| Name | Character | Episodes |
|---|---|---|
| Kevin Eldon | Matt | 2 |
| Tom Ellis | Alex | 1 |
| David Tennant | Dr. Krull | 1 |
| Nick Frost | 1 | |
| Marc Warren | 1 | |
| Roger Frost | Gordon | 1 |
| Mackenzie Crook | Grishnack | 1 |
| Rafe Spall | 1 | |
| Keith Allen | 1 | |
| Helen Coker | 1 | |
| Mark Heap | Balfus | 1 |
| Jonathan Firth | Marcus | 1 |
| Kate Fleetwood | 1 | |
| Zoe Telford | 1 | |
| Robbie Gee | 1 | |
| Samantha Power | 1 | |
| Darren Boyd | Alan | 1 |
| Rupert Vansittart | 1 | |
| Raquel Cassidy | 1 | |
| Catherine Tate | 1 | |
| Mark Benton | 1 | |
| Emma Pierson | Emma | 1 |
| Simon Woods | 1 | |
| Lesley Vickerage | Jeannie | 1 |
| Alexei Sayle | Graham | 1 |
| Robert Webb | 1 | |
| Adrian Edmondson | 1 | |
| Tim Plester | Tim | 1 |
| Antony Cotton | 1 | |
| Nitin Ganatra | 1 | |
| David Mitchell | 1 | |
| Joanna Bobin | 1 | |
| Phil Cornwell | 1 | |
| Craig Kelly | Jack | 1 |
| Marcus Brigstocke | 1 | |
| John Fortune | Frank | 1 |
| Paola Dionisotti | 1 | |
| Mary Tamm | 1 | |
| Shane Connor | 1 | |
| Paul Darrow | 1 | |
| Bruce Mackinnon | Darren | 1 |
| Ashley Artus | 1 | |
| Matthew Delamere | 1 | |
| Sandra Huggett | 1 | |
| Nicholas Pinnock | Jon | 1 |