The deadly web continues to advance in the tunnels of the Underground. Professor Travers realises that the Doctor is the only man who can help bring an end to the Yeti menace.
| Name | Type | Role | |
|---|---|---|---|
| Mervyn Haisman, Henry Lincoln | Writer | ||
| Joseph O'Connell | Guest Star | ||
| Colin Warman | Guest Star | ||
| Jeremy King | Guest Star | ||
| Rod Beacham | Guest Star | ||
| Jon Rollason | Guest Star | ||
| Stephen Whittaker | Guest Star | ||
| Douglas Camfield | Director |