Katherine Ryan, David Mitchell, Nick Helm

Vic Reeves 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. David O'Doherty is with Countdown's resident lexicographer Susie Dent in Dictionary Corner, while Rachel Riley looks after the numbers and letters