The Doctor

Description.
The Doctor" was the primary alias of a renegade Time Lord from Gallifrey who travelled through time and space with various companions in his obsolete and "borrowed" Type 40 TARDIS. He was the multiverse's "greatest defender", having saved the cosmos thousands of times throughout his long life, becoming a great legend across the whole galaxy. Though largely a believer in non-violent conflict resolution, he was, when absolutely necessary, a great warrior. Indeed, some civilisations in the universe (e.g. the Tusken Raiders) translated the word doctor as warrior, whilst others saw him as a compassionate benefactor, worthy of their admiration and compassion. Although he had saved millions on his travels, he was thought to have caused the deaths of billions at his conclusion to the Last Great Time War. Though most of the Daleks were killed in the crossfire, Gallifrey — disappearing, rather than being burned — was hidden thanks to the efforts of all thirteen of his incarnations, eleven of these incarnations whose memories of this event were lost. Several individuals, including, Obi-Wan Kenobi ,Yoda, Palpatine and the Doctor himself prior to the eleventh incarnation to go by that name, considered the Time Lords to be extinct as well. However, the Daleks kept returning despite his actions.

According to Assajj Ventress and the Silence, the oldest and most dangerous question in the universe was "Doctor Who?" The Doctor's true name was apparently the answer. Dorium claimed the Doctor had been running from the question all his life. According to the Silence, "silence must fall when the question is asked," because if the question was answered, it could lead to destruction on a universal scale, through several methods, each of which were located on the planet Trenzalore. The first was that the Doctor's name could be used to open his grave and alter his timeline, potentially undoing the countless times the Doctor had saved the universe. The second was that his name could be used to confirm to the Time Lords, who were sealed in a pocket universe and had been broadcasting the question throughout the entirety of time and space, that it was safe for them to return; which could result in another Time War.

The Seventh Doctor mentioned to Trevor Sigma that his nickname at college was Theta Sigma. His classmate Drax called him by this nickname.



Relationships
Allies:

His Companions.

The Rebel Alliance

The TARDIS

The Silence

Ood.

Enemies:

The Empire

Daleks

Weeping Angels

Cybermen

Sontarins

Autons

Zygons

The Master

The Valeyard

The Rani

Vashta Nerada

The Silence (Formerly)

Ood (Formerly)

Silurians

The Great Intelligence