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 (series 2)
This is the first series to feature David Tennant as the tenth incarnation of the Doctor, an alien Time Lord who travels through time and space in his TARDIS, which appears to be a British police box on the outside. He continues to travel with his companion Rose Tyler (Billie Piper), with whom he has grown increasingly attached. They also briefly travel with Rose's boyfriend Mickey Smith (Noel Clarke), and Camille Coduri reprises her role as Rose's mother Jackie. The series is connected by a loose story arc consisting of the recurring word "Torchwood". This is also the first series to be preceded by a Christmas special, which was commissioned to see how well the show could do at Christmas. The success of "The Christmas Invasion" led to the Christmas special becoming an annual tradition.
Two mini-episodes were also recorded: "Doctor Who: Children in Need" was produced for the 2005 Children in Need appeal, and interactive episode "Attack of the Graske" was recorded for digital television following the broadcast of "The Christmas Invasion". 13 "TARDISODEs" were also produced to serve as prequels to each episode. All episodes were filmed as part of the second series' production cycle.
Series two was David Tennant's first in the role of the Doctor after he was cast on 28 April 2005. Following his brief appearance in the closing moments of "The Parting of the Ways" he was next seen in the , broadcast on 18 November 2005. "The Christmas Invasion", broadcast one month later, marked his first full episode.