

The Doctor also held out hope that he could rehabilitate the Master, whom he had once considered a friend.

The Master reflected an equally casual attitude back at him. Although appalled by the disregard for life inherent in the Master's schemes, the Doctor treated their relationship as somewhat of a friendly rivalry, even enjoying their battle of wits. His foremost enemy was a fellow Time Lord, the Master. Unlike his earlier incarnations, he was quite willing to engage others physically, and cut a more dashing figure. This Doctor worked for UNIT as their scientific advisor, and indeed, he even remained in their service after his exile was ended.

At the same time, he continued trying to regain his freedom. However, he retained his endearing compassion toward his human companions, and he finally began to gain some mastery over his TARDIS as he dissected its inner workings while it was rendered inoperable, as the approximately three years of time he spent in exile gave him the opportunity to learn more about his ship than he had ever known before, since he was no longer constantly on the move from his people. The technological limits of the time period, and the constraints of his exile, often made this incarnation of the Doctor frustrated and bitter. Those who got on his good side soon found him to be a friendly fellow, while those who were against him soon found that this gentleman could actually get physical and hold his own in a fight.

He also liked to share his wisdom with those who had open minds, but his patience would quickly dissolve if something annoyed him. The Third Doctor, who was exiled by the Time Lords to Earth in the 20th century for a significant period of his life, was a distinguished man of high class and gadgetry, often tinkering away and privy with machines.
