Cessair of Diplos

Cessair is a criminal from Diplos, wanted for counts of murder and for the theft of the Great Seal of Diplos (actually part of the Key to Time). She was able to escape Diplos and take 3 Ogri from Ogros (breaking more laws in the process). She was also able to capture the beings sent to capture her and kept them in spaceship in hyperspace. This spaceship was parked above Earth, where Cessair waited.

Cessair hid out on Earth for 4,000 years, using the Great Seal of Diplos to change her appearance when she needed to. These identities included Cailleach, the Celtic war goddess. Despite the changes in identity, she always controlled the stone circle where the Ogri rested and where the spaceship was parked. She was eventually discovered by the Doctor and was sentenced to perpetual imprisonment among the stones.