The kitlings resembled large black house cats with yellow eyes. The kitlings could teleport from planet to planet like the Cheetah People though it seems the kitlings did not have the Cheetah People's limitations as far as having to have a link with a planet in order to travel there.
They were scavengers that used their powers to find carrion on different planets. The Cheetah People could also telepathically control the kitlings and could see through their eyes. They used the kitlings to find new sources of food, while the kitlings fed off the scraps. The kitlings were bred by an unknown civilisation on the Cheetah People's planet for spying purposes, though that civilisation eventually collapsed.
In 1989 the Master used them to take humans from Earth to The Cheetah World so that he could bond with them and use them to escape the planet. Several remained on Earth hunting for humans while the Master had his own personal Kitling for a while he could have used it to travel to Earth but instead he used Midge. Some remained on Earth others escaped to other planets after The Cheetah World was destroyed. (DW: Survival)