Story Order
- Story 56 from Doctor Who
- Story 2 of 5 from Season 8
The Doctor and Jo watch a demonstration of the Keller Machine which can extract evil impulses from criminals.
A full scale riot takes place at the Prison and Jo is taken hostage.
The Master is behind the Keller Machine and uses it to recruit the rioting inmates at Stangmoor Prison.
The mind parasite within the Keller Machine becomes too powerful for the Master to control.
The Master forms an uneasy alliance with the Doctor so that between them they can subdue the Keller Machine.
The Keller Machine breaks free of the Doctor's restraining device. The Doctor turns it against the Master.
Third DoctorJon Pertwee
Alistair Gordon Lethbridge-StewartNicholas Courtney
Jo GrantKaty Manning
Mike YatesRichard Franklin
BarnhamNeil McCarthy
John BentonJohn Levene
MailerWilliam Marlowe
VosperHaydn Jones
Fu PengKristopher Kum
Senator AlcottTommy Duggan
FullerJohnny Barrs
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