The first sneak peak at The Celebrity Traitors reveals that the stars are in for a grim time in the castle - with the missions including coffins and pipe-tunnels in which they are trapped.
A short clip showed a picture of a coffin with the lid closing, which suggests that one of the missions will involve the stars being buried alive.
And another of the fearsome challenges, in which the stars must work hard to build up their charity prize post, will involve a pipe-style tunnel with a grate which can come down at any moment - trapping the celebrities inside and ending their involvement in that mission.
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At the start of the first episode, to air on BBC1 in October, Olympian Tom Daly makes the extreme declaration: “I’m going to fight to the death.”
Looking equally serious, actress Celia Imrie declares: “I’m here to win.” And Alan Carr seems surprised as he confesses: “Maybe I have got a dark side.” But Stephen Fry seems a bit more relaxed as he reclines in a chair and admits: “I don’t know what beast lies within me.”
In the clip, shown at the Edinburgh TV Festival, sports presenter Clare Balding is also shown looking forward to the missions, or perhaps just the round-table deliberations, as she says:: “Let the games commence.”
In the video host Claudia Winkleman says: “They think they know what they’ve signed up for. They’ve got no idea.”
BBC head of unscripted Syeda said she was worried that the stars wouldn’t enter into it with the same level of commitment as the regular contestants.
“We had nothing to worry about,”she said. “Some of the things you’ll see them do are extraordinary.” She said that by the end, some of the famous faces felt they’d never be the same again. “Some of the celebrities said at the end that they were quite changed by it.”
Kate Phillips, the new boss of BBC content, said she’d now watched the series and was astonished by what she’d witnessed. “I thought ‘I can’t believe what I’m seeing them doing’.
The celebrity edition of the game of deception and betrayal will also include singer Charlotte Church, TV presenter Kate Garraway plus chat show host Jonathan Ross, singers Paloma Faith and Cat Burns and former England rugby player Joe Marler.
A total of 19 famous faces gathered for filming at Ardross Castle in the Scottish Highlands earlier this summer or the chance to win a cash prize of up to £100,000 for a charity of their choice.
Claudia has 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.”
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