In 19th century England, the Doctor finds himself facing two competing enemies: his old adversary, the Master, and the Rani, another Time Lord with a sinister plan. The local population is turning violent and unpredictable. With a major meeting of the brains of the Industrial Revolution due to happen in the village soon, the Doctor must work out what exactly is causing all the problems. Only the Doctor can stop the Master and the Rani's evil plans.