The Doctor works to free his planet of the Vardan menace. How can he defeat an enemy who can read his very thoughts? And does their invasion conceal a greater menace?
| Name | Type | Role | |
|---|---|---|---|
| Anthony Read | Writer | ||
| Graham Williams | Writer | ||
| Stan McGowan | Guest Star | Vardan | |
| Michael Mundell | Guest Star | ||
| Gai Smith | Guest Star | ||
| Eric Danot | Guest Star | ||
| Hilary Ryan | Guest Star | ||
| Derek Deadman | Guest Star | ||
| Ray Callaghan | Guest Star | ||
| Gerald Blake | Director |