"There was this planet, too primal to have a proper name; it's gone now so it doesn't matter anyway. The natives of the planet were cats, some little like tabbies and others sort of like our cheetahs. If you spent any time there you became like them, and the longer you stayed..." She tenses her jaw as she thinks of Midge and Kara, the Mater and the way she almost stayed there, if it hadn't been for the Doctor. "Bugger all."