Zoe, Jamie and Isobel confront the Cybermen advancing on them from all sides in the sewers beneath London. The Doctor hurries to devise a protection from the Cybermen's hypnotic signal, as they set their sights on a paralysed London.
| Name | Type | Role | |
|---|---|---|---|
| Derrick Sherwin | Writer | ||
| Terence Denville | Guest Star | ||
| John Spradbury | Guest Star | ||
| Derek Chafer | Guest Star | ||
| Charles Finch | Guest Star | ||
| Douglas Camfield | Director |