Critic Consensus: "Extremis" expertly juggles several of Doctor Who's more thought-provoking themes, enlivened by a sharp-witted script and a fast-paced plot.
Critic reviews for Extremis
"Extremis" [is] a marvelous piece of narrative legerdemain that manages to slip from religion to sci-fi to existentialism and back again, all interspersed with a separate framing tale about morality and fear and friendship.
There was typical Moffat wit and verve to the dialogue, which kept what could have been an overly complex episode fizzing along nicely.
The problem with Extremis isn't in the watching of the episode though. The problem with Extremis is afterwards, when you stop and think about the episode.
"Extremis" also works nicely as a prologue to the real showdown with the Monks, giving us an idea about what the world is up against, without actually telling us any of their plans.
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