Definition
Although the term "companion" is designated to specific characters by the show's producers, and appears in the BBC's promotional material and off-screen fictional terminology, there is no formal definition that constitutes such a designation. Stephen Brook in The Guardian newspaper's Organgrinder blog discounted Michelle Ryan as a likely next companion but said that "what constitutes a Doctor Who companion is no longer clear" The definition of who is and is not a companion becomes less clear in the newer series. During the Doctor's three latest incarnations, his primary companions Rose Tyler, Martha Jones, Donna Noble, Amy Pond and Rory Williams have fulfilled a distinct dramatic role, more significant than other, less-prominent TARDIS travellers such as Adam, Jack, and Mickey. The British press referred to Martha as the "first ethnic minority companion in the 43-year television history of Doctor Who" and the "first black assistant", despite the presence of Mickey Smith in the previous season—including several episodes in which he travelled in the TARDIS with the Doctor.
The Brigadier was included as a companion in the Making of Doctor Who, published in the 1970s.
The opening credits do little to clarify the situation. In the first two series of the renewed programme, the only supporting actor to receive a title credit is Billie Piper. In subsequent series, Freema Agyeman and Catherine Tate are credited in all episodes in which they appear. In the third series John Barrowman receives a title credit for his return to the show. Series Four gave Agyeman, Piper, Barrowman, and Elisabeth Sladen title billing for each of their reappearances. Noel Clarke reprised his role in the Series Four finale; although listed as a companion alongside the other actors on the BBC Doctor Who website, Clarke is not credited in this way. In The End of Time John Simm receives title billing for his antagonist role as the Master, ahead of Bernard Cribbins as companion Wilfred Mott.
Companions in the new series also have a more flexible tenure than their classical predecessors. Several companion characters have returned to the series after leaving the Doctor's company, most notably in the Series Four finale "The Stolen Earth" / "Journey's End", which features the return of Rose, Martha, Jack, Sarah Jane and Mickey. This tendency, plus the increase in "one-off" companions like Astrid Peth and Jackson Lake, has further obscured the matter of who is and is not a companion, and when.
Read more about this topic: Companion (Doctor Who)
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