Jimmy Carr hosts the comedy panel show's version of the words-and-numbers quiz, as Jon Richardson and Michelle Wolf take on guest captain Jonathan Ross with Johnny Vegas. Three-man comedy act Pappy's joins Countdown's resident lexicographer Susie Dent in Dictionary Corner and Rachel Riley looks after the numbers and letters.
| Name | Type | Role | |
|---|---|---|---|
| Johnny Vegas | Guest Star | ||
| Pappy's | Guest Star | ||
| Jonathan Ross | Guest Star | ||
| Michelle Wolf | Guest Star | ||
| Barbara Wiltshire | Director |