The unlucky radio host will have to make their way through a submerged structure to collect stars representing meals for camp.
Of course, he won't be alone, with snakes, crabs and baby crocs among the creatures lurking in the depths.
Hosts Ant and Dec explained: "One celebrity is about to plunge in to the depths of despair, racing through a series of underwater chambers.
"Endless horrors await in room after terrifying room when you take a trip to the Temple of Gloom."
As always, it was up to viewers to decide who would take part.
All of the campmates were eligible for tonight's vote except Stanley Johnson and Rebekah Vardy, who were ruled out on medical grounds.
Ant and Dec announced that Iain topped the vote in their daily visit to camp, after teasing Jamie Lomas that it 'might be you'.
Temple of Gloom will be the first Bushtucker Trial since the split camps merged back together yesterday.
The two sides went head-to-head in a series of challenges. However, a sneaky twist meant that Croc Creek had to win them in ordr to earn care packages for their unsuspecting Snake Rock rivals.
I'm A Celebrity 2017 continues tomorrow at the slightly later time of 9.10pm on ITV.