Jimmy Carr hosts the irreverent quiz, with team captains Sean Lock and Jon Richardson joined by David Mitchell, Katherine Ryan and David O'Doherty. Countdown regular Susie Dent presides over Dictionary Corner, while comedian Joe Wilkinson 'helps' maths expert Rachel Riley with the letters and numbers.

Jack Whitehall and Roisin Conaty join host Jimmy Carr and team captains Sean Lock and Jon Richardson for more comic innuendos, unpredictable conundrums and unforgivable puns in the comedy panel show's version of the words-and-numbers quiz. Rob Beckett is with Countdown's resident lexicographer Susie Dent in Dictionary Corner, while comedian Joe Wilkinson is back to 'help' Rachel Riley with her mathematical sums and duties.

Reginald D Hunter and Aisling Bea join host Jimmy Carr and team captains Sean Lock and Jon Richardson for more comic innuendos, unpredictable conundrums and unforgivable puns in the comedy quiz. Holly Walsh is with Countdown's resident lexicographer Susie Dent in Dictionary Corner, while comedian Joe Wilkinson 'helps' Rachel Riley with her mathematical sums and duties.

Johnny Vegas and Romesh Ranganathan join host Jimmy Carr and team captains Jon Richardson and Sean Lock for more comic innuendos, unpredictable conundrums and unforgivable puns in the comedy quiz. Josie Long is with Countdown's resident lexicographer Susie Dent in Dictionary Corner, while comedian Joe Wilkinson 'helps' Rachel Riley with her mathematical sums and duties.

Vic Reeves and Bob Mortimer join host Jimmy Carr and team captains Sean Lock and Jon Richardson for more comic innuendos, unpredictable conundrums and unforgivable puns in the comedy quiz. Jack Whitehall is with Countdown's resident lexicographer Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' Rachel Riley with her mathematical sums and duties.

Jimmy Carr hosts the comedy panel show's version of the popular quiz, with Sean Lock and Jason Manford going up against guest captain Sarah Millican and Jonathan Ross. Bill Bailey joins Countdown's resident lexicographer Susie Dent in Dictionary Corner, while Rachel Riley looks after the letters and numbers.