“Doctor Who” returns after a lengthy summer hiatus and toys with revisionist history. In “Let’s Kill Hitler,” the Doctor and his team meet Hitler face-to-face and confront whether they should revise history a bit in the Season 6 2.0 series opener. Nazis and science fiction are sure to make an interesting story. Of course, that’s just garnish. The meat and potatoes, the story of River Song’s relationship with the Doctor, is where the real action lies. “Doctor Who returns Saturday at 9 p.m. on BBC America.” Here are previews of what’s to come:
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