Richard Osman presents this festive treat, a Christmas gift for all, as four of the show's most formidable past competitors take on four of the country's finest celebrity minds in a test to see who has the brightest brains this Christmas. 

Jimmy Carr leads the celebrities through demanding tests of spelling, maths, memory and general knowledge.

Only one team can be crowned Christmas champions – who will have the final sleigh and end up on the top of the Child Genius Christmas tree this year?