Quizmaster extraordinaire Richard Osman presents a festive treat as he presides over this special Christmas edition of Child Genius. Four celebrities go up against four of the most formidably talented competitors in Child Genius history, as the teams bid to prove who is the brightest. Stretching their intellects and powers of concentration to the max, can Comedian Jimmy Carr, TV presenter and author Rick Edwards, newsreader Charlotte Hawkins, and comedian Shazia Mirza take on the Child Geniuses and actually win? The Child Genius team is 14-year-old multi-linguist Mog; 14-year-old maths prodigy David, who thrashed Countdown's maths queen Rachel Riley in a maths-off when he was just 12; maths whizz Aliyah, who is just 12 years old and thinks celebrities' brains 'are a bit slow'; and team captain and last year's Child Genius winner, 13-year-old Rahul - who has an IQ higher than Einstein's.