Jimmy Carr returns with a brand-new series of the chaotic comedy twist on Channel 4's classic words and numbers quiz. In this episode, Richard Ayoade and Harriet Dyer take on Bob Mortimer and Tom Allen. Ian Smith's in Dictionary Corner with legendary lexicographer Susie Dent, while maths machine Rachel Riley looks after the numbers. And Joe Wilkinson - quite literally - drops in. Because of course he does.

Jimmy Carr hosts the chaotic comedy twist on Channel 4's classic brainteaser quiz. In this episode, Joe Wilkinson and Josh Widdicombe take on Rhod Gilbert and Thaniya Moore. Frankie Monroe (Joe Kent-Walters) joins Susie Dent in Dictionary Corner, while maths whizz Rachel Riley looks after the numbers.

Jimmy Carr hosts another helping of chaos, comedy and Countdown. Joe Wilkinson and Alex Brooker take on Kevin Bridges and Judi Love. Brian Butterfield (Peter Serafinowicz) joins Susie Dent in Dictionary Corner, while maths whizz Rachel Riley looks after the numbers.

Jimmy Carr hosts with Countdown regulars Rachel Riley and Susie Dent. Roisin Conaty and Phil Wang play against Joe Wilkinson and Lou Sanders, with David O'Doherty joining Susie in Dictionary Corner.

Jimmy Carr hosts, inviting Jon Richardson and Lucy Beaumont to compete against Rob Brydon and Joe Wilkinson. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate, while Huge Davies joins Susie in Dictionary Corner