A huge civilisation, as the Master described them, built their cities on the Cheetah World, covering the whole planet. They possessed an empire with fleets of starships, and developed their mental powers to a remarkable degree, including the power of telepathy and control.
They developed a mind link with the kitlings and thought they could live in the wilderness and control it, but the wilderness broke in on them and they became Cheetahs, as did anyone else who survived on the planet. Eventually their cities became ruins as the Cheetahs fought for generations, tearing the planet apart. (PROSE: Survival, TV: Survival)