| Name | Character | Episodes |
|---|---|---|
| David Mallinson | Goodman | 11 |
| Damian Lewis | Kurt Glemser | 5 |
| Kelly Hunter | Amy Webber | 4 |
| Valentine Pelka | Richard Webber | 2 |
| Jemima Rooper | Siren | 1 |
| Tam Dean Burn | Retro | 1 |
| Simon Chandler | Professor Petersen | 1 |
| Lewis McKenzie | Joshua | 1 |
| Matt Hickey | Skylar | 1 |
| Pauline McLynn | Polly Phemus | 1 |
| Amanda Walker | Hepzibiah McKinley | 1 |