Fearful of a war breaking out between the Silurians and mankind, the Doctor attempts to make peace between the races. But there are those on both sides unwilling to listen.
As the Silurian plague quickly spreads, the Doctor desperately searches for a cure.
England, the 1820s. As the Industrial Revolution gathers pace, the village of Killingworth is disturbed by crazed miners intent on smashing all machinery and engineers. But is there another cause of the situation?
Finding evidence of alien technology in Smythe's office, the Doctor, Jamie and Zoe make their escape in Lady Jennifer's ambulance, but Smythe gives orders to have them killed.
