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.
Eleventh Doctor
The Eleventh Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television programme "Doctor Who". He is played by Matt Smith, in three series as well as five specials, over an almost four-year-long period. As with previous incarnations of the Doctor, the character has also appeared in other "Doctor Who" multimedia.