The Ninth Doctor is an incarnation of the Doctor, the protagonist of the BBC science fiction television programme Doctor Who. He is portrayed by Christopher Eccleston during the first series of the show's revival in 2005. Within the series' narrative, the Doctor is a centuries-old alien Time Lord from the planet Gallifrey who travels in time and space in the TARDIS, frequently with companions. At the end of life, the Doctor regenerates; as a result, the physical appearance and personality of the Doctor changes. Eccleston's Doctor was a war-torn loner who disguises his trauma brought on by the Time War using a sense of humour and determination to protect the innocent. The production team's approach to the character and Eccleston's portrayal were highlighted as being intentionally different from his predecessors, with Eccleston portraying the character as being less eccentric.
To fit in with a 21st-century audience, the Doctor was given a primary companion, Rose Tyler (Billie Piper), who was designed to be just as independent and courageous as the Doctor. He also briefly travels with Adam Mitchell (Bruno Langley), a self-serving boy genius who acts as a foil to the companions but ultimately proves unworthy, and Captain Jack Harkness (John Barrowman), a reformed con man from the 51st century. The Doctor, Rose and Jack form a close team but are separated in the series finale in which each character has to make difficult choices and face sacrifice.
The Tenth Doctor is an incarnation of the Doctor, the main protagonist of the BBC science fiction television franchise Doctor Who. He is played by David Tennant in three series as well as nine specials. As with previous incarnations of the Doctor, the character has also appeared in other Doctor Who spin-offs. Tennant's time as the Tenth Doctor is highly regarded among fans of the show and is generally regarded as one of the most iconic incarnations of the character, often ranked alongside Tom Baker's Fourth Doctor
Within the series' narrative, the Doctor is a centuries-old alien Time Lord from the planet Gallifrey who travels in time and space in the TARDIS, frequently with companions. At the end of life, the Doctor regenerates; as a result, the physical appearance and personality of the Doctor changes. Tennant's portrayal of the Doctor is of an outwardly charismatic and charming adventurer whose likable and easygoing attitude can quickly turn to righteous fury when provoked. This incarnation's companions include working class shop assistant Rose Tyler (Billie Piper), medical student Martha Jones (Freema Agyeman), and fiery temp worker Donna Noble (Catherine Tate). He eventually parts ways with them all by the end of the 2008 series finale, "Journey's End", after which he attempts to travel alone for the duration of the 2008–2010 specials before being accompanied by Donna's grandfather Wilfred Mott (Bernard Cribbins) on his final adventure in "The End of Time".
