The Sontarans finally invade the TARDIS itself, seeking the Great Key. The Doctor, however, has other uses for this powerful object…
Quest roles:
Milton Johns(Kelner), Max Faulkner(Thal Guard), Stuart Fell(Roga), Chris Tranchell(Andred), John Arnatt(Borusa), Hilary Ryan(Rodan), Derek Deadman(Stor), Gai Waterhouse(Presta)