Jimmy Carr hosts with Sean Lock and Katherine Ryan who take on Jon Richardson and Joe Wilkinson in the classic words and number quiz. Dr John Cooper Clark in Dictionary Corner with Susie Dent and Rachel Riley looks after the numbers.

8 Out of 10 Cats Does Countdown Season 15 Episodes...

• s15e01 - Roisin Conaty, Jessica Hynes, Sara Pascoe, Lolly Adefope
• s15e02 - Sean Lock, Katherine Ryan, Jon Richardson, Joe Wilkinson
• s15e03 - Sean Lock, Miles Jupp, Alan Carr, Roisin Conaty
• s15e04 - Sean Lock, Rob Beckett, Jon Richardson, Claudia Winkleman, Nick Mohammed, Joe Wilkinson
• s15e05 - Phil Wang, Alan Carr, Harriet Kemsley, David O'Doherty, Joe Wilkinson
• s15e06 - Richard Ayoade, Jessica Knappett, Alex Horne
• s15e07 - Kevin Bridges, Joe Wilkinson, Victoria Coren Mitchell, Adam Kay
• s15e08 - Roisin Conaty, Alan Carr, Joe Lycett, Spencer Jones
• s15e09 - Christmas Special with Kathy Burke, David Mitchell, James Acaster, Joe Wilkinson

8 Out of 10 Cats Does Countdown Show Summary

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.