Tzun

The Tzun were a humanoid race native to S'Arl. Shortly after achieving space travel circa 23,000 BC, they fought the Darklings of Yuggoth, which corrupted their DNA. They perfected genetic engineering and began integrating new species into their Confederacy by combining their DNA with theirs.

In 1957, the Tzun attempted to invade Earth with the aid of the Master, but were defeated by the Doctor. (NA: First Frontier)

In 1983, a Tzun, nicknamed Tony, was a member of Isaac Summerfield's team. (NA: Return of the Living Dad)

In 2172, the Tzun attempted to conquer the Veltrochni, but were wiped out by them. (NA: First Frontier)