Having just re-watched it, it feels like they are tying together 3 years worth of show. Time war, the Cardiff rift, Rose and the time vortex, Torchwood, Jack's immortality, the Chameleon arches, all brought together in one story.
Writers have been very careful to establish bits of the mythology gradually, before then using them.
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Writers have been very careful to establish bits of the mythology gradually, before then using them.