The Doctor advertises for a new travelling companion, attracting a group of candidates whose audition quickly becomes a real adventure.
| Name | Type | Role | |
|---|---|---|---|
| Joe Thomas | Guest Star | Theo Lawson | |
| Barnaby Edwards | Guest Star | Rafshaw | |
| Niky Wardley | Guest Star | Juliet Walsh / Tamsin Drew | |
| Sabina Franklyn | Guest Star | Wanda Rothman | |
| James Bachman | Guest Star | Hugh Bainbridge | |
| Tony Millan | Guest Star | Leonard Pallister | |
| Shelley Conn | Guest Star | Asha Qureshi | |
| Joanna Kanska | Guest Star | Rachel |