Line of Duty fans were stunned when Nigel Boyle appeared on This Morning - looking totally different to his character Ian Buckells.
H's identity was finally revealed in the series finale of the BBC drama.
DCI Ian Buckells, played by actor Nigel, was revealed as the mystery character in Sunday's episode.
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The future of anti-corruption unit AC-12 was also left hanging in the balance at the end of the show.
Speaking about being the 'fourth man' and keeping his identity a secret, Nigel was interviewed on This Morning.
But viewers and Phillip Schofield were taken aback by his appearance.
While his character DCI Buckells has short hair and freshly shaved skin, Nigel looked more youthful on This Morning with his long hair and tamed beard.
Phil said: "You don't look anything like him [DCI Buckells]."
Fans on social media agreed, with Amy joking: "Ian Buckles what an absolute catfish."
Ryan wrote: "Ian Buckells looks kinda hot now."
Stephanie said: "He looks a lot younger on here than he does on Line Of Duty."
And Susan tweeted: "Nigel Boyle from #LineOfDuty on #ThisMorning. Looking different and cuter than Buckells."
The final episode of the sixth series of Line Of Duty was watched by an average of 12.8 million people, with a 56.2% share in overnight viewing figures, the BBC has said.
The episode had a peak viewing figure of 13.1 million, according to the corporation.
