The one where the Master reveals who he's been working for all along...
As predicted, Jo's fear centres throw up an image of a terrifying Drashig from Carnival of Monsters, as well as a rather benign Mutt from The Mutants and a somewhat sinister Sea Devil from, er... The Sea Devils. What, no Gell Guards, Jo? Still, it's lovely to have a menagerie of monsters!
Back on Earth, the people are restless and calling for war to be waged on Draconia. We see this communicated via telecast by a particularly irate Congressman Brook, leader of the Opposition, who was mentioned by the futuristic Trevor McDonald back in episode 1. The President of Earth and her pastel chiffon dresses are in trouble, and there's only one man who can forge peace before it's too late - Doctor Who (dressed as Miss Marple).