Second Doctor

The Second Doctor is the second incarnation of the Doctor to appear in Doctor Who and the main protagonist of Season 4 to Season 6. He returns as a major character in the 10th Anniversary Special, The Three Doctors, the 20th Anniversary Special, The Five Doctors and a supporting character in Season 22.
He was portrayed by the late , who also played Robin Hood in the 1953 BBC series, and voiced Winston Smith in the BBC Home Service adaptation of 1984. He would be voiced in Big Finish by Frazer Hines, who played Jamie in the TV series, and Patrick's son Michael Troughton in the Second Doctor Adventures. 
==History==
The Second Doctor regenerated from the First Doctor after his ailing health caught up to him on Mondas.
The Second Doctor's first adventure saw him saving the human colony on Vulcan from the Daleks. Later on, the Second Doctor and his companion were captured by the Daleks, who sought to understand the "Human Factor" possessed by humans that enabled them to triumph over the Daleks repeatedly and hoped to use the Doctor order to do so. After the Daleks used the Doctor to ascertain the Human Factor, the Doctor found himself facing the Dalek Emperor, who revealed the true purpose of the experiment was to use the Human Factor to isolate the "Dalek Factor" and implant it into humans. However, the Doctor was able to turn the tables on the Dalek Emperor by planting the "Human Factor" into more Daleks, triggering a civil war within the Dalek Empire that seemingly saw the Daleks destroyed.
Although the Second Doctor faced the Daleks multiple times, his most persistent foes were the Cybermen originating from Telos, whom the Doctor faced off against in at least four instances, including one which saw him encountering the leader of the Cybermen, the Cyber-Controller. Other foes the Second Doctor repeatedly encountered were the Great Intelligence, a malevolent bodiless consciousness, and the Ice Warriors originating from Mars.
Eventually, the Second Doctor found himself up against a race of aliens led by the War Lord, who was abducting soldiers from various points in Earth's history to build an army. Assisting the War Lord was the War Chief, a renegade Time Lord whom the Doctor had a history with. Unable to thwart the War Lord on his own, the Doctor reluctantly called upon his own people, the Time Lords, to help. After the Time Lords dealt with the War Lord however, they took the Doctor into custody and put him on trial for violating the Time Lord policy of non-interference in the history of other races. The Doctor was convicted and sentenced to exile on Earth, as well as forced to regenerate again. 
Several stories made after his TV tenure, beginning with several Multi-Doctor tv serials, indicated the Second Doctor was used by the Time Lords as an agent before exiling him. In The Three Doctors, he had a rough relationship with his next incarnation when battling Omega, he and an older Brigadier were forced to play the Game of Rassilon in The Five Doctors.
==Personality==
The Second Doctor's outward personality was quite jovial, with him being very friendly to those he encountered and often behaving in a buffoonish manner. Beneath his clownish persona however, the Second Doctor had a more serious and cunning side, one which he deliberately kept hidden in order to seem unassuming and better enable him to carry out his complex plans.
==Quotes==
==Trivia==
*Patrick Troughton was personally approved by William Hartnell, the First Doctor's actor, to succeed him in the role.
*Patrick Troughton's portrayal is frequently cited as an inspiration for later incarnations of the Doctor, not least Matt Smith, who based his performance of the Eleventh Doctor on Troughton. 
*Initially the Second Doctor was presumed to be the younger version of the First Doctor; regeneration had been solidified as a concept until Troughton said he wanted to leave after three seasons. Thus it became a staple of the series to keep it going.
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