
Line of Duty airs Sundays at 9pm on BBC One.