When is the Doctor?
The Fourth Doctor
See the universe. Meddle in the affairs of galactic overlords and annoying bureaucrats. Offer jelly babies to people and things that are unlikely to want a jelly baby at that precise moment.
Cantankerous and eccentric. The Doctor loves to keep people off balance by doing and saying strange things at odd times. He also hates being told he is wrong, especially when he is. He is a passionate creature of extremes and mood swings. When involved in a crisis he is hard to keep up with, always running when he might walk. But in calmer times he is very hard to rouse from a game of chess or an afternoon of fishing.
The Doctor never quite seemed to recover from his regeneration, remaining more eccentric and prone to mood swings than usual. Even so, in this incarnation he fought seemingly every type of foe in the universe. This incarnation was charged with universe-shaking quests, such as collecting the parts to the key to time, and travelled beyond the boundaries of the universe into E-space. He also returned to Gallifrey several times and, for a time, travelled with another of his people, Romana. After so many adventures and so many deadly enemies, it is almost ironic that his next regeneration should be caused by something as mundane as a fall.