After surviving the Eternity War, she returned to the universe to kill the Doctor as punishment for destroying Gallifrey. However after being betrayed by the Cybermen & realising that the Time Lords may still be alive in another universe, she renounced her evil & began working for UNIT alongside General Amanda Powellread more
After surviving the Eternity War, she returned to the universe to kill the Doctor as punishment for destroying Gallifrey. However after being betrayed by the Cybermen & realising that the Time Lords may still be alive in another universe, she renounced her evil & began working for UNIT alongside General Amanda Powell