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.
List of companions in Doctor Who spin-offs
Tom mistook Dr. Who's time machine, Tardis, for a real police telephone box while attempting to foil a jewel robbery. He accompanied Dr. Who, together with the Doctor's niece Louise and granddaughter Susan, to the year 2150, where they discovered that the Daleks had invaded Earth. After helping to defeat the Daleks, Dr. Who returned him to London a few minutes before the robbery was due to take place, enabling him to catch the thieves. The temporal paradox created by this action is not addressed in the film. Cribbins later played Wilfred Mott from 2007 to 2010 in the revived "Doctor Who" television series.