Jimmy Carr hosts, as Lee Mack and Joe Wilkinson take on Jon Richardson and Jessica Knappett. Comedian Nigel Ng is in Dictionary Corner. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate.
| Name | Type | Role | |
|---|---|---|---|
| Joe Wilkinson | Guest Star | ||
| Jessica Knappett | Guest Star | ||
| Nigel Ng | Guest Star | ||
| Lee Mack | Guest Star |