Eutermesan

Eutermesans were a humanoid species native to Zone Eutermes, an annex of a universe that existed outside our own. One Eutermesan, C'rizz, became the Doctor's companion after meeting him while on the run from the Kromon. (BFA: The Creed of the Kromon)

Biology
The Eutermesans were a race of reptilian humanoids, exoskeletal, with vestigial bone structures on their heads. They also had the ability to change their skin colour, blending, like chameleons, with their surroundings.

Society
The Eutermesans were the slave force of another race, the termite-like Kromon, and were mostly farmers.