Fan Casting The Rani

The Rani was a renegade Time Lord and member of the Deca. A brilliant but cold neurochemist, she knew the Doctor and the Master when all three were young, and became an enemy of the former and an unwilling ally of the latter. 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