Jimmy Carr hosts the comedy panel show's version of the words and numbers quiz, with Vic Reeves and Sara Pascoe joining team captains Sean Lock and Lee Mack. Alex Horne and the Horne Section join Countdown regular Susie Dent in Dictionary Corner, while Rachel Riley provides the numbers and letters
s08e01 - Bill Bailey, Sarah Millican, Rob Delaney, Nina Conti
s08e02 - Kevin Bridges, Kathy Burke, Joe Lycett
s08e03 - Rhod Gilbert, Sara Pascoe, Johnny Vegas
s08e04 - Rob Beckett, Katherine Ryan, Greg Davies
s08e05 - Miles Jupp, Greg Davies, Holly Walsh
s08e06 - Vic Reeves, Lee Mack, Sara Pascoe, Alex Horne
s08e07 - Bob Mortimer, Sarah Millican, Katherine Ryan, Alex Horne
s08e08 - Roisin Conaty, Sarah Millican, Rhod Gilbert, David O'Doherty
s08e09 - Seann Walsh, Joe Wilkinson, Danny Dyer, Bill Bailey
s08e10 - Johnny Vegas, Sarah Millican, Rob Beckett, Vic Reeves
s08e11 - Mel Giedroyc, Lee Mack, David O'Doherty, Adam Buxton
s08e12 - Andrew Flintoff, Bill Bailey, Roisin Conaty, Rob Beckett
s08e13 - Liza Tarbuck, Sarah Millican, Romesh Ranganathan, Phill Jupitus
s08e14 - Bill Bailey, Joe Wilkinson, Isy Suttie, Joe Lycett
s08e15 - Henning Wehn, Bill Bailey, Jessica Hynes, Tom Allen
s08e16 - Sara Pascoe, Josh Widdicombe, Alex Horne
s08e17 - Greg Davies, Holly Walsh, Vic Reeves
In 2012, two of Channel 4's most popular quizzes - the topical hit 8 Out Of 10 Cats and the cerebral words-and-numbers game Countdown - came to metaphorical blows as the anarchic comedians of the former took on the brainbox format of the latter.
Jimmy Carr was the host, with Sean Lock and Jon Richardson as the contestants. Jimmy was helped by Countdown regulars Susie Dent and Rachel Riley, and hindered by Joe Wilkinson.
The gang returned to play Countdown a second time later in 2012.
In January 2013, as part of the next Channel 4 Mash Up, Jimmy Carr, Jon Richardson and Sean Lock hijacked an episode of Deal or No Deal. A number of comedians joined in, plus Rachel Riley and Susie Dent again. Joe Wilkinson acted as the Banker's assistant.
Since 2013, the show has run regularly with multiple-episode series.