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 Doctor Who audio plays by Big Finish
As well as this, Big Finish started the "" series of full-cast plays, featuring the First Doctor (recast by William Russell and Peter Purves, following William Hartnell's death in 1975) and the Second Doctor (recast by Frazer Hines, following Patrick Troughton's death in 1987), and companions Barbara Wright (recast by Maureen O'Brien and Jemma Powell, following Jacqueline Hill's death in 1993) and Ben Jackson (recast by Elliot Chapman, following Michael Craze's death in 1998), and Russell, Ford, O'Brien, Purves, Marsh, Wills, Hines, Watling and Padbury reprising their roles from the original series. They also started "" series of full-cast plays, featuring Tim Treloar recast as the Third Doctor (following Jon Pertwee's death in 1996), Manning as Jo, and Franklin as Yates.