The trio are up for a bushtucker trial titled Grot Yoga in Tuesday's episode of the ITV contest, where they have each been shut into an enclosed glass space and are asked to perform yoga poses.
Read more: All the winners of I'm A Celebrity so far
But they'll have to work harder than usual to stay zen as a first look clip from the trial shows Boy George being covered in rotten fruit and veg, and his two campmates in offal as they hold the pose while chanting.
Watch: Boy George, Seann Walsh and Mike Tindall in Grot Yoga
Hosts Ant and Dec tell the celebrities that they must hold a pose that they have renamed "burrowing cockroach" for a minute as the disgusting slurry is tipped over them.
Dec explains: "Offal in there with Mike and Seann, George has rotten fruit and veg...as he's a vegetarian."
He then jokes: "Not only are they ohming, they're absolutely humming."
While comedian Walsh appears to be struggling with the offal as he screams, singer Boy George manages to keep his cool by chanting, something he has been shown doing every morning and during trials while in the jungle.
Meanwhile, ex-rugby player Tindall continues to look unbothered by any part of the trial as he holds the pose without complaint.
The trio are aiming to win a reduced number of stars as celebrities have now begun leaving camp, meaning there are fewer mouths to feed each day.
On Monday, viewers saw Coronation Street star Sue Cleaver become the third campmate voted out, following Scarlette Douglas on Sunday and Charlene White on Friday.
While in the jungle, Cleaver had spoken about being adopted and shared the incredible story of how she had found her birth mother while working in a theatre, where she happened to be cast alongside another actor who said she was the double of his wife.
On Tuesday, Cleaver told Good Morning Britain she hadn't meant to discuss her adoption, but said: “I have been quite private, I have never spoken about that out of respect for everyone but I felt so comfortable in there with those people and (sisters) Emma and Kate, my brother and my mum said say whatever you feel, what you’re happy to feel, so I did.
“I think the one thing the world will realise about me is I don’t have a filter. You completely forget that the cameras are there.”
I'm A Celebrity airs the full trial tonight at 9pm on ITV.
Watch: Prince William can't choose between Mike Tindall and Jill Scott for his I'm A Celeb pick