The Doctor and Jo are taken to Earth, where both humans and Draconians believe them to be a spy for the other side.
Quest roles:
Peter Birrel(Draconian Prince), Ray Lonnen(Gardiner), James Culliford(Stewart), Karol Hagar(Secretary), John Rees(Hardy), Barry Ashton(Kemp), Vera Fusek(President of Earth), Michael Hawkins(General Williams)