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 spin-offs
The 2006 and 2007 series were companioned with a CBBC show entitled "Totally Doctor Who". Series 1 was presented by "CBBC" and "Smile" presenter Barney Harwood and "Blue Peter" presenter Liz Barker. For the shows second series Barker was replaced by "SMart" presenter Kirsten O'Brien. During the second series, an animated serial, "The Infinite Quest", was featured. David Tennant and Freema Agyeman reprised their roles from the live-action television series while Anthony Head, a guest star during the 2006 season, returned in a different role.