Danny Dyer is set to join dictionary corner in the latest episode of 8 Out Of 10 Cats Does Countdown.
The Football Factory actor will join Countdown's Susie Dent on the word checking desk in the first episode of the new comedy series, said Digital Spy.
Channel 4 first ran the mash-up show as a one-off special in 2012 but have now commissioned a six-episode series.
Jimmy Carr is hosting as usual, with Countdown mathematician Rachel Riley on the numbers and captains Sean Lock and Jon Richardson running their celebrity teams.
So far comedians lined up for the teams over the series include Sarah Millican, Jason Manford, Jack Dee and Rhod Gilbert.
The priogramme fuses the opinion poll-based comedy panel show with the channel's classic words and numbers timed contest.
Entertainment commissioning editor Madeleine Knight said: "Originally commissioned as part of the Channel 4 Mash Up night, 8 Out Of 10 Cats Does Countdown has proved it deserves a run of its own. This combination of two of Channel 4's favourite shows brings together the best of both. It's a treat."