Jimmy Carr hosts the famous words and numbers quiz with regular 8 Out of 10 Cats team captains Sean Lock and Jon Richardson who play against each other. Celebrity guests joining the teams are Rhod Gilbert, Kevin Bridges and Josie Long, alongside Joe Wilkinson, Countdown's resident lexicographer Susie Dent and the country's favourite boffin 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 Kathy Burke and Josh Widdicombe. Countdown regular Susie Dent is assisted in Dictionary Corner by Dara Ó Briain, while Rachel Riley provides the letters and numbers with a little help from Joe Wilkinson

Jimmy Carr hosts this edition along with regular 8 Out of 10 Cats team captains Sean Lock and Jon Richardson who are joined by Dara Ó Briain and Sharon Horgan. Countdown's Susie Dent is in Dictionary Corner with help from Adam Buxton, while Rachel Riley provides the letters and numbers with 'help' from comedian Joe Wilkinson.

Jimmy Carr hosts the show, with captains Sean Lock and Jon Richardson who are joined by James Corden and Jack Dee. Joe Lycett and Joe Wilkinson assist Susie Dent and Rachel Riley.

Jimmy Carr hosts with 8 Out of 10 Cats team captains Sean Lock and Jon Richardson who are joined by Kevin Bridges and James Corden. Peter Serafinowicz is in Dictionary Corner with Countdown's Susie Dent, while Rachel Riley provides the letters and numbers with 'help' from Joe Wilkinson.

Jimmy Carr returns with Sean Lock and Jon Richardson, who are joined by Jonathan Ross and Roisin Conaty. David O'Doherty joins Susie Dent in Dictionary Corner, and Joe Wilkinson 'helps' Rachel Riley.

Guests are Freddie Flintoff and Rhod Gilbert. Henning Wehn joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' Rachel Riley provide the letters and numbers.

Jimmy Carr and team captains Sean Lock and Jon Richardson are joined by Josie Long and Rob Beckett. Vic Reeves joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' 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 Jason Manford and Stephen Mangan. Countdown regular Susie Dent is in Dictionary Corner with Tim Key, while maths expert Rachel Riley provides the letters and numbers with a little `help' from Joe Wilkinson

Jimmy Carr hosts, alongside team captains Sean Lock and Jon Richardson, who are joined by Jo Brand and Claudia Winkleman. Bill Bailey joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' Rachel Riley provide the letters and numbers.

Jimmy Carr hosts, alongside team captains Sean Lock and Jon Richardson, who are joined by Bill Bailey and Josh Widdicombe. Jake Yapp joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'helps' Rachel Riley provide the letters and numbers.

Jimmy Carr hosts the Cats/Countdown mash-up, with Sean Lock, Jon Richardson, Bob Mortimer and Richard Osman. Matthew Crosby joins Susie Dent in Dictionary Corner, and Joe Wilkinson 'helps' Rachel.

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 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 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 Sean Lock and David Mitchell take on Jon Richardson and Katherine Ryan. David O'Doherty joins Susie Dent in Dictionary Corner, while Joe Wilkinson 'assists' Rachel Riley.

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

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, Bill Bailey and Paul Foot who take on Sarah Millican, Rob Delaney and Romesh Ranganathan. Nina Conti joins Susie Dent in Dictionary Corner, with Rachel Riley.

Jimmy Carr hosts with Sean Lock and Kevin Bridges who take on Jon Richardson and Kathy Burke. Joe Lycett joins Susie Dent, while Nick Helm 'assists' Rachel Riley.

Jimmy Carr hosts as Sean Lock and Rhod Gilbert go up against Jon Richardson and Sara Pascoe; Johnny Vegas is in Dictionary Corner while Joey Essex 'assists' Rachel Riley

Jimmy Carr hosts, while Jon Richardson and Katherine Ryan take on Sean Lock and Rob Beckett, Greg Davies is in Dictionary Corner