Jimmy Carr hosts the words and numbers quiz with Jon Richardson and David Mitchell who take on guest captain Joe Wilkinson and Roisin Conaty. Tom Allen is in Dictionary Corner.

Guest captain Lee Mack and Catherine Tate vs Sean Lock and Miles Jupp. John Cooper Clarke joins Susie Dent in Dictionary Corner, and Rachel Riley looks after the letters and numbers.

Jimmy Carr hosts the words and numbers game show mash-up, with `Countdown' regulars Rachel Riley and Susie Dent. Roisin Conaty and Joe Wilkinson play against Jon Richardson and Nabil Abdulrashid. David O'Doherty is in Dictionary Corner.

Jimmy Carr hosts the comedy panel show's version of the famous quiz, with team captains Sean Lock and Jon Richardson joined by guests Vic Reeves and Jo Brand. Countdown regular Susie Dent is in Dictionary Corner with Adam Buxton, maths expert Rachel Riley looks after the letters and numbers, and there's a special appearance by Rob Beckett.

Jimmy Carr hosts as Jon Richardson and Jack Whitehall take on Sean Lock and Roisin Conaty. Rob Beckett joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' Rachel Riley.

Jimmy Carr plays host as Jon Richardson and Bob Mortimer take on Sean Lock and Vic Reeves, while Jack Whitehall joins Susie Dent in Dictionary Corner,

The comic mash-up, hosted by Jimmy Carr. Jon Richardson and Joe Lycett take on Sean Lock and Michelle Wolf, while Adam Riches is in Dictionary Corner.

Jimmy Carr hosts as Sean Lock and Daisy May Cooper take on Richard Ayoade and Ivo Graham. Adam Buxton joins Susie Dent in Dictionary Corner and Joe Wilkinson assists Rachel Riley.

Jimmy Carr hosts the comedy panel show's version of the famous quiz, with team captains Sean Lock and Jon Richardson joined by guests David Baddiel and Trevor Noah. Countdown regular Susie Dent is in Dictionary Corner with Joey Essex, while maths expert Rachel Riley provides the letters and numbers with help from Alex Horne and the Horne Section.

Jimmy Carr hosts with guest captain Richard Ayoade and Rob Beckett vs Jon Richardson and Claudia Winkleman. Adam Riches joins Dictionary Corner, with Susie Dent and Rachel Riley.

Jimmy Carr hosts the words and numbers quiz with Jon Richardson and Phil Wang vs guest captain Russell Howard and Roisin Conaty. Nick Helm is in Dictionary Corner.

Sean Lock and Katherine Ryan take on Jon Richardson and Joe Wilkinson. Adam Riches as Sean Bean is in Dictionary Corner.

Jimmy Carr hosts, as Roisin Conaty and Asim Chaudhry take on Jon Richardson and Josh Widdicombe. Bill Bailey is in Dictionary Corner. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate

Jimmy Carr hosts with `Countdown' regulars Rachel Riley and Susie Dent as Sean Lock and Harry Hill take on Jon Richardson and Rosie Jones. Mr Swallow, aka Nick Mohammed, is in Dictionary Corner.

Jimmy Carr hosts with Rachel Riley and Susie Dent. Jon Richardson and Lucy Beaumont take on Richard Ayoade and Joe Wilkinson and Finlay Christie finds himself in Dictionary Corner.

Jimmy Carr hosts the first of three new comedy editions of the famous quiz. Team captains Sean Lock and Jon Richardson are joined by Peep Show star David Mitchell and stand-up comedienne Roisin Conaty. Phill Jupitus is in Dictionary Corner with Susie Dent, while Joe Wilkinson `helps' Rachel Riley with the letters and numbers.

Jimmy Carr hosts as Jon Richardson and Aisling Bea take on Sean Lock and Reginald D. Hunter. Holly Walsh is in Dictionary Corner with Susie Dent, while Joe Wilkinson attempts to 'help' Rachel Riley.

Jimmy Carr hosts as Jon Richardson and Johnny Vegas take on Sean Lock and Romesh Ranganathan. Josie Long joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' Rachel Riley.

Jimmy Carr hosts with Sean Lock and Jason Manford going up against guest captain Sarah Millican, and Jonathan Ross. Bill Bailey joins Susie Dent in Dictionary Corner.

Jimmy Carr hosts with Sean Lock and Danny Dyer vs Joe Wilkinson and Gabby Logan. David O'Doherty joins Dictionary Corner, with Susie Dent and Rachel Riley.

Jimmy Carr hosts, and it's Jon Richardson and Jonathan Ross against Lee Mack and Victoria Coren Mitchell, with Jessie Cave in Dictionary Corner.

Sean Lock and Joe Wilkinson take on Jon Richardson and Sara Pascoe. Sam Simmons is in Dictionary Corner, while maths whizz Rachel Riley looks after the letters and numbers.

Jimmy Carr hosts the words and numbers game show mash-up, with Countdown regulars Rachel Riley and Susie Dent. Richard Ayoade and Sara Pascoe take on Jon Richardson and Chris McCausland. Morgana Robinson is in Dictionary Corner.

Guest captain David Walliams and Jessica Hynes take on Jon Richardson and Rhod Gilbert. Sam Simmons is in Dictionary Corner, with Susie Dent and Rachel Riley.

Jimmy Carr hosts, David Mitchell and Cariad Lloyd take on Jon Richardson and Russell Howard. Sam Simmons joins Susie Dent in Dictionary Corner, while Rachel Riley flips the tiles.