England: The 20th Century. After they return from England after their Antarctic ordeal, Chase tries to eliminate the Doctor and Sarah Jane, but they escape and track him down at his estate, where he is preparing to open the Krynoid pod.
| Name | Type | Role | |
|---|---|---|---|
| Robert Banks Stewart | Writer | ||
| Sylvia Coleridge | Guest Star | ||
| David Masterman | Guest Star | ||
| Alan Chuntz | Guest Star | ||
| Kenneth Gilbert | Guest Star | ||
| Douglas Camfield | Director |