The Night of the Doctor

Still trying to skirt around the edges of the Last Great Time War, the Eighth Doctor is forced to fully join the conflict by the mysterious Sisterhood of Karn. Killed while trying to save a woman who hates him simply for being a Time Lord, the Doctor gets to choose what his next incarnation will be like. He arranges for a warrior... but makes the darkest sacrifice of his life in order to be reborn.