Back up to: Season 8
6/6 The Doctor has no choice but to turn the parasite against the Master.
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5/6 The Keller Machine is out of control so the Brigadier launches an assault on the prison.
4/6 The parasite within the Keller Machine becomes too powerful for the Master to control.
3/6 The Master plans is to capture a missile and launch it at the World Peace Conference.
2/6 A full scale riot takes place at Stangmoor Prison and Jo is taken hostage.
1/6 At Stangmoor Prison, the Keller Machine can extract evil impulses from criminals.