Arriving in the city of Millennius, Ian is put on trial for murder. The Doctor takes on the role of defence counsel and must prove Ian's innocence or he will be executed.
| Name | Type | Role | |
|---|---|---|---|
| Terry Nation | Writer | ||
| Alan James | Guest Star | ||
| Fiona Walker | Guest Star | ||
| Donald Pickering | Guest Star | ||
| Raf de la Torre | Guest Star | ||
| Michael Allaby | Guest Star | ||
| Katherine Schofield | Guest Star | ||
| Henley Thomas | Guest Star | ||
| Robin Phillips | Guest Star | ||
| Peter Stenson | Guest Star | ||
| Martin Cort | Guest Star | ||
| John Gorrie | Director |