First Doctor

The First Doctor (Also known as William Hartnell, and David Bradley from the end of Season 13 onwards) is one of the Doctors. He makes his first appearance in the fourth episode of Season 7.

Personality
The First Doctor is an unreadable, guarded figure who is slow to trust newcomers at first, but when his trust is earned, he shows himself as an anti-authoritarian with a mischievous streak. He is very protective of young women who remind him of his granddaughter, Susan.

The First Doctor holds himself in high regard and is prone to criticize those who he considers naïve or primitive compared to his level of intellect. However, he possesses compassion, warmth and wit that made up for his egocentric nature, serving to act as a guardian figure.