The Doctor barricades everyone in the lighthouse to protect them from the mysterious deadly creature in the fog. But it may already be inside, biding its time…
| Name | Type | Role | |
|---|---|---|---|
| Terrance Dicks | Writer | ||
| Rio Fanning | Guest Star | ||
| John Abbott | Guest Star | ||
| Sean Caffrey | Guest Star | ||
| Annette Woollett | Guest Star | ||
| Paddy Russell | Director |