Jimmy Carr, Sean Lock and Jon Richardson take on the famous words and numbers quiz. Jimmy Carr hosts proceedings, and Sean Lock faces Jon Richardson in a rematch of the original encounter. David O'Doherty is in Dictionary Corner along with Countdown regular Susie Dent. Meanwhile the country's favourite boffin Rachel Riley provides the letters and numbers with a little help from comedian Joe Wilkinson.
| Name | Type | Role | |
|---|---|---|---|
| David O'Doherty | Guest Star | ||
| Sean Lock | Guest Star | ||
| Jon Richardson | Guest Star | ||
| Clarke Carlisle | Guest Star | Sean's Team | |
| Susie Dent | Guest Star | ||
| Joe Wilkinson | Guest Star | Jon's Team |