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.
Eighth Doctor
The TV film did not lead to the commissioning of a revived television series, and while Eighth Doctor stories continued in other media, "Doctor Who" did not air again on television until 2005. After this, footage and stills from the TV film would be used in later episodes "The Next Doctor" (2008), "The Eleventh Hour", "The Lodger" (both 2010) and "Nightmare in Silver" (2013). Edited archive footage in "The Name of the Doctor" very briefly shows the Eighth Doctor sharing an adventure with the Second Doctor (Patrick Troughton).