Derry Girls' Siobhán McSweeney and Coronation Street's Les Dennis will guest star in the second festive special of BBC One's Death in Paradise.
No details of their characters have been revealed.
This season's special sees the police team in the Caribbean crime drama investigating the murder of a true crime podcaster on the hunt for a missing child.
The feature-length episode will have another storyline where Commissioner Selwyn Patterson, played by Don Warrington, has an old case come back to haunt him.
Meanwhile, love could be on the horizon for DI Neville Parker, played by Ralf Little.
The episode also features officer Marlon Pryce, played by Tahj Miles, having to spend the night in a haunted house as Darlene Curtis, played by Ginny Holder, takes a hard look at her life choices.
In the upcoming 12th series of Death in Paradise, episodes will cover the death of a celebrity astronomer and people digging for the apocalypse on a hillside of the show's fictional Caribbean island, Saint Marie.
Peep Show actor and comedian Robert Webb, Jo Martin, who portrayed a version of the Time Lord called the Fugitive Doctor on Doctor Who, Happy Valley's Amit Shah and Jo Hartley from the Ricky Gervais comedy After Life are among the guest stars coming up on the hit show and special.
Barney Walsh, who has starred opposite his father Bradley Walsh in the comedy-drama The Larkins, is another name on the credits.
There will also be appearances by Coronation Street's John Michie, legal drama The Split's Fiona Button, Kate and Koji's Okorie Chukwu, The Outlaws' Gamba Cole and Downton Abbey's Cara Theobold.
Series 12 will be broadcast shortly after the Christmas special in the new year.
A spin-off show, Beyond Paradise, starring My Family's Kris Marshall and Not Going Out's Sally Bretton, will also be released in early 2023.
Source: Press Association
