Medok

Medok was an inhabitant of a human colony secretly ruled by Macra.

Biography
Medok discovered the existence of the Macra but was believed by the other colonists to be insane. When attempting to convince the Pilot, he caused some confusion by insinuating that the Macra were insects, and his claims were dismissed. (PROSE: Medok) However, he succeeded in alerting the Second Doctor to the threat.

When Medok was captured, he was sent to the gas mines to work. He was knocked unconscious (PROSE: The Macra Terror) by a Macra when he tried to escape. (TV: The Macra Terror) After he awoke, he fled out of the mine shaft to discover that the Macra had been defeated, and watched the Doctor, Ben Jackson, Polly Wright, and Jamie McCrimmon depart in the TARDIS, but opted not to tell his friends out of resentment that they had not initially believed him about the Macra, even while other residents of the Colony wondered what had happened to the travellers. (PROSE: The Macra Terror)