The episode demands attention from its opening sequence. A man places an emergency call, frantically babbling about “they” being “everywhere” only to disappear mid-sentence and reappear as a smeared painting on the wall behind where he was standing. The way the camera moves and tilts to reveal his face is like one of those street paintings that only comes into focus when you see it from a certain angle. Sure enough, “Flatline” centers on an alien invasion from a two-dimensional universe, and in ours their deadly handiwork ends up looking like street art – a bizarrely weird idea worthy of Moffat himself, but dreamed up by Jamie Mathieson, who also penned last week’s outing.
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