Haydn Jones

A full scale riot takes place at the Prison and Jo is taken hostage. Meanwhile, at the World Peace conference, the Chinese delegate's aid prepares to kill the American delegate.

The mind parasite within the Keller Machine becomes too powerful for the Master to control. It learns how to move of its own accord and goes on the hunt for new minds.

Newly recovered, the Doctor escapes from his cell with Jo. The Master plans to use the Keller Machine to recruit the rioting inmates at Stangmoor Prison and attack the World Peace Conference.