John Hughes

'Doctor Who' prepares for a goodbye, and hello to an uneven 'Class'

'Doctor Who' prepares for a goodbye, and hello to an uneven 'Class'

"Doctor Who" returns to Earth Saturday night on BBC America, after a year away (except for December's traditional Christmas episode). For those unfamiliar with this incomparably long-running sci-fi series-cum-British institution about an alien traveler in time and space, change is baked into its DNA: The Doctor periodically regenerates into a new version of himself, differently played by a different actor, but more or less the same person. (It's quite quantum.)

But there is a changing rotation too of sidekicks – "companions" – who complement or contrast and in different ways complete the Doctor's character. This practice is mirrored on the production level by the...

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