When he arrived there in his Time Lord-built spacecraft, K-NEL, K9 discovered that the world was populated by a range of Earth animals that were from widely varying moments in evolutionary history. Sabre-toothed tigers and mammoths, for instance, lived alongside pygmy hippos and rhinoceroses. K9 agreed to comply with their request before setting off for his home dimension. (PROSE: K9 and the Missing Planet)