Doctor Who episode 698: The Curse of Fenric – Part Four (15/11/1989)
‘They’re trying to control the world with chemical weapons. Let’s join forces. Fight the real enemy.’ “So, the secret of defeating Fenric is an illegal chess move and a quick chat with the Ancient One. Simples. Now that’s all sorted let’s dry clean our clothes and go for a swim and try not to worry about your grandma turning up on the doorstep of a complete stranger in Streatham.” I bet Kathleen nursed a grudge against that Ace for years for sending her on a wild goose chase.