With the Doctor about to be ritualistically sacrificed to appease the god Ti for stealing the dodecahedron, Meglos and the pirates return to Zolfa-Thura with the dodecahedron to fire up an ancient weapon and blast Tigella out of existence.
| Name | Type | Role | |
|---|---|---|---|
| John Flanagan, Andrew McCulloch | Writer | ||
| Christopher Owen | Guest Star | ||
| Jacqueline Hill | Guest Star | ||
| Edward Underdown | Guest Star | ||
| Crawford Logan | Guest Star | ||
| Frederick Treves | Guest Star | ||
| Simon Shaw | Guest Star | ||
| Bill Fraser | Guest Star | ||
| Colette Gleeson | Guest Star | ||
| Terence Dudley | Director |