When Sir Reginald Styles claims to have seen a ghost, UNIT is called in. The Doctor and Jo spend the night at Styles' house and become the target of an assassin.
| Name | Type | Role | |
|---|---|---|---|
| Louis Marks | Writer | ||
| Gypsie Kemp | Guest Star | ||
| Peter Messaline | Guest Star | ||
| Wilfred Carter | Guest Star | ||
| Deborah Brayshaw | Guest Star | ||
| Oliver Gilbert | Guest Star | ||
| Rick Newby | Guest Star | ||
| Jimmy Winston | Guest Star | ||
| Maurice Bush | Guest Star | ||
| Anna Barry | Guest Star | ||
| Tim Condren | Guest Star | ||
| Aubrey Woods | Guest Star | ||
| Jean McFarlane | Guest Star | ||
| Paul Bernard | Director |