Sycorax leader

The Sycorax leader was a high-ranking Sycorax and led the massive asteroid ship to Earth where they tried to invade it using blood control. He had a duel over Powell Estate in London with the newly-regenerated Doctor and was eventualy defeated. When the Doctor's back was turned, the leader tried again to kill him again but the Doctor used a satsuma from his borrowed dressing gown to hit a button which sent the leader falling to his death. (DW: The Christmas Invasion)