The mystery surrounding the strange skull deepens. Thea is slowly succumbing to its influence while the Doctor prepares to battle a creature from mythology.
| Name | Type | Role | |
|---|---|---|---|
| Chris Boucher | Writer | ||
| Daphne Heard | Guest Star | ||
| Edward Evans | Guest Star | ||
| Edward Arthur | Guest Star | ||
| Derek Martin | Guest Star | ||
| George Spenton-Foster | Director |