(To VAUGHN.) OUTSIDE
(The DOCTOR and JAMIE follow the guards that have ZOE and ISOBEL in their boxes, and they hide when PACKER appears.) Probably the helicopter's trying to pick them up. RUTLIDGE: What? VAUGHN: Is it? We've got to find out, and quickly.
Plan: A: UNIT; Q: Who do The Doctor and Jamie enlist to help them rescue Zoe and Isobel? A: Vaughn; Q: Who is the Doctor trying to find out what he is up to? Summary: The Doctor and Jamie enlist the help of UNIT to rescue Zoe and Isobel before trying to find out what Vaughn is really up to.