Doctor Who (2005– )
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The Sontaran Stratagem 

UNIT's newest recruit Martha Jones enlists The Doctor's help to investigate kid genius Luke Rattigan and his ATMOS system that is used in every car on Earth.


Douglas Mackinnon


Helen Raynor, Robert Holmes (character: "The Sontarans")

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Episode complete credited cast:
David Tennant ... The Doctor
Catherine Tate ... Donna Noble
Freema Agyeman ... Martha Jones
Bernard Cribbins ... Wilfred Mott
Jacqueline King ... Sylvia Noble
Ryan Sampson ... Luke Rattigan
Rupert Holliday-Evans Rupert Holliday-Evans ... Colonel Mace (as Rupert Holliday Evans)
Christopher Ryan ... General Staal
Dan Starkey ... Commander Skorr
Eleanor Matsuura ... Jo Nakashima
Clive Standen ... Private Harris
Wesley Theobald ... Private Gray
Christian Cooke ... Ross Jenkins
Radoslaw Kaim ... Worker (as Rad Kaim)
Elizabeth Rider ... Atmos Voice (voice) (as Elizabeth Ryder)


The Doctor gets a call from onetime traveling companion Martha Jones with a request that he return to Earth immediately. She and the military have taken over the ATMOS plant and she needs his help after 52 people around the world all died simultaneously. All had the ATMOS anti-pollution device fitted on their cars so the military has raided the factory believing it to be controlled by aliens. The Doctor learns that the Sontarans are planning to take over the Earth. They take Martha prisoner and she is cloned. Donna meanwhile misses her family and decides to pay them a visit. Written by garykmcd

Plot Summary | Plot Synopsis


TV-PG | See all certifications »

Parents Guide:

View content advisory »


Release Date:

16 May 2008 (USA) See more »

Company Credits

Production Co:

BBC Wales See more »
Show more on IMDbPro »

Technical Specs


| (50 episodes)

Sound Mix:

Dolby Digital (Dolby 5.1)
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Did You Know?


Initially, cloning was going to be a much more persistent element of the story, with the ATMOS factory workers all being clones. Russell T. Davies felt that the clone idea would be more effective in small doses, however, which led to the introduction of the cloned Martha. See more »


When Donna returns home there are no cars visible as she spots Wilfred but when she runs towards him she passes a car on the left side of the street. See more »


Luke Rattigan: [talking to unidentified being over a comms channel] Her name is Jo Nakashima. Freelance journalist. Clever by the sound of it; not as clever as me, but that goes without saying. I... recommend... termination.
General Staal: Remember your status boy. We do not take orders from humans.
Luke Rattigan: I said: recommend.
General Staal: Then your advice shows military wisdom. She will be terminated.
Luke Rattigan: [short breathy laugh] Cool!
See more »


Features Doctor Who: The Fires of Pompeii (2008) See more »


Doctor Who Theme
Written by Ron Grainer
Arranged by Murray Gold
Performed by BBC National Orchestra of Wales
See more »

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User Reviews

26 September 2012 | by identitystaysamysterySee all my reviews

This isn't my favorite episode of season 4 so far. The Sontaran, though being a classic monster of Dr.Who, don't really do much for me. Though being creatures of war and not really having much mercy they don't deliver the same umph that the Daleks and Cybermen do. But the episode wasn't a complete failure! Having two companions in this episode was very interesting and funny at times. It also helped to keep the story along because the Sontarans could not hold my attention for two whole episodes. It's also really suspenseful when you know something that none of the other characters know, but you can't warn them. I won't spoil what it is but it keeps the story moving along. Also this story would've been much better if it woudn't have neen for the American teenager who constantly whined over everything under the sun. Maybe if they would've cut him out and crammed it in to one episode it would've been better!

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