One of the biggest stars in the new series of Celebrity SAS: Who Dares Wins has reportedly quit after less than an hour of filming.

John Barrowman walked out of the Channel 4 series after just 30 minutes on the first day of filming, according to reports.

While the Torchwood star, 56, is not the only celebrity to throw in the towel on the gruelling show, his reported exit would make him the fastest quitter in the series' history.

Speaking to The Sun, a source said: 'They’d all got kitted up in their uniforms and had started filming in New Zealand when he chose to walk out.

'It is an incredibly mentally and physically challenging television show and the task they were facing was difficult. Most of the stars were shocked when after 30 minutes John said he did not want to take part any longer.

'He left pretty much then and there. It was all a bit strange and naturally, the producers who make the show weren’t best impressed to see one of their biggest stars turning on their heel and quitting before an hour was up.'

They add that John is thought to have returned to the hotel where the stars quarantined, before going back to the UK. 

John had been filming in New Zealand allegedly alongside stars such as Love Island alumni Ovie Soko, TOWIE star Pete Wicks, Geordie Shore's Marnie Simpson and gymnast Ellie Downie.

The show will see the celebs physically and mentally put to the test by instructors Billy Billingham, Jason Fox, Rudy Reyes, and Chris Oliver. 

It was due to be John's big TV comeback after ITV sacked him from Dancing On Ice in 2021.

John issued an apology after responding to historical claims of 'inappropriate behaviour' on the set of BBC drama Torchwood.

John - who was replaced by Oti Mabuse on the skating show - insisted the controversy surrounding his past antics was 'exaggerated' as he gave his first interview since being sacked.

Speaking in an interview with Lorraine in November 2021, he said: 'All the people that are making the fuss about it, they weren’t there, they don’t know the context of things that were done.'

John described his past actions as 'silly behaviour' and insisted that he would 'never do it now' after previously admitting to 'tomfoolery' on the sets of Doctor Who, where he began playing Captain Jack Harkness in 2005 and spin-off series Torchwood a year later.

He explained: 'I think that if it was now, it would be crossing the line. I think that something that happened 15 years ago, it was bawdy behaviour, silly behaviour, it was being done in the confines of the set, and we were like a family, working together.

'The fact that it was stories that I’ve already told. I’ve been telling them for years. I haven’t hidden anything, they’ve been exaggerated, and they’ve tried to turn them into sexual harassment which it absolutely is not.'

He added: 'The one thing for me, all the people that are making the fuss about it, they weren’t there, they don’t know the context of things that were done. The continued bashing is not good. We've moved on.

'Like I said, I would never do it now but what we’re not allowing people and myself to do… we’re not allowing people to learn to adapt and to change, and that’s the most important thing.'