The 69-year-old actor starred as Danny Sheridan, a mysterious psychic with blonde dyed hair and a fake tan.
He joined the likes of Derry Girls’ Siobhan McSweeney and Bradley Walsh’s son Barney as they jetted off to Saint Marie.
Les’ character Danny became a prime suspect in the episode’s murder, with Ralf Little’s Detective Inspector Neville Parker returning to investigate.
However, viewers were distracted by Les’ new look, with one writing: ‘Last night watched Death In Paradise – @LesDennis was unrecognisable as a Scouse psychic grifter! Particularly enjoyed the hair dye.’
Viewers were stunned to see Les Dennis as the mysterious psychic (Picture: BBC / Red Planet Pictures / Denis Guyenon)
The 59-year-old had fake tan and dyed hair (Picture: S Meddle/ITV/REX/Shutterstock)
Another penned: ‘Been sitting there watching Death In Paradise special saying to myself I know that guy, took me 50 mins to work out I’m pretty sure it’s Les Dennis! I need to be better!’
‘@LesDennis I’m just catching up on #DeathInParadise !! I had to rewind to check the credits I literally shouted out loud is that Les Dennis. fantastic!!!!!!’ someone else wrote.
Ahead of the episode, Les had told press, having seen some of the fan reaction to his new look after posting a teaser on social media: ‘I was really surprised by it. At the moment, I’ve got a full ‘tache for Granddad in Only Fools and Horses.’
He continued: ‘So whenever I play a different character, I will sometimes change the way I look. But I suppose it was the black hair of Danny Sheridan…kind of deranged Jack Nicholson, I think, how can you get more deranged than Jack Nicholson anyway?
‘I was pleased with that, because it means that I’m inhabiting a role, and they’re interested to see who that character is.’
Les added that the hair dye took a lot of maintenance, forcing him to ‘be in makeup for about an hour and a half’ in the morning and admitting ‘it was very tricky to get out every night.’
Les revealed that the look required a lot of maintenance (Picture: BBC / Red Planet / Denis Guyenon)
‘I loved the fact that at first, I didn’t realise they were going to make my character look so different. On the first day I was thinking, “is this right?”
‘When I saw what they did, the makeup department were just brilliant.. This is Danny Sherid.’
The show’s second-ever festive spectacular had a real spooky element to it, with the BBC teasing: ‘Christmas in Saint Marie takes a spooky turn this year when an old case of Selwyn’s comes back to haunt him following the murder of a true crime podcaster on the hunt for a missing child.’
The synopsis continues: ‘Marlon is forced to spend the night in a haunted house and Darlene takes a hard look at her life choices. And after a chance encounter in an airport car park, could love finally be in the air for Neville Parker?’
Death in Paradise is available to watch on BBC iPlayer.
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Les’ dyed hair and fake tan stunned viewers.