War Doctor

Originally young and robust, the ninth incarnation of the Doctor, christened the War Doctor by Alice Obiefune, set upon the warrior path for which he had been intended, and disavowed the name "the Doctor". Though the Time Lords and Daleks continued to refer to him by that name, he was also referred to as "the Warrior", the "Doctor of War", and "the Renegade", but, as far as the Doctor was concerned, he had no name.

As he fought alongside the Time Lords, he became regarded as a war hero who commanded a great deal of respect from the Time Lord military. Gastron stated that, during the Time War, the War Doctor was noted for going into battle unarmed, but winning nonetheless, with his unarmed state being the last thing many saw.

After becoming old, battle-weary and faced with the end of reality, the Doctor considered activating the Moment to end the Time War by committing genocide against both the Daleks and his own people. However, the Moment's sentient interface led him down a different path by letting him view his future first-hand. By teaming up with his future selves, his mind was opened to a peaceful way to end the Time War in lieu of the deadly alternative he was going to enact. Teaming up with past and future incarnations, the War Doctor helped to save Gallifrey from destruction; although he was not able to retain these memories, believing himself to have destroyed Gallifrey due to the timeline being out of sync.

After departing from his future incarnations' company, and once again embracing the name of "the Doctor", this incarnation regenerated into a younger body due to advanced old age.