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"The Sontaran Stratagem" is the fourth episode of the fourth series of the British science fiction television series ''Doctor Who'', which depicts the adventures of a time-travelling humanoid alien known as the Doctor. The episode was broadcast on BBC One on 26 April 2008. The episode and its sequel, "The Poison Sky", were written by Helen Raynor, who previously wrote the linked episodes "Daleks in Manhattan" and "Evolution of the Daleks" in the third series. "The Sontaran Stratagem" features the first appearance of the alien Sontarans to the series since the 1985 Colin Baker story ''The Two Doctors'', as well as former companion Martha Jones (Freema Agyeman), last seen in "Last of the Time Lords". The episode takes place on present-day Earth, where Martha and UNIT summon the Doctor (David Tennant) for assistance concerning ATMOS (Atmospheric Omission System), a revolutionary piece of green technology installed in 400 million cars worldwide. ATMOS is later revealed to be part of a Sontaran plot to poison the atmosphere. Show runner Russell T Davies had considered making the Sontarans return since the revival of the series and wanted to show changes in Martha's personality after her departure. The episode was viewed by 7.06 million viewers after its original broadcast, with an Appreciation Index of "87". Critics gave generally positive reviews, praising the return of the Sontarans, Christopher Ryan's portrayal as Staal, and Raynor's writing; some stated Raynor improved from her previous episodes. ==Plot== Martha Jones, a former companion of the Doctor, calls him to ask for assistance during an investigation by UNIT (Unified Intelligence Taskforce). Minutes after the Doctor's craft, the TARDIS, materialises in contemporary Britain, Martha authorises the raid of an ATMOS factory. The Doctor introduces his companion Donna Noble (Catherine Tate) to Martha and UNIT; Donna instantly befriends Martha, but is concerned about UNIT's ethics and asks the Doctor why he is associated with them; the Doctor ambiguously replies he used to work for them in the "70s or 80s." ATMOS is marketing a satellite navigation system developed by young prodigy Luke Rattigan (Ryan Sampson). The system also reduces carbon dioxide emissions to zero; UNIT requested the Doctor's help because the technology is not contemporary and might be alien. UNIT are also concerned about fifty-two simultaneous deaths occurring spontaneously several days earlier. The Doctor travels to Rattigan's private school to investigate the system and discovers that the recent events have been plotted by an alien warrior race known as the Sontarans. The Sontarans are part of a battlegroup led by General Staal, "the undefeated" (Christopher Ryan). Instead of an outright invasion, they are taking control with a combination of human clones, mind control, and ATMOS; Martha is captured by two of the controlled humans and cloned to provide a mole within UNIT. Meanwhile, Donna returns home to warn her mother Sylvia (Jacqueline King) and grandfather Wilfred Mott (Bernard Cribbins) about the Doctor, having been advised to do so by Martha. Concerned about the implications of telling the truth, Donna decides against warning her mother. The Doctor investigates the ATMOS device attached to Donna's car and discovers a secondary function: the device can emit a poisonous gas. Wilfred attempts to take the car off the road, but is trapped when Staal activates all 400 million ATMOS devices installed in cars worldwide. The episode's cliffhanger depicts Donna shouting for help while the Doctor stares helplessly at a street full of cars emitting the gas, while on their ship orbiting the planet, the Sontarans prepare themselves for battle. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「The Sontaran Stratagem」の詳細全文を読む スポンサード リンク
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