Jimmy Carr hosts the anarchic letters and numbers mash-up, with Countdown regulars Susie Dent and Rachel Riley. Jon Richardson and Harriet Kemsley take on Lee Mack and Munya Chawawa, while David O'Doherty joins Susie in Dictionary Corner.

Rob Brydon and Katherine Parkinson take on Jon Richardson and Babatunde Aléshé. Adam Buxton joins Susie in Dictionary Corner, while Joe Wilkinson helps Rachel with the numbers in his own inimitable fashion.