Little Britain star David Walliams is to host a 24-hour panel game show to raise funds for Comic Relief.
24 Hour Panel People will be a live online event that will then be edited down for broadcast on BBC Three in the run-up to Red Nose Day on 18 March.
Other comics taking part include Jason Manford, Sean Lock and Leigh Francis.
"This is an amazing challenge," said Walliams of the marathon, to take place on 5 and 6 March. "I just hope I don't fall asleep or burst into tears."
Have I Got News for You, Never Mind the Buzzcocks and 8 Out of 10 Cats are among the panel show formats that will be featured in the event.
Walliams, 39, previously swam the English Channel and the Strait of Gibraltar to raise money for the Sport Relief campaign.
Proceeds from 24 Hour Panel People will go to Comic Relief, which tackles poverty in the UK and Africa.