Corpse Marker by Chris Boucher

A long time ago, the Doctor and his companion faced the Robots of death, however to a society totally dependant on Robots, news that this could happen, that robots could turn violent would cause mass panic and hysteria. For this reason it was all kept a secret.

There are only three survivors who bear witness to the Sandminer massacre, but now several years later they are showing signs of mental breakdown. To make matters worse, the Robots are once again being programmed to kill, worst of all, this time the deadly robots are not confined to a Sandminer.

This time they are loose in the City of Kaldor. And this time, unless the Doctor and Leela can stop them, they really will destroy the entire world.