In this episode of Trekking Through Time and Space...

Hoai-Tran and Jacob kick off season 6 of Star Trek: The Next Generation with the conclusion of "Time's Arrow." Over on Doctor Who, "The Zygon Invasion" asks tough questions with some very tough imagery.

• Star Trek: The Next Generation: Time's Arrow (Part 2) - 1:06

• Doctor Who: The Zygon Invasion - 41:09

• Episode Rankings - 1:20:42

Logo by David Scaliatine.

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