2012 Specials (2012)

As part of a special evening of programming in which a number of Channel 4's most popular programmes crossed into each others' territories, Jimmy Carr hosted an edition of cerebral quiz show Countdown, with Sean Lock and Jon Richardson playing the game. No one realised back then that it'd spawn this long-running show.

2013 Specials (2013)

Jimmy Carr, Jon Richardson and Sean Lock hijacked an episode of Deal or No Deal for the Channel 4 Mash Up 2013, before returning to more games of Countdown.

Series 1 (Channel 4: Series 2) (2013)

The first full series of comically-charged editions of the words and numbers game, for summer 2013, including an 80s special.

Series 2 (Channel 4: Series 3) (2014)

Guests in this series included Rhod Gilbert, Kevin Bridges, Sharon Horgan and James Corden.

Series 3 (Channel 4: Series 4) (2014)

Guests included Jonathan Ross, Bill Bailey, Jo Brand, Jason Manford and Stephen Mangan.

Series 4 (Channel 4: Series 5) (2014)

The boys return for a further 3 episodes during September 2014, and a Christmas special.

Series 5 (Channel 4: Series 6) (2015)

Another run of games for January and February 2015.

Series 6 (Channel 4: Series 7) (2015)

The longest series yet. Joe Wilkinson was missing for this series. Jon Richardson also missed many episodes, so many of the shows feature guest team captains.

Series 7 (Channel 4: Series 8) (2016)

A short run of the series early in 2016.

Series 8 (Channel 4: Series 9) (2016)

The show returned for another series in March 2016.

Series 9 (Channel 4: Series 10) (2016)

Guests in this series include David Mitchell, Richard Ayoade, Katherine Ryan, Roisin Conaty, Victoria Coren-Mitchell, David O'Doherty, Nish Kumar, Henning Wehn, Adam Buxton, Natasia Demetriou, and John Kearns.

Series 10 (Channel 4: Series 11) (2016)

Another run of episodes for late Summer/early Autumn 2016.

Series 11 (Channel 4: Series 12) (2017)

The first series for 2017.

Series 12 (Channel 4: Series 13) (2017)

The teams are back for more games in Spring 2017.

Series 13 (Channel 4: Series 14) (2017)

More words and numbers for the latter half of 2017.

Series 14 (Channel 4: Series 15) (2018)

A new series for 2018.

Series 15 (Channel 4: Series 16) (2018)

Katherine Ryan hosts a special all-female edition of the show to begin this series.

Series 16 (Channel 4: Series 17) (2019)

Series 16 runs from the second week of January.

Series 17 (Channel 4: Series 18) (2019)

Series 18 (Channel 4: Series 19) (2020)

Series 19 (Channel 4: Series 20) (2020)

Christmas Special (2020)

Series 20 (Channel 4: Series 21) (2021)

Christmas Special (2021)

Series 21 (Channel 4: Series 22) (2022)

Series 22 (Channel 4: Series 23) (2022)