(She points at the Keller machine.) (To BARNHAM.) DOCTOR: The Master? STANGMOOR PRISON. The BRIGADIER has entered the gallery unseen from a side door and taken care of the DOCTOR and JO'S captor.
Plan: A: Stangmoor; Q: What has the Brigadier recaptured? A: control; Q: What does the Master still have over the Thunderbolt? A: the Doctor; Q: Who must find a way to stop the Master? A: the Keller Machine; Q: What must the Doctor destroy to stop the Master? Summary: The Brigadier has recaptured Stangmoor but the Master still has control of the Thunderbolt and the Doctor must find a way to stop him and destroy the Keller Machine.