Graham Norton is to host a seven-hour chat show as part of Comic Relief.
The funnyman is booking up to 50 guests and singing acts for the marathon chat-a-thon and will take over BBC Three's entire schedule from 7pm to 2am on Friday 15 March.
It will take the format of his usual Friday night show although producers are planning a few surprises.
A source told The Sun newspaper: "This will be the most exhausting thing Graham has ever done. Seven hours of live telly is no mean feat, so Graham is booking people he knows will lift his spirits.
"There will be all the usual banter and silly clips and there will be some big set pieces too, which are being thrashed out now."
Stars such as David Walliams, Matt Smith and Miranda Hart are being lined up to take part and throughout the show, viewers will be invited to ring or text in donations to Comic Relief.
Graham's stunt follows former Radio 1 DJ Chris Moyles' marathon Comic Relief broadcast in 2011, when he was continually on air for more than 50 hours.