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.
Fourth Doctor
The Fourth Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television series "Doctor Who". He was portrayed by Tom Baker for seven consecutive seasons, which remains the longest tenure of any actor to portray the lead, counting both the classic and modern series. He was considered to be the most recognisable and iconic incarnation of the Doctor both in the United Kingdom and internationally.