Frazer Hines
Hines' "Doctor Who" debut came in 1966, when he was cast to play the part of Jamie McCrimmon, the companion of the Second Doctor (played by Patrick Troughton). Originally intended as a one-off guest character, Jamie joined the regular cast and appeared in the series from 1966 to 1969. Hines reprised the role in a cameo in the 20th anniversary serial "The Five Doctors" (1983) and as a guest star in "The Two Doctors" (1985). Hines would appear in 117 episodes of "Doctor Who" in all—more than any other "companion" actor in the history of the series. The only actors appearing in more episodes are those who played the first four Doctors. Many of the episodes featuring Jamie no longer exist in the BBC's collection.
Doctor Who (series 10)
In June 2016, it was announced that Stephanie Hyam would be joining the tenth series. In July 2016, actors Mina Anwar, Ralf Little, and Kaizer Akhtar had been added to the cast and portrayed Goodthing, Steadfast, and Praiseworthy respectively in the second episode. On 16 August 2016, it was announced that David Suchet, famous for his role in "Agatha Christie's Poirot", would appear as a character known as "The Landlord" in the fourth episode, "Knock Knock". Tate Pitchie-Cooper portrayed a child version of The Landlord. Fady Elsayed, who stars in the "Doctor Who" spin-off "Class", was originally set to guest star in an episode of "Doctor Who".