Eutermesan

Eutermesans are a humanoid species native to Zone Eutermes, an annexe of a universe existing 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 are a race of reptilian humanoids, exoskeletal, with vestigial bone structures on their heads. They also have the ability to change their skin colour, blending, like chameleons, with their surroundings.

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