Peter Malcolm Gordon Moffett, known professionally as Peter Davison, is an English actor with many credits in television dramas and sitcoms. He made his television acting debut in 1975 and became famous in 1978 as Tristan Farnon in the BBC's television adaptation of James Herriot's All Creatures Great and Small stories. He subsequently played the fifth incarnation of the Doctor in Doctor Who from 1981 to 1984.

All Creatures Great and Small is a British television series made by the BBC and based on the books of the British veterinary surgeon Alf Wight, who wrote under the pseudonym James Herriot. Set in the Yorkshire Dales and beginning in the mid-1930s, it stars Christopher Timothy as Herriot, Robert Hardy as Siegfried Farnon, the proprietor of the Skeldale House surgery, and Peter Davison as Siegfried's "little brother", Tristan. Herriot's wife, Helen, was initially played by Carol Drinkwater and in the later series by Lynda Bellingham.