Rylan, Emma Willis and Oti Mabuse are taking on the Cairngorm Mountains in the Scottish Highlands, all for a good cause.
The trio will take part in the gruelling challenge to raise money for Comic Relief ahead of Red Nose Day on March 17.
The celebs will trek across the Scottish Highlands for three days and their adventure will be captured for a special documentary, which will air on BBC One and iPlayer.
