The Network (Echoes of Extinction)

 was. . . ''A being of pure psychic energy created by the government of a nation state on the planet of Orriv. It was originally designed to spy on other states, but it gained awareness. Due to this a scientist working on it, Jasmine, attempted to free it but during the escape it was forced to hide in her mind. In order to work out where the energy creature was Jasmines government framed her for a terrorist attack and imprisoned her on a floating satellite. They set a live feed to the prison from the planet which allowed anyone to directly accuse jasmine of murder. The hope was jasmine would crack and give up the network’s location. However unknowingly as The network was still present in Jasmine’s mind it heard everyone calling her a killer. Over time it was overloaded with so many accusations it came to believe itself to be a killer. When Jasmine attempted to contact the planet, the network used this connection to travel to Orriv and slaughter everyone living there. He then travelled back to he ship with Jasmine. Unfortunately it still heard the voices of people accusing it of being a killer so was still compelled to kill anyone it met, except Jasmine

The eighth doctor later travelled to the station and during a psychic connection was able to work out the origin of the network and its motives. Jasmine and the doctor defeated the network by forcing it to be transported to the planet. The network avoided this by creating a duplicate of itself in the ship but committed suicide in an attempt to spread its mind across the universe. Meanwhile it’s copy on the planet met with the tenth doctor who was able to persuade it to stop killing. If he had failed then it would’ve have tried to take over victims bodies and use them to travel to planet to planet in a vain attempt to remove the voices in its head by killing everyone it met ''