The Doctor, Jamie and Victoria find themselves on the east coast of England where a gas refinery is experiencing problems and a sinister heartbeat is throbbing through the pipes.
| Name | Type | Role | |
|---|---|---|---|
| Victor Pemberton | Writer | ||
| Peter Ducrow | Guest Star | ||
| Richard Mayes | Guest Star | ||
| John Garvin | Guest Star | ||
| Hugh David | Director |