The Doctor meets Colonel Lethbridge-Stewart who takes control of the military operation against the Yeti. But the Doctor suspects that there is a traitor in their midst.
Name | Type | Role | |
---|---|---|---|
Mervyn Haisman, Henry Lincoln | Writer | ||
Jon Rollason | Guest Star | ||
Jeremy King | Guest Star | ||
Stephen Whittaker | Guest Star | ||
Rod Beacham | Guest Star | ||
Douglas Camfield | Director |