The TARDIS lands in the London Underground, which is deserted. Jamie and Victoria are captured by the military. The Doctor is amazed to discover that Yetis are in the tunnels.
| Name | Type | Role | |
|---|---|---|---|
| Mervyn Haisman, Henry Lincoln | Writer | ||
| Colin Warman | Guest Star | ||
| Rod Beacham | Guest Star | ||
| Jon Rollason | Guest Star | ||
| Frederick Schrecker | Guest Star | ||
| Stephen Whittaker | Guest Star | ||
| Bernard G. High | Guest Star | ||
| Douglas Camfield | Director |