Suranne Jones will play Claudia Winkleman and David Walliams will play plotter Paul in The Traitors: The Movie for Comic Relief.
Catherine Tate, Sally Phillips, Iain Stirling and Jonathan Bailey will also appear in the sketch spoofing the hit BBC show.
Smack The Pony star Phillips will play faithful contestant Diane, who was ruthlessly murdered with a glass of fizzy rose in the series by Miles, who will be played by Ghosts’ Kiell Smith-Bynoe, and whose “funeral” was a viral moment.
Love Island narrator Stirling will play her son Ross while People Just Do Nothing star Chaudhry will play super-sleuth Jaz, whose suspicions about traitors were constantly ignored.
Bridgerton actor Bailey will play traitor Harry, who triumphed in the series to steal the cash prize after he tricked his friend Mollie, who will make a special cameo in the sketch playing herself.
Tate will also take on the role of Evie, or possibly Charlie, a reference to the fact viewers struggled to tell them apart in the series, while Gentleman Jack star Jones will play series host Winkleman and Little Britain’s Walliams will play villain Paul, who was ultimately banished after hiding in plain sight as a traitor.
Jones said: “I’ve grown up with Comic Relief and every year I think I must do something, so it’s an absolute thrill to be cast.
“I watched The Traitors and I love Claudia, so everything is done with love as I step into her shoes. The most important thing is we are raising money for really important causes. So, we are having fun, but the main thing will always be the causes.”
Bailey said: “Being invited to be in a Comic Relief night of TV sketch is the proudest moment of my career so far.
“On top of that, The Traitors is my all-time favourite TV series – I would be star-struck if I met any one of them. I’m sure I am the first in a long line of actors who will play Harry in biopics. Actually, I want to take this moment to publicly apologise to Harry for what I’ve done.”
The Traitors: The Movie will air on Comic Relief: Funny for Money on March 15 from 7pm, on BBC One and BBC iPlayer.