Day of the Moon

The Eleventh Doctor and his allies, Amy, Rory, River Song and ex-FBI agent Canton Everett Delaware III, escape the girl in the space suit, and spend three months tracking down the alien religious order the Silence and find they exist across the entire planet, and have the ability to place post-hypnotic suggestions in humans they encounter. While the Doctor alters part of the command module of Apollo 11, Canton and Amy visit a nearby orphanage in Florida, hoping to find where the girl in the space suit was taken from. The Silence kidnaps Amy, taking her to an underground control room. Canton shoots and wounds one of the creatures, and from it the Doctor learns the Silence's name.

Analysing the now-empty space suit, River realises that the girl possesses incredible strength to have forced her way out of it, and that the suit's advanced life-support technology would have called President Nixon as the highest authority figure on Earth when the girl got scared. The Doctor realises why the Silence have been controlling humanity; by guiding their technological advances, they have influenced humanity into the Space Race for purposes of building a space suit, which must somehow be crucial to their intentions. Meanwhile, Canton interrogates the captured Silence member, who mocks humanity for treating him when "...you should kill us all on sight". Canton records this using Amy's mobile phone.

The Doctor tracks down Amy's location, and lands the TARDIS in the Silence's control room five days later. As River and Rory hold the Silence at bay, the Doctor shows them the live broadcast of the Moon landing. As they watch, the Doctor uses his modification of the Apollo command module Columbia to insert Canton's recording of the wounded Silence member into the footage of the landing. Because of this message, humans will now turn upon the Silence whenever they see them. The group frees Amy and departs in the TARDIS, while River kills all the Silence in the control room. Amy, telling the Doctor that while she is not pregnant, she worries that if she is pregnant, her travels in the TARDIS might affect her child's development. As the trio sets off, the Doctor discreetly uses the TARDIS scanner to attempt to determine if Amy is pregnant. Six months later, the girl in the space suit is in New York, dying. She starts to regenerate to fix her body.

The Silence's 'time engine' set was previously used in "The Lodger".[2] The Doctor describes it as "very Aickman Road", a reference to the house the ship occupied in that episode.[3] When the Silence reveals their name to the Doctor, the Doctor has flash-backs to "The Eleventh Hour" and "The Vampires of Venice", the first mentions of the Silence.[3] The "Eye Patch Lady" (Frances Barber) appears for the first time in this episode, and makes similar appearances in "The Curse of the Black Spot"[4] and "The Rebel Flesh"[5] before her connection to Amy is revealed in "The Almost People".[6] The Doctor uses the TARDIS's scanners to detect Amy's alternating pregnancy state. The Doctor repeats the scan with the same results in "The Curse of the Black Spot"[4] and "The Rebel Flesh".[7]

The Doctor and Rory discuss both being present at the fall of Rome. As an Auton, Rory guarded the Pandorica from the Roman era to the present day in "The Big Bang",[8] and the First Doctor indirectly instigated the Great Fire of Rome in The Romans (1965).[9] The Doctor is held captive in Area 51, which he had visited previously in the Tenth Doctor animated serial Dreamland.[3]

The episode was met with generally positive reviews from television critics. Dan Martin of The Guardian praised the episode for its "action, tension, horror and River Song in a business suit," but felt it "sags a little around the middle."[19] Martin believed the scenes with Amy and Delaware in the orphanage were the "fear factor" of the episode.[19] He later rated it the fourth best episode of the series, though the finale was not included in the list.[20] Morgan Jeffery of Digital Spy stated "after the sensational opening gambit that kicked off the series premiere, it's perhaps unsurprising that 'Day of the Moon' starts with a similarly thrilling onslaught of action."[21] Jeffery was positive towards the nano-recorder, which provided the episode with "a number of unsettling moments in which characters listen back to their own terrified exclamations about the Silents."[21] However, Jeffery felt the final scenes "expose this episode's chief flaw — quite simply, too much is left unresolved."[21] In conclusion, the reviewer stated "While 'The Impossible Astronaut' aced the set-up, 'Day of the Moon' falters slightly in providing the resolution."[21] Jeffery rated the episode four stars out of five.[21]

Tom Phillips of Metro stated that "Amy and Canton's sojourn to the orphanage was not just a high-mark for sheer skin-crawling horror on recent mainstream telly — that image of The Silence nesting on the ceiling like cadaverous bat-people will live on in the nightmares of many, many children — but also genuinely, properly weird."[22] Dave Golder from SFX thought that although the series was "shaping up to be like no other before it, as the show moves even further away from its traditional series of sequential standalone stories format and more towards Lost style storytelling", that the episode "is no mere exercise in delayed gratification. You want fun? You want creepy? You want action? You've got it – all not-so-neatly tied up with a neat bow tie."[23] Golder went on to state that "once again we're treated to some outstanding direction, glorious performances, near flawless FX and gorgeous locations ... "Day Of The Moon" is huge fun, effortlessly entertaining, beguilingly bat's-arse and blessed with a cliffhanger so jawdroppingly unexpected it's bound to keep viewers hooked". He gave the episode a rating of four out of five stars.[23]

IGN reviewer Matt Risley rated the episode 9 out of 10, saying it "maintained the thrills, chills and scalp-scratching plot twists of "The Impossible Astronaut", whilst somehow tweaking its predecessor's thundering pace into 45 minutes of near-perfectly plotted TV."[24] When comparing it to "The Impossible Astronaut", he said it was "scarier, creepier...and more action packed in every way...[and] also managed to leave things on a suitably epic, mythos-expanding note."[24] He concluded, "the show as a whole has a brand new energy, and we can't wait to see where Who goes from here."[24]

Gavin Fuller of The Daily Telegraph was more critical with the episode, stating, "having set up an interesting cliffhanger last week, it was a tad annoying that Steven Moffat did his trick again of taking a swerve with the pre-credits section of this week's episode, and more supposed shock value with the shootings of Amy and Rory," but also more annoyed "that what exactly was going on here, and how it was influenced by the events of the previous episode, were never exactly explained, leaving the audience to fill in the blanks."[25] Fuller believed that the plot and ending "only raised more questions than answers," believing that the overarching storyline would "require the audience's concentration over many weeks; any casual viewer tuning in this week, and I suspect not a few fans, will have been left baffled by the goings-on," but still felt the episode "was interesting and showed just how, when the writers use their imagination, Doctor Who can tell stories in a way little else on television can."[25]