Eric Leeson was a colonist in the human settlement on the planet Uxarieus in 2472 and the brother of Alec Leeson.
Eric was the husband of Jane Leeson, and mildly supported those colonists who wished to abandon the colony. He distrusted the Third Doctor, who he suspected of being a mineralogist. He was killed by IMC's robot, along with his wife. (TV: Colony in Space)