8 Out of 10 Cats Does CountdownSeries 21Season 21 · 2021 · 6 episodesEpisodes1Katherine Ryan, Joe Lycett, Johnny Vegas, Christopher BlissKatherine 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.2Paul Foot, Angela Barnes, John Cooper ClarkeJimmy 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.3Harriet Kemsley, Joe Lycett, Mat EwinsJimmy Carr and Rachel Riley host as Sean Lock and Harriet Kemsley compete against Jon Richardson and Joe Lycett. Mat Ewins joins Susie Dent in Dictionary Corner.4Sara Pascoe, Richard Ayoade, Nick HelmJimmy Carr hosts the game show mash-up, with Rachel Riley and Susie Dent. Jon Richardson and Sara Pascoe take on Sean Lock and Richard Ayoade. Nick Helm joins Susie in Dictionary Corner.5Lucy Beaumont, Roisin Conaty, Joe Wilkinson, Bec HillJimmy Carr hosts as Jon Richardson and Lucy Beaumont take on Roisin Conaty and Joe Wilkinson. Bec Hill joins Susie Dent in Dictionary Corner.6Joe Wilkinson, Lee Mack, Katherine Ryan, Brett DominoJon Richardson and Joe Wilkinson take on Lee Mack and Katherine Ryan. Brett Domino is in Dictionary Corner. Jimmy Carr hosts, with Rachel Riley and Susie Dent.Season 1Season 2Season 3Season 4Season 5Season 6Season 7Season 8Season 9Season 10Season 11Season 12Season 13Season 14Season 15Season 16Season 17Season 18Season 19Season 20Season 22Season 23Season 24Season 25Season 26Season 27Season 28Season 29Season 30