Second Doctor
The Second Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television series "Doctor Who". He was portrayed by character actor Patrick Troughton.
List of Doctor Who episodes (1963–1989)
"The Smugglers" and "The Tenth Planet" were the last serials to star the First Doctor, his regeneration to the Second occurring in the latter. It is also notable as the season with the most missing episodes, with not one serial existing in its entirety.
The Second Doctor was portrayed by Patrick Troughton, whose serials were more action-oriented than those of his predecessor. Additionally, after "The Highlanders", stories moved away from the purely historical ones that featured during William Hartnell's tenure; instead, any historical tales also included a science fiction element. Patrick Troughton retained the role until the last episode of "The War Games" when members of the Doctor's race, the Time Lords, put him on trial for breaking the laws of time and forced him to regenerate and to be stuck, exiled on Earth.