Patrick Troughton

Played the Doctor from 1966 - 1969

The 1st Doctor grew progressively weaker while battling the Cybermen during the events of The Tenth Planet and eventually collapsed, seemingly from old age. His body renewed itself and transformed into the Second Doctor.

Initially, the relationship between the Second Doctor and his predecessor was unclear. In his first story, the Second Doctor referred to his predecessor in the third person as if he were a completely different person. His companions Ben and Polly are at first unsure how to treat him and it is only when a Dalek recognises him that they accept that he's the Doctor.

He has been nicknamed the "Cosmic Hobo",  as the impish Second Doctor appeared to be far more scruffy and child-like than his first incarnation.

Mercurial, clever, and always a few steps ahead of his enemies, at times he could be a calculating schemer who would not only manipulate people for the greater good but act like a bumbling fool in order to have others underestimate his true abilities.