Roisin Conaty, Kiell Smith-Bynoe, Lou Wall, Sam Nicoresti

Jimmy Carr hosts the comedy words-and-numbers quiz, with Jon Richardson and Roisin Conaty taking on new team captain Rob Beckett and Kiell Smith-Bynoe. Countdown regulars Rachel Riley and Susie Dent are on hand to adjudicate, with Susie joined by Lou Wall in Dictionary Corner.