Director Colin Teague and producer Richard Stokes go behind the scenes on location to explain how one of the series' biggest special effects was created. Plus, actresses Eve Myles and Nikki Amuka-Bird discuss the relationship between their characters Gwen and Beth.
| Name | Type | Role | |
|---|---|---|---|
| Danny Hargreaves | Guest Star | ||
| Nikki Amuka-Bird | Guest Star | ||
| James Moran | Guest Star | ||
| Nikki Amuka-Bird | Guest Star | ||
| Colin Teague | Guest Star |