England, the near future. The Krynoid grows to monstrous size and traps the Doctor and the others in a cottage. The creature demands they turn over the Doctor, while Chase seeks to make an alliance with the alien vegetation.
| Name | Type | Role | |
|---|---|---|---|
| Robert Banks Stewart | Writer | ||
| Sylvia Coleridge | Guest Star | ||
| John Acheson | Guest Star | ||
| Ray Barron | Guest Star | ||
| Douglas Camfield | Director |