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.
Sylvester McCoy
McCoy became the Seventh Doctor after taking over the lead role in "Doctor Who" in 1987 from Colin Baker. He remained on the series until it ended in 1989, ending with "Survival" (see List of Doctor Who episodes (1963–1989)). As Baker declined the invitation to film the regeneration scene, McCoy briefly wore a wig and appeared, face-down until the last moment before the regeneration commenced, as the sixth Doctor. He played the Doctor in the 1993 charity special "Dimensions in Time", and again in 1996, appearing in the beginning of the "Doctor Who" television movie starring Paul McGann as the Eighth Doctor.