The Hungry Earth

Steven Moffat contacted Chris Chibnall, asking him to return to writing for Doctor Who.[1] Chibnall had previously written the Doctor Who episode "42" as well as episodes of the spin-off series Torchwood.[2] Moffat and executive producer Piers Wenger gave him the brief of Silurians, a drill, and that it was a two-parter.[1] The Silurians were villains who had previously appeared in the 1970 serial Doctor Who and the Silurians and the 1984 serial Warriors of the Deep.[2] For research, Chibnall read the original novel Doctor Who and the Cave Monsters and watched the original serial, noting the freedom writer Malcolm Hulke took with the novel in things he could not have done in the television format. Chibnall wanted there to be a large Silurian city in contrast to the small human village on the surface. Knowing that the Silurians were not as popular and recurring as other villains, Moffat instructed Chibnall to bring the creatures to a new audience, and Chibnall decided to start out with knowing nothing about them and then introducing them in "the most exciting and scary way possible for people who've never seen them before". Chibnall also considered bringing back the Silurians' amphibious cousins the Sea Devils, but decided that doing two races of monster was much tougher and the story was "so clearly about the Silurians and what the Silurians want".[1]

Chibnall, having enjoyed when the Doctor and his companion were separated, made the decision for Amy to be absent for most of the episode. Moffat also thought that, at the point in the middle of the series, it was appropriate to show the Doctor behave differently with other people.[1] A deleted scene, parts of which were shown on the accompanying behind-the-scenes show Doctor Who Confidential, was filmed, depicting Amy discussing with the Doctor how she had seen herself with Rory ten years in the future, and if that would really happen.[3]

With the absence of Amy, Chibnall thought that Nasreen became a "de facto companion".[1] Meera Syal, who was cast as Nasreen, had been a fan of the series since childhood and had been trying to secure a role in the show since its revival in 2005 and was pleased when she received it.[4][5] Syal described her character as "a very high-up, innovative geologist" who became good friends with the Doctor as the two admired each other's passion.[4]

Moffat wanted the Silurians to be redesigned and without their former third eye, as Davros also had a third eye and he wanted the Silurians to be "completely different". They were intended to be a different branch of the same species, and so the original Silurians still existed. Chibnall wrote for the redesigned Silurians to be beautiful and it was intended for the redesign to capture the actors' features and allow them to give stronger performances and differentiate themselves. Chibnall believed that it complemented the theme in the two-parter about how the humans and Silurians were alike and different. Due to the expensive prosthetics needed, extra Silurians wore face masks which prevented the need for every actor portraying a Silurian to receive the facial prosthetics. Chibnall also incorporated a poisonous tongue into the new branch of Silurians.[1]

"The Hungry Earth" and the second part, "Cold Blood", made up the fourth production block of the series and were filmed in late October and November 2009 in the Upper Boat Studios and Llanwynno, Wales.[2] In an interview, Syal stated that they did the location filming first.[4] The drill itself was automatic and done by computer.[6] For the scene in which Amy is dragged underneath the ground, Gillan stood on boxes and lowered herself into a stone compartment. Two pieces of rubber were at the opening of the compartment which expanded as she lowered herself down. A layer of soil was spread across the rubber; Gillan's ears were taped over to make sure the soil did not enter her ears. Gillan, initially scared at performing the stunt, put some of her fear and claustrophobia into the scene as she expected Amy felt the same way.[7]

The episode received mixed reviews from critics. Dan Martin, writing for The Guardian, said that the episode set up an "interesting quandary" but, although many elements were introduced, "not a lot actually seems to happen". He was also critical of the family members and found he did not care about any of them besides Elliot and Nasreen, and although the scene in which Amy was pulled into the ground was "effective and poignant", it left a lack of "Pond-life" in the rest of the episode. However, he did commend the prosthetics department for their redesigned Silurians.[15]

Gavin Fuller of The Daily Telegraph was pleased that it "didn't disappoint" him. He praised the choice to show the Doctor's pacifism and Amy's few but memorable "nightmarish" scenes. However, he was not favourable to Meera Syal's performance and considered the Silurian's redesign too "radical and divorced" from their original appearance, most notably the absence of their third eye.[16]

Patrick Mulkern of Radio Times gave the episode a positive review, saying that it felt "like proper, classic Doctor Who" in terms of "gripping storytelling, terrific pace, spooky direction, a grand idea...a small-scale Earth setting in the near future, characters worth caring about...plenty of meat for the three leads" and "a companion in real peril". He particularly praised the performances of Syal and Smith. He also enjoyed the Silurians' redesign, saying that the old ones "would...look ridiculous today". Though he "missed" the old voice from Peter Halliday, he said he adjusted to Neve McIntosh.[17]

AOL TV reviewer Brad Trechak was positive towards the comparisons that could be made between conflicts throughout history to the human-Silurian conflict, but called the episode a "wasted opportunity". He felt that it was "more suspense and adventure than horror", wishing that it was scarier, and also commented that it was "very simplistic" and did not re-introduce the Silurians as well as it would have, had they been part of the overall storyline.[18]

IGN's Matt Wales rated the episode 8 out of 10, assessing it as a "slender but satisfying success". He said that the narrative was "simplistic" without much depth, but that the "strong supporting cast" and "sympathetic characters" made it a "refreshingly involving tale". He also praised Smith's Doctor, who "delivered admirably" and carried out the show with the absence of Amy.[19]

Ian Berriman for SFX magazine gave the episode three out of five stars, mainly displeased with the redesign of the Silurians, although he was positive toward their "venomous tongue lash" and costume. He also criticised the "clunky" scripting and questioned some technical aspects. However, he praised the scene of Amy being dragged into the earth, as well as Alaya's hunt for Elliot in the graveyard and the interaction between the Doctor and Elliot.[20]