Peter Davison played the protagonist of Doctor Who for 5 years.
The Fifth Doctor is an incarnation of the Doctor , the protagonist of the BBC science fiction television series Doctor Who . Peter Davison . His subsequent starring roles included the sitcoms Holding the Fort and Sink or Swim , the fifth incarnation of the Doctor in Doctor Who , Dr. Stephen Daker in A Very Peculiar Practice and Albert Campion in Campion .