The Doctor and Rory capture one Silurian, Alaya (Neve McIntosh), and the Doctor instructs Rory and a local family to not harm Alaya, as it could spark a war.
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Steven Moffat contacted Chris Chibnall, asking him to return to writing for Doctor Who.
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In the episode, the Doctor—a time travelling alien played by Matt Smith—and his companions Amy Pond (Karen Gillan) and Rory Williams (Arthur Darvill) land in Wales in 2020, where a drilling operation headed by Nasreen Chaudhry (Meera Syal) is drilling deep into the earth and disrupting a civilisation of Silurians who dwell beneath the earth.
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It was written by Chris Chibnall, who had previously written for Doctor Who and its spin-off series, Torchwood.
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