Jimmy Carr hosts as Roisin Conaty and Kiri Pritchard-McLean take on Jon Richardson and Rob Beckett. Comedian Huge Davies is in Dictionary Corner. Regular Countdown mathematician Rachel Riley and lexicographer Susie Dent are on hand to adjudicate.
| Name | Type | Role | |
|---|---|---|---|
| Kiri Pritchard-McLean | Guest Star | ||
| Rob Beckett | Guest Star | ||
| Huge Davies | Guest Star | ||
| Roisin Conaty | Guest Star |