Chumeria

Chumeria, also known as "the Garden Planet of the Universe", was the homeworld of the Chimerons. At some point in its history, it was attacked by the Bannermen and all Chimerions except their Queen, Delta, escaped, with the planet being left barren and rocky.

After defeating the Bannermen on 1959 Earth with the help of the Doctor, she and Billy, a Chimeron converted from a Human, travelled with her daughter, a Chimeron Princess, to the brood planet to breed a new race of Chimerons. Afterwards they returned to their own time and rebuilt their race on Chumeria. (DW: Delta and the Bannermen)