The Sontaran Stratagem (TV story)

Synopsis
While Donna meets Martha Jones for the first time, the Doctor encounters a longtime enemy...

Plot
While Donna meets Martha Jones for the first time, the Doctor encounters a longtime enemy, the Sontarans who are looking for the Rutan Host on Earth, and when some UNIT soldiers are mind controlled and take away Martha for cloning, the military force UNIT arrive and wage war on the Sontarans.

Cast

 * The Doctor - David Tennant
 * Donna Noble - Catherine Tate
 * Martha Jones - Freema Agyeman
 * General Staal - Christopher Ryan
 * Commander Storr -

Production crew
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Story notes

 * This episode marks the first television appearance of the Sontarans in 23 years. Their last appearance was in The Two Doctors, however the last time they are refered to was in 2007s' "The Sarah Jane Adventures".
 * Helen Raynor will write this episode. Her Series 3 episodes Daleks in Manhattan and Evolution of the Daleks both occupied fourth and fith episode in the series. This two part episode also occupies episode four and five.

Ratings
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Myths
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Filming locations
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Continuity
Martha Jones is introduced in the 2007 series of Doctor Who, first appearing in the episode "Smith and Jones". When the hospital she works at is teleported to the Moon, medical student Martha helps save the day alongside an alien time traveller known only as the Doctor Martha Jones last appeared in a Day in the Death(Torchwood) and Last of the Timelords (Doctor Who) this will be her first appearance in series four. the Sontarans first appearence for 23 years.

The Sontarans made their first appearance in 1973 in the serial The Time Warrior by Robert Holmes. There, it was explained that they are a race that reproduces by means of cloning rather than by means of sexual reproduction. They live in a militaristic society obsessed by war. Sontarans are humanoid, with a squat build and distinctive dome-shaped head. They come from a high-gravity world named Sontar in the "southern spiral arm of the galaxy", and are far stronger than humans. They recharge their energy through a "probic vent" at the back of the neck rather than by eating food; they also use this vent in their reproduction process. The Sontarans have been at war with the Rutan Host for thousands of years. In the episode The Invasion of Time, the Sontarans successfully invaded Gallifrey, but were driven out again after less than a day.

Discontinuity, Plot Holes, Errors
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DVD, video, and audio releases
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