The TARDIS lands in ancient Greece, and the crew immediately gets involved in the Greek siege of Troy. The Doctor and Steven are captured by the Greeks. Vicki is left in the TARDIS. Of course, the Trojans bring the TARDIS back to Troy and Vicki ends up having to leave before the Trojans burn it. (I doubt that would've worked, but Vicki didn't know that.)
King Priam of Troy renames Vicki "Cressida," and inevitably Vicki and his son Troilus fall for each other. The Doctor gives the Greeks the idea for the Trojan horse, and the Trojans are defeated. The end.
This is Vicki's last episode. I like Vicki a lot, and I think this was a terrible way for her to go. She stays with Troilus. I guess this is one story in which Troilus and Cressida get a happy ending. I'm sorry to see her go at all. I didn't want her to leave so soon after her arrival. Now we're stuck with Steven and Katarina as companions.
This is Katarina's first episode. What's the deal with Katarina? She is always listed as a companion, but she doesn't show up until the end of this story. And she doesn't last long. I wouldn't count her as a companion myself. Katarina is lame. She is too naive and unintelligent to work effectively as a companion on the show. She is Cassandra's handmaiden, and she sort of accidentally goes along with them in the TARDIS at the end. She thinks they're dead. Spoilers- you will be soon, Katarina!
Companions: Vicki, Steven, Katarina
Episode: #20, "The Myth Makers," four parts- 'Temple of Secrets,' 'Small Prophet, Quick Return,' 'Death of a Spy,' 'Horse of Destruction'
Adversary: the Greeks, the Trojans
Classic Lines: Cassandra: "Woe to Troy!" Paris: "It's too late to say 'woah' to the horse."
Tuck This Away to Impress Your Friends: The Doctor first says that Homer made up the wooden "Trojan" horse, but then the Doctor gives the idea of the Trojan horse to the Greeks.
Next Up: "The Daleks' Master Plan"