Jimmy Carr hosts this edition with captain Jon Richardson and special guest captain Lee Mack who are joined by celebrity guests Bob Mortimer and Adam Hills. Countdown regular Susie Dent is in Dictionary Corner with help from Alex Horne and the Horne Section while the country's favourite boffin, Rachel Riley, provides the letters and numbers with a little help from comedian Joe Wilkinson.

Jimmy Carr hosts. Sean Lock and Mel Giedroyc vs guest captain Lee Mack with David O'Doherty. Susie Dent is joined by Adam Buxton in Dictionary Corner, with Rachel Riley.

Jon Richardson and Joe Wilkinson take on Lee Mack and Katherine Ryan. Brett Domino is in Dictionary Corner. Jimmy Carr hosts, with Rachel Riley and Susie Dent.