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I agree with B.J.. When Voyager re-did the time-loop concept (and for that matter, ANYTHING that TNG did), it was horrible. SG-1 and Atlantis are re-visiting old themes, but with new twists on the concept AND strong enough writing that it's still enjoyable enough to watch. And as mentioned, when they re-visit something, they're usually smart enough to SAY so, build on it, and as demonstrated here have some fun with it in the process.