Jimmy Carr hosts a combination of the comedy panel show and the long-running words-and-numbers quiz, with Jon Richardson and Big Zuu taking on Danny Dyer and Helen Bauer. Mathematician Rachel Riley looks after the letters and numbers, while Mat Ewins joins lexicographer Susie Dent in Dictionary Corner.

Jimmy Carr and Jon Richardson are joined by a host of top comedians for a compilation of best bits from Cats Does Countdown, including Lee Mack, Sarah Millican, Alan Carr, Richard Ayoade, Katherine Ryan, Tom Allen, Judi Love, Nick Mohammed, Jonathan Ross, Rose Matafeo and Sam Campbell, along with regulars Joe Wilkinson, Susie Dent and Rachel Riley.