- You may be looking for the predatory, non-sentient cats.
The tigers were nearly wiped out, but two were able to escape to Earth, later to be known as Lady Huntingdon and Bella Huntingdon. Lady Huntingdon planned to find a way back in time and tried to steal Iris Wildthyme's TARDIS. The Fourth Doctor was able to seal her inside a message pod. Her granddaughter stayed on Earth and married Turner, Iris' abandoned companion. (PROSE: Old Flames)