Marnie Simpson threatened to quit Celebrity SAS: Who Dares Wins as she took on a terrifying heights task during Monday night's episode of the show.

The Geordie Shore star, 32, complained that she had 'nothing left' amid the gruelling course after having to race abseil down a 300-foot dam.

She was slammed by viewers for 'whining' during the episode while the instructor accused her of crying 'crocodile tears' and showing 'total disrespect'. 

It comes after John Barrowman left the show after just 32 minutes when he threw up in the first task.

Marnie said when she got back to their accommodation after the task: 'I've got nothing left, I am in so much pain, how do I tell them that I want to go home?'

On X many viewers were sick of her reaction as they penned: 'Marnie needs to reel in her attitude......it's going to be her undoing #SASWhoDaresWins.',

'Marnie is whinging with a smirk on her face. Wanting a bit of attention #SASWhoDaresWins.',

'Well go then Marnie you won't be missed #SASWhoDaresWins.',

'Why Marnie signed up for this is beyond me #SASWhoDaresWins.',

'Does Marnie think that everyone says please & thankyou in the SAS - deluded! Stop moaning - what did she expect?! #SASWhoDaresWins.',

'We're all in pain listening to you moaning Marnie #SASWhoDaresWins.',

'Oh Marnie, you can't breathe yet you are screaming at the top of your lungs and 'gasping, yes breathing #CelebritySAS.'

It comes after fellow recruit Rachel Johnson slammed Celebrity SAS for allowing Marnie to take part in the show with 'open wounds on her chest.'

The sister of former Prime Minister Boris, 59, who broke a rib just two days in, said it was 'agony' for her to watch Marnie complete the tasks as she was 'physically fragile.'

Marnie had undergone a breast uplift just weeks before flying out to New Zealand for the quasi-military training show and still had post operative dressings on. 

She was forced to leave the series and her wounds became infected, with Rachel saying 'if she was my daughter, she would not be here, no way.'

Speaking to MailOnline and other press Marnie admitted: 'Mentally and physically I just wasn't ready for it.'

Rachel said: 'I was really worried about Marnie. I felt that she shouldn't have been there and it was agony for me to see her go what she went through. Knowing that she was quite fragile physically.'

Marnie added: 'I loved Rachel for it. I feel like we really bonded. She made me feel safe. I've always wanted to do the show. I got the call three weeks before it started that I'd got the job and I was ecstatic. 

'But I'd had a baby ten months prior and I had a really bad delivery so I had a really bad C-section scar. But then I'd also had a breast uplift and three weeks after that, you don't want to be doing any kind of boot camp activity. 

'I thought I was healed enough, which is delusional, I just assumed it wouldn't be intense as it was. Then travelling all that way. That's probably why I didn't go as far as I would have liked because I was physically not in a good way at all. 

'It was such a hard decision to leave but I'm really glad I made it because when I got home, I had an infection in my boob, it wasn't good and I think any longer it would have been not a pretty scene. 

'I regret, I wish I had done a different season when I was physically and mentally ready. I wish I had waited.

'Luckily I got home and I could put the correct dressing on. We were in and out of water a lot and there was no showers because they were all frozen so it was really hard to look after yourself. There was no necessities that I needed.'

Rachel continued: 'I don't think she should have been there and I thought it was irresponsible because she still had her post operative dressings on.'

She added: 'When I went down in the dam, I broke a rib. I had to watch Marnie go down in the dam knowing that she had open wounds on her chest and I was like, 'What the actual f***'. 

'I remember seeing her screaming and I was thinking, if that was my daughter, she would not be here, no way.

'I broke a rib coming down the dam which was day two and that's why I completely panicked when I saw Marnie. We were not prepared, it would take someone weeks of training to do what we did straight away on verbal instructions. 

'I saw a doctor, they don't show this I'm sure, I went a couple of times because I was in such pain with it. I was dealing with a broken rib from day two. I was in so much pain and I just powered through. I was surprised a doctor would have passed Marnie to do what we had to do.'

Marnie explained: 'We all had to have a medical done. And I did pass the medical so I think what happened was, we were travelling for 36 hours and I didn't change my dressing in the full 36 hours in the travelling time to New Zealand and that caused irritation so annoyingly you're not supposed to have silicon on a new wound for longer than six hours and I had it on for 36. 

'I caused the scars to become irritated and inflamed. Then ultimately going on the show is what caused the infection but the travelling time made it worse.' 

Channel 4 added: 'Contributor care and their health and welfare is of paramount importance and all celebrities have to go through strict health and safety protocols to ensure they are mentally and physically robust enough to take part in the course. 

'Marnie was cleared by the production's medical team, who consulted Marnie's doctors as part of this process, and were satisfied that she was able to take part.'

Rachel and Marnie are joined by Bianca Gascoigne, former England rugby captain Chris Robshaw, TV Presenter Cherry Healey, former professional boxer Anthony Ogogo, comedian Shazia Mirza, former Love Island contestant Georgia Harrison and reality star Bobby Norris. 

The line-up was completed by Torchwood star John Barrowman, TOWIE's Pete Wicks, former Olympic gymnast Ellie Downie, comedian Tez Ilyas, professional basketball player and former Love Islanders Chloe Burrows and Ovie Soko, as well as World Heavyweight Champion boxer Lani Daniels.

Chief instructor Billy Billingham has also returned with his team of directing staff Foxy (Jason Fox), Rudy Reyes and Chris Oliver, while they are joined by former Special Forces psychologist Dr Alia Bojilova.

The show will see contestants exposed to constant cold and wet as they undertake an array of SAS training exercises.

Speaking of the new series, Billingham said: 'As our course progresses, the standards expected will never faulter.

'From the very first second, the recruits will be expected to give 100%.

'Anyone not doing so will be gone before they have time to make their excuses. Our time is invaluable - we will not waste it on anyone not worthy.'

Series six of Celebrity SAS: Who Dares Wins will air on Channel 4 every Sunday and Monday from September 22, at 9pm.