Could we get back to my appeal, please? DOCTOR: And her description? MEGARA: We cannot be called to give evidence. ROMANA: Can you keep it going here? The Megara. Vivien smashed the machine. Which means that Vivien Fay has a different metabolism to Earth-born humans.
Plan: A: The Doctor; Q: Who convinces the Megara to give Vivien Fay a truth test? A: time; Q: What does the Doctor play for? A: Romana; Q: Who is the Doctor trying to get back to Earth to find evidence against Vivien? Summary: The Doctor convinces the Megara to give Vivien Fay a truth test while playing for time so Romana can get back to Earth and find evidence against Vivien.