Jimmy Carr hosts as Richard Ayoade and Kemah Bob take on Jonathan Ross and Maisie Adam in the classic words and numbers quiz. Sarah Keyworth joins Susie Dent in Dictionary Corner, while Dr Anne-Marie Imafidon fills in for Rachel Riley looking after the letters and numbers.

Katherine Ryan hosts a special, celebrating 100 years of women's suffrage. Roisin Conaty and Jessica Hynes go against Sara Pascoe and Lolly Adefope. Also featuring Morgana Robinson, Susie and Rachel.

Jimmy Carr hosts as Jon Richardson and Rosie Jones take on Joe Wilkinson and Phil Wang. Dr John Cooper Clarke joins Susie Dent in Dictionary Corner. With Rachel Riley.

Jimmy Carr hosts as Sean Lock and Stephen Mangan take on guest captains Richard Ayoade and Katherine Ryan. Bill Bailey is in Dictionary Corner

Jimmy Carr hosts as Roisin Conaty and Kiri Pritchard-McLean take on Jon Richardson and Rob Beckett. Comedian Huge Davies 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 Jack Dee and Tom Allen take on Jon Richardson and Judi Love. Dr John Cooper Clarke is in Dictionary Corner.

Jimmy Carr hosts the words and numbers game show mash-up, with `Countdown' regulars Rachel Riley and Susie Dent. Jonathan Ross and Russell Kane take on Alan Carr and Judi Love. Josh Jones is in Dictionary Corner.

Jimmy Carr hosts as Sean Lock and David Mitchell go up against Jon Richardson and Katherine Ryan. Brett Domino Trio joins Susie Dent in Dictionary Corner.

Jimmy Carr hosts as Jon Richardson and Tom Allen take on Sean Lock and Rosie Jones. With guest Adam Riches as Sean Bean, plus experts Susie Dent and Rachel Riley.

Jimmy Carr hosts with Rachel Riley and Susie Dent. Sean Lock and Paul Foot take on Jon Richardson and Angela Barnes. John Cooper Clarke joins Dictionary Corner.

Jimmy Carr presides over the hit comedy panel show where Sean Lock and Katherine Ryan take on Jon Richardson and David Mitchell. Nick Helm is in Dictionary Corner.

Jimmy Carr hosts, and it's Jon Richardson and Chris Addison against Joe Wilkinson and Katherine Ryan, with David O'Doherty in Dictionary Corner.

Katherine Ryan and Joe Lycett take on Sean Lock and Johnny Vegas. Jimmy Carr hosts. Rachel Riley looks after the numbers. Christopher Bliss joins Susie Dent in Dictionary Corner.

Jimmy Carr hosts as Sarah Millican and Phil Wang take on Tom Allen and Roisin Conaty. Sam Campbell joins Susie Dent in Dictionary Corner. With Rachel Riley.

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 Sean Lock and David O'Doherty go up against Jon Richardson and Natasia Demetriou. John Kearns joins Susie Dent in Dictionary Corner, with Rachel Riley.

Jimmy Carr hosts with guest captain Claudia Winkleman and Johnny Vegas versus Jon Richardson and Reginald D Hunter. Sara Pascoe joins Susie Dent in Dictionary Corner.

Jimmy Carr hosts the words and numbers quiz that this week pits Sean Locke and Johnny Vegas against guest captain Alan Carr and Lou Sanders. The Brett Domino Trio join Susie Dent in Dictionary Corner.

Sean Lock and Sara Pascoe take on Alan Carr and Tom Allen, while Rosie Jones is in Dictionary Corner.

Sean Lock and Harriet Kemsley take on special guest team captain Alan Carr and Catherine Tate, while Adam Buxton joins Susie Dent in Dictionary Corner

Jimmy Carr hosts as Sean Lock and Kevin Bridges take on Jon Richardson and Victoria Coren Mitchell in the classic words and numbers quiz. Spencer Jones joins Susie Dent in Dictionary Corner, and Rachel Riley looks after the numbers and letters.

Jimmy Carr hosts the words and numbers game show mash-up, with Countdown regulars Rachel Riley and Susie Dent. Jon Richardson and Jo Brand take on Joe Wilkinson and Jamali Maddix. Rachel Parris is in Dictionary Corner.

Jimmy Carr hosts the raucous game show mash-up, as Sarah Millican and Tom Allen take on Joe Wilkinson and Rosie Jones. Mr Swallow (Nick Mohammed) joins Susie Dent in Dictionary Corner, while maths whizz Rachel Riley looks after the numbers.

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. Jon Richardson and Alex Brooker take on Johnny Vegas and Sara Pascoe. Tom Allen's in Dictionary Corner. Claudia Winkleman and Rob Beckett stand in for Rachel Riley.