Taren Capel

Taren Capel was a scientist who tried to instigate a "robot revolution" in the late 29th century.

Capel had spent almost his entire life around robots, being practically raised by them. He identified with them more than people and came to believe that robots should rule humans. He intended to lead a robot revolution, dressing himself and painting his face to resemble his robot "brothers".

He joined the crew of the sandminer Storm Mine 4, where he posed as chief engineer Dask and reprogrammed the robot crew of the sandminer to kill the human crew, at first individually and secretly. Eventually, he ordered them to massacre the survivors, as well as the Fourth Doctor and Leela, who had recently come onboard the Storm Mine 4.

The Doctor drew Capel to a room and had Leela release helium while she was concealed from view. It changed his voice so SV7 did not recognise his commands. SV7 then throttled Capel to death, repeating the command given to him to kill all the humans. (TV: The Robots of Death)