Doctor Who

First Doctor
The First Doctor was portrayed by William Hartnell from 1963 to 1966.

Second Doctor
The Second Doctor was portrayed by Patrick Troughton from 1966 to 1969.

Third Doctor
The Third Doctor was portrayed by Jon Pertwee from 1970 to 1974.

Fourth Doctor
The Fourth Doctor was portrayed by Tom Baker from 1974 to 1981.

Fifth Doctor
The Fifth Doctor was portrayed by Peter Davison from 1982 to 1984.

Sixth Doctor
The Sixth Doctor was portrayed by Colin Baker from 1984 to ?.

Season 22
The show's format changed to 45-minute episodes in this season.

Season 23
The show's reverted back to 25-minute episodes in this season.