Doctor Who (2005– )
10 user 7 critic

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
See full technical specs »

Did You Know?


The actors portraying Silurians in previous stories didn't wear masks. The masks here helped save time and money since the actors wearing masks didn't require as much time in make-up. See more »


(Around 31 minutes) as they are running from the Silurians the position of the sonic screwdriver varies from upright in the frontal shots to pointing horizontally in the over the shoulder shots. See more »


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


References Doctor Who: The Pandorica Opens (2010) 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

Gone in the blink of an eye...
31 August 2015 | by Sleepin_DragonSee all my reviews

A moral questioned is being asked, Alaya the Silurian that attacked and injured Tony, is being held prisoner up on the surface, Tony and Ambrose his daughter have reason to kill her, as does Rory because of Amy being taken. The Doctor and Nasreen have travelled down to the base of The Silurians, to seek the missing people. Having discovered there is a full Silurian society, they are imprisoned. Naturally The Silurian on Earth pushes somebody's buttons, and the Doctor's lost his bargaining tool.

I'd have to praise the little guy that played Elliot, possibly the most interesting character of the lot. Kid did a great job. I'd also like to praise Nia Roberts, little dubious in Part 1, but she was very good in this better scripted episode.

Second best bit, Nasreen and Amy discussing the future of Earth and Silurians with the Silurian leader. A great scene, really well played out. However they saved the best til last, the crack in the wall rears its ugly head once again, and the worst thing happens... It makes the opening of Part 1 seem relevant.

Silurian culture is very interesting, I praise Chris Chibnall for creating an interesting Silurian Society, there are different factions, different ideas and infighting.

I wasn't entirely in love with Part 1, I was fairly bored for most of it, and same for the best part of this one too. Watching it I keep thinking 'we've been here before, nothing original on show. The action scenes are pretty good, but overall it's just unsatisfying, it was too long over two episodes. 6/10

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