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.
Voyage of the Damned (Doctor Who)
Clive Swift and Geoffrey Palmer have had previous roles in "Doctor Who". Swift portrayed Jobel in "Revelation of the Daleks" (1985), while Palmer played Undersecretary Masters in "Doctor Who and the Silurians" (1970), and the Administrator in "The Mutants" (1972). Jessica Martin had played Mags in "The Greatest Show in the Galaxy" (1988–89). In addition, Bernard Cribbins played Tom Campbell in "Daleks' Invasion Earth 2150 A.D.", the second "Doctor Who" feature-film adaptation starring Peter Cushing as well as Arnold Korns in the audio play "Horror of Glam Rock". Colin McFarlane, who provided the voices of the Heavenly Host for the episode, went on to play General Pierce in "" (2009), before later reappearing in "Doctor Who" as Moran in "Under the Lake". Jimmy Vee had previously played aliens in "The End of the World" and "Aliens of London" (2005), and would later play other aliens in "The End of Time" (2009–10) and "The Caretaker" (2014).