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John Barrowman has left reality show Celebrity SAS: Who Dares Wins after just 32 minutes, telling an instructor he was "done".
The Doctor Who star could be seen vomiting shortly after contestants finished the first challenge in Sunday's opening episode of the Channel 4 show.
The celebrities had been set tasks based on SAS winter warfare training in the south islands of New Zealand.
As they put on their uniforms and got ready to see their accommodation, Barrowman, who has also held a number of major roles in West End musicals, started being sick and told the group "I'm out".
Asked by ex-SAS Sergeant Major Mark "Billy" Billingham if he would like to see a doctor, Barrowman, 57, replied: "No... I'm done," before adding: "I just... it's not for me, I know who I am and what I'm about, it's not for me."
The programme's narrator said: "After only 32 minutes on base, number 13 John is the first recruit to leave the course."
Barrowman was accused of flashing during production of both Doctor Who and its spin-off show, Torchwood, in which he appeared from 2005 to 2011, which he dismissed as "bawdy behaviour, silly behaviour."
His early departure leaves 14 celebrities chasing first place in the quasi-military training challenge series, won last year by singer Gareth Gates.
Among them are Rachel Johnson, sister of former prime minister Boris Johnson, reality star Pete Wicks, former Olympic gymnast Ellie Downie, comedian Tez Ilyas, professional basketball player and Love Island star Ovie Soko and world heavyweight champion boxer Lani Daniels.
Reality TV Star Bianca Gascoigne, former England rugby captain Chris Robshaw, TV Presenter Cherry Healey, former professional boxer Anthony Ogogo, comedian Shazia Mirza, Love Island contestant Georgia Harrison, reality star Bobby Norris and former Geordie Shore star Marnie Simpson complete the line-up.
The opening instalment of the sixth series of the celebrity spin-off show also saw The Only Way Is Essex star, Norris, 38, discuss his desire to overcome his fears and phobias and detail the online abuse he has faced.
He said many people get online abuse "and trolls and stuff", but called some of the videos made of him "disturbing" and "dark".
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His response, he said, was "filling my face with Botox, because really, it was like a mask. One day (it) just didn't feel like it suited me anymore. I wanted to just be happy in my own skin being me."