BRIGADIER: But Billy. Controlled? JAMIE: Well, he is. The Cybermen. UNIT AEROPLANE
(The DOCTOR studies yet another map, this one of the sewers of London, which he describes to his audience of the BRIGADIER, JAMIE, ZOE, TURNER and ISOBEL.) What about the Brigadier? ZOE: So Vaughn's helping them.
Plan: A: the Cybermen; Q: What do the Doctor and Jamie tell the Brigadier about? A: Rutledge; Q: Who is under Vaughn's control? Summary: The Doctor and Jamie tell the Brigadier about the Cybermen but with Rutledge under Vaughn's control he is powerless to act.