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Title: At its best!
Review: This is Dr. Who at its best, in my opinion. The story is strong and intricate; the science is integral to the plot's resolution; the one liners from Baker are witty, instead of just kind of funny, as can occasionally happen; surprisingly quotable truisms from The Doctor about human nature are periodically inserted, without being too didactic; and the energy is high - the story doesn't mire down as it can in some episodes.This probably won't end up as your favorite episode, but it may end up as one of those Dr. Whos that will always get the comment out of you: "Oh, I like that one!"
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