What's more, is that Danny John-Jules is back as the beloved Officer Dwayne Myers to help out DI Neville Parker (Ralf Little) in another deathly mystery on the Caribbean island.
The festive rendition is part of the BBC's Christmas scheduling and will mark the end of series 10 and the show's tenth anniversary celebrations before the next season hits our screens in January 2022.
The episode will be feature-length and "stretches from a grey damp drizzly London all the way to the warm sparkling beauty of idyllic Saint Marie".
The BBC have said: "It’s Christmas time on Saint Marie and Neville is preparing to head to Manchester to spend the holiday with his family. But his plans are abruptly changed when a billionaire shipping magnate dies in mysterious circumstances.
"Things only get stranger when a minicab driver in London receives a Christmas card with an ominous message inside that turns the entire case on its head. For Neville and the team, will this be a case they can crack together?"
The Christmas special will also follow on from THAT series 10 cliff-hanger with Florence getting off the island for Christmas and the department is left a person down. Cue retired officer Dwayne Myers to make a comeback and help out the gang.
The BBC have also said about the Christmas special: "Alongside Marlon, Dwayne employs his unique style of policing to help investigate the case. Left to their own devices, the pair struggle on the best plan of action for apprehending a suspect. As rain falls, tensions rise - but as Christmas Day approaches, will they realise they’re more like one another than they originally thought?"
There's been no exact date or time announced yet but in this one-off episode, we'll also have cameos from Mathew Baynton (Ghosts), Juliet Stevenson (Riviera), Stanley Townsend (Informer), Jocelyn Jee Esien (Jack & The Beanstalk: After Ever After), Anthony Calf (Poldark), Tessa Bonham Jones (The Trial of Christine Keeler), Elizabeth Tan (Emily in Paris) and Tariq Jordan (Law and Order: UK).
Get the turkey sandwiches made up already and the cringey festive jumpers on, we're too excited to cuddle up for our festive viewing.
The BBC full-festive line-up can be viewed here.