Jimmy Carr hosts a hybrid of the comedy panel show and the words-and-numbers quiz, as Sarah Millican and Tom Allen take on Joe Wilkinson and Rosie Jones. Mathematician Rachel Riley looks after the letters and numbers, while Mr Swallow joins lexicographer Susie Dent in Dictionary Corner.

8 Out of 10 Cats Does Countdown Season 25 Episodes...

• s25e01 - Jon Richardson, Dan Tiernan, Richard Ayoade, Katherine Ryan, John Kearns
• s25e02 - Sarah Millican, Tom Allen, Joe Wilkinson, Rosie Jones, Mr Swallow
• s25e03 - Alan Carr, Munya Chawawa, Sarah Millican, Gary Delaney, Don Rodolfo
• s25e04 - Jon Richardson, Katherine Ryan, Richard Ayoade, Laura Smyth, Mat Ewins
• s25e05 - Richard Ayoade, Kemah Bob, Jonathan Ross, Maisie Adam, Sarah Keyworth

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.