Doctor Who (2005– )
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The Poison Sky 

With planet Earth choking under the poison sky, the Doctor must stop the Sontarans' threat to the planet.


Douglas Mackinnon


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

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Episode cast overview, first billed only:
David Tennant ... The Doctor
Catherine Tate ... Donna Noble
Freema Agyeman ... Martha Jones
Billie Piper ... Rose Tyler
Bernard Cribbins ... Wilfred Mott
Jacqueline King ... Sylvia Noble
Ryan Sampson ... Luke Rattigan
Rupert Holliday-Evans ... Colonel Mace
Christopher Ryan ... General Staal
Dan Starkey ... Commander Skorr
Clive Standen ... Private Harris
Wesley Theobald ... Private Gray
Christian Cooke ... Ross Jenkins
Meryl Fernandes Meryl Fernandes ... Female Student
Leeshon Alexander ... Male Student


The Sontarans launch the attack with their poison gas slowly encircling the Earth. They've also taken the TARDIS to its headquarters but don't realize that Donna is inside. The Doctor realizes that the Sontarans have cloned Martha. He knows that fighting the Sontarans is of little use as they never surrender and are prepared to fight until they win. He decides to try and burn the poison gas that now encircles the Earth and with the help of the Sontarans teleportation system, send them a little surprise as well. At the end of it all, both Martha and Donna have to decide if they want to stay with the Doctor. Written by garykmcd

Plot Summary | Plot Synopsis


TV-PG | See all certifications »

Parents Guide:

View content advisory »


Release Date:

30 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)
See full technical specs »

Did You Know?


Wilf's role in the story was originally intended for Geoffrey Noble. This was amended after Howard Attfield's death. See more »


All through the atmos fog segments outside Donnas house there is a car with its lights on opposite her mothers car but when the fog is clearing it is gone. See more »


Clone Martha: [having trouble speaking] My heart... is getting slower.
Martha Jones: [apologetic] There's nothing I can do.
Clone Martha: In your mind you've got so many plans. There's so much that you want to do.
Martha Jones: And I will. 'Never do tomorrow what you can do today' my mum says cause...
Clone Martha: 'Cause you never know how long you've got'... Martha Jones... all that life...
[heart finally gives out; head drops as she dies]
See more »

Crazy Credits

SPOILER: Billie Piper receives screen credit as Rose Tyler, even though her appearance in the episode lasts less than one second. See more »


Featured in Doctor Who Confidential: Sontar-Ha! (2008) See more »


Doctor Who Closing Credits
Written by Ron Grainer
Performed by BBC National Orchestra of Wales
See more »

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User Reviews

Excellent production values and acting terrible script
23 September 2012 | by Dexter099See all my reviews

Like in most television episodes, this one is let down by the abysmal writing. Just before they die, b ad guys have a complete turn of heart, as though the ideas they cling to are able to be flipped thanks to a moment of compassion.

The not-so-subtle anti-technological undertones are apparent in the script as evil capitalist cars are used to kill the planet, with the atypical big bad military taking a nice big hit as well.

Thankfully, the script editor seems to have reoriented Ms. Raynor back towards actually writing a Doctor Who episode and so Tennant and a big crew manage to make some excellent entertainment.

But why, oh why, do the linguists always have to suck...

4 of 13 people found this review helpful.  Was this review helpful to you? | Report this
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