Sensorite

Sensorites were a telepathic humanoid race native to the Sense Sphere. They possessed bulbous heads with large black eyes and were extremely sensitive to light and noise. They were normally a peaceful, non-agressive people.

In the 28th century, an exploration mission from the Earth Empire made contact with the Sensorites and attempted to exploit their world's mineral wealth. The humans appeared to die when their spacecraft exploded and the Sensorites began to suffer a plague shortly afterwards.

Years later, when a second exploration mission from Earth arrived, the Sensorites feared they would also attempt to exploit them and held them prisoner aboard their ship. The situation was resolved by the Doctor and his companions, who made peace between the Sensorites and the Humans, and revealed that the plague was actually atropine poisoning caused by the insane survivors of the first expedition. (DW: The Sensorites)