Commander (The Sensorites)

The Commander was the leader of an exploration mission from the Earth Empire. He made contact with the Sensorites, discovered that the Sense Sphere was rich in molybdenum and attempted to exploit its mineral wealth. Shortly afterwards he and his crew appeared to die when their spacecraft exploded. In fact they had faked their deaths and hid in the caves outside the Sensorites' city. They began adding atropine to their water supply in the hopes of killing them all and claiming the planet for themselves. Their scheme was discovered by the Doctor and they were taken into custody by Maitland's crew. (DW: The Sensorites)