Artemis (No Future)

Artemis was a Chronovore captured by Mortimus. Mortimus utilised the innate power that the Chronovore had to create an alternate universe in which the Doctor was killed by the Silurian Morka. He also used its power to engineer the resurrection of the Garvond, the empowerment of Huitzilin, and the restoration of the Land of Fiction. He also used its power to release the Vardans from their time loop. Artemis was imprisoned within his TARDIS and released by Ace. It departed Earth in 1976 in Mortemis' TARDIS with the aim of torturing him for keeping it prisoner. (NA: No Future)

Trivia
In mythology, even though Artemis is a greek goddess, she was born from Zeus and the titan known as Leto, making her the duaghter of a titan.