England, the near future. The Doctor, Sarah Jane, and Scorby are trapped in the manor as a possessed Chase stalks them from within, while the gigantic Krynoid prepares to crush them from without. Worse, the alien plant is ready to germinate, spreading its seeds across England.
| Name | Type | Role | |
|---|---|---|---|
| Robert Banks Stewart | Writer | ||
| Ray Barron | Guest Star | ||
| John Acheson | Guest Star | ||
| Douglas Camfield | Director |