The first series of the Celebrity Traitors is set to air in October, the BBC has confirmed.
About 19 famous faces will compete in the game of deception and betrayal in the Scottish Highlands to win up to £100,000 for a charity of their choice.
The celebrity edition will see stars including actor and broadcaster Sir Stephen Fry, Olympian Tom Daley, singer Charlotte Church and TV presenter Kate Garraway.
The show, set in Ardross Castle, will also feature actress Celia Imrie, comedian Alan Carr, presenter Jonathan Ross, broadcaster Clare Balding and singer Paloma Faith.
A handful of contestants, known as traitors, pick off their castmates, known as the faithful, with nightly “murders”.
Meanwhile the faithful try to work out their identity. If any traitors remain at the end, they win the cash prize.
The third series of The Traitors, which aired in January, attracted more than 10 million viewers.
The BBC said the long-awaited spin-off of the hit show would be “extraordinary”.
Speaking at the Edinburgh TV Festival, the BBC’s unscripted director Syeda Irtizaali said: “It was a real pleasure to cast this series.
“We wanted to have a really broad range of people, but we also wanted people that were real fans of the show, that really understood it.
“I’m not going to say it was easy. Roz, who put the cast together, did an amazing job – but we were pushing on a bit of an open door with most of them.”
The director said she was initially worried about how the celebrities would play the game compared to members of the public who featured in the first three series.
She added: “But we have nothing to worry about.
“They really play the game and some of the things that you’ll see them doing is extraordinary, that’s all I’m going to say.
“It’s well worth the wait.”
Ms Irtizaali said that a lot of the celebrities had said they were “changed” by appearing on the show.
Other stars joining the group at the castle are former England rugby player and podcaster Joe Marler and singer Cat Burns.
Host Claudia Winkleman previously said: “We’re incredibly lucky these brilliant people have said yes.
“I’d love to say we’ll take it easy on them and they’ll just wander round the castle and eat toast for a couple of weeks but that would be a lie.”