Medok
From Tardis Wiki, the free Doctor Who reference
Medok was an inhabitant of a human colony secretly ruled by Macra. He discovered the existence of the Macra, but was believed by the others to be insane. He succeeded in alerting the Second Doctor to the threat. When he was captured, he was sent to the gas mines to work. He was killed by a Macra when he tried to escape. (TV: The Macra Terror)
