Doctor Who (2005– )
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Cold Blood 

The Doctor and Nasreen Chaudry go deep underground and find an ancient society that has been disturbed by the drilling. They are gassed and taken prisoner just as Amy manages to free ... See full summary »


Ashley Way


Chris Chibnall




Episode complete credited cast:
Matt Smith ... The Doctor
Karen Gillan ... Amy Pond
Arthur Darvill ... Rory
Neve McIntosh ... Alaya / Restac
Meera Syal ... Nasreen Chaudhry
Robert Pugh ... Tony Mack
Nia Roberts Nia Roberts ... Ambrose
Richard Hope ... Malohkeh
Stephen Moore ... Eldane
Alun Raglan ... Mo
Sam Davies Sam Davies ... Elliot (as Samuel Davies)


The Doctor and Nasreen Chaudry go deep underground and find an ancient society that has been disturbed by the drilling. They are gassed and taken prisoner just as Amy manages to free herself. The military commander of the underground reptilians, Restac, is convinced that the "apes' - their term for humans - are an invading force. Calmer heads prevail and the Doctor manages to negotiate a truce pending the transfer of prisoners which he, and some of the more pacifist members of the reptilians, hopes will lead to a lasting peace. The only problem is that Alaya, the reptile prisoner has been killed and Restac is ready to go to war. Written by garykmcd

Plot Summary | Add Synopsis


TV-PG | See all certifications »






Release Date:

29 May 2010 (UK) See more »

Company Credits

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Technical Specs


Sound Mix:

Dolby Digital | DTS (DTS HD MASTER AUDIO 5.1 Mix)



Aspect Ratio:

16:9 HD
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Did You Know?


The Doctor asks the Silurian scientist if he has any celery. This refers to the habit of the Fifth Doctor, who always wore a sprig of celery. The celery was a cure for several poisons that affect Time Lords. See more »


According to The Doctor in "Flesh and Stone", Amy can remember the clerics and the Weeping Angels who fall into the space/time crack because she's a time traveler. Yet in this episode she forgets Rory after he's absorbed by the crack, which is explained as Rory was from Amy's personal life and the Clerics and Angels weren't. The Doctor explained this as he tried to keep Rory in Amy's mind, trying to help her remember him. See more »


Restac: Do you understand who we are?
Rory Williams: Sort of. A bit. Not really.
See more »


Featured in The Culture Show: Me, You and Doctor Who (2013) 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

Unispired but not without It's surprises
30 May 2010 | by The-Last-PrydonianSee all my reviews

After last weeks entertaining and promising if flawed opening to this two part story, "Cold Blood" carries on from where "The Hungry Earth" an episode which owed much to the classic B-movie "Invaders from Mars", writer Chris Chibnall continues with the tale to deliver what ultimately culminates in a shockingly powerful and emotional denouement. To some extent a lightweight story with some hairy moments it eventually goes to some very dark places very quickly with a story that neatly exploits the fragility and basic flaws of human nature and the brutality and hatred that prejudice can instill in people.

Starting where the previous episode left, with the Doctor and Nasreen Chaudry, head of the mining expedition seen the previous week, having discovered that all tat consists of the Silurian race is not a mere tribe but a whole civilisation. In an attempt to prevent a potential war the Time Lord intends to exchange a Silurian who he along with the humans had captured in return for the humans in their possession who include Amy. The Silurian's as revealed before want control over the Earth again and plot to exterminate every single human off the face of the planet but the Doctor wishes to broker a deal which would allow both humans and Silurians to share the planet. But achieving such an aim might be more difficult than imagined. Especially when the worst that can happen, does.

"Cold Blood" marks the best script penned by Chibnall thus far when you consider some of his less rewarding work on "Torchwood" for example. It's tightly paced, with sympathetic and likable characters and although it occasionally wallows in sheer cheesiness and arguably relies on the odd plot contrivance to further it's basic yet effective plot, it's never the less a tort and thrilling run around. There are ultimately a number of the predictable clichés which come with a story regarding what is essentially the clash of two cultures who eventually have to fight to find some common ground. The fact that the Silurian prisoner Alaya is actually the sister of Resctac the military commander of the reptilian race seems all too convenient a plot device to provoke further animosity while Restac her self as with her sister are never properly developed and come across as just two angry two-dimensional caricatures who merely spit out venomous bile about humans. And there are of course the requisite, more benign Silurian protagonists although given the plot are more or less a necessity.

It's thank god then that the stories denouement partially makes up for these flaws with a chilling and emotional climax which would hopefully silence detractors who have accused the show as being too sugar coated and aimed at kids. Like "The Waters of Mars" it has an exceedingly grim conclusion although arguably more effectively handled and less heavy handed, utilising the tale to include the cracks in time seen throughout the series beautifully. The episode nicely exploits the callousness and perhaps the ultimate futility of war when understanding and diplomacy would be better used with Smith's Doctor playing mediator or peacemaker. Even the humans and not simply the Silurians are not totally depicted as being entirely good or bad and the shades of grey that consist in every one of us are employed with sublime craftsmanship as with nobility seen on either side.

The performances as has more or less been seen to be through out the fifth series are uniformly excellent with both Smith and Gillan once again proving to be as ever dependable in their respective roles with Gillan in-particular worthy of note giving it her all in the stories shocking climax. As is the same can be said for Arthur Darvill as Rory who proves to be growing to be more and more endearing. Inspired support as displayed in THE from Meera Syal, Robert Pugh, Nia Roberts et al while Samuel Davies as young Elliot may very well be an up and coming name to look out for in future. And It's largely due not only Davies likable performance but Chibnalls characterisation that Elliot doesn't slip in to the usual pitfall of an irritating, contrived child protagonist.

A solid then if not overwhelming classic episode which neatly concludes this two parter CB highlights the upward spiral of the Moffat era. Enjoyable, intelligent although perhaps hardly inspired or original it's never the less without it's surprises and with hints that the best and most shocking might be yet to come I can only hope Moffat delivers on his promise.

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