Jimmy Carr hosts as team captains Sean Lock and Jon Richardson join forces with Jason Manford and Roisin Conaty respectively. Sam Simmons helps the show's resident lexicographer Susie Dent in Dictionary Corner, while Rachel Riley looks after the numbers and letters.

Jimmy Carr invites Sean Lock and Rob Beckett to go up against Jon Richardson and Cariad Lloyd in the comedy panel show's version of the words-and-numbers quiz. Jamie Laing joins Countdown's resident lexicographer Susie Dent in Dictionary Corner, while Rachel Riley looks after the numbers and letters

Jimmy Carr invites Sean Lock and Miles Jupp to go up against Jon Richardson and Sara Pascoe in the comedy panel show's version of the words-and-numbers quiz. Sam Simmons joins Countdown's resident lexicographer Susie Dent in Dictionary Corner, while Rachel Riley looks after the numbers and letters.

Jimmy Carr hosts while Sean Lock and Isy Suttie take on Jon Richardson and Richard Osman. Alex Horne and the Horne Section are in Dictionary Corner with Susie Dent and Rachel Riley.