The classic "Star Trek" episode "Mirror, Mirror" is one of the series' most high concept stories, and thus one of its most remembered: Captain Kirk (William Shatner) and co. wind up in a parallel universe where Starfleet serves a Terran Empire, not a United Federation of Planets. This "Mirror Universe" has endured as one of most reused settings in "Star Trek."

When "Star Trek: Deep Space Nine" revisited the Mirror Universe, it followed the formula of "Mirror, Mirror" each time: the main characters get transported to the Mirror Universe and meet evil doppelgangers of themselves and their friends. The prequel series "Star Trek: Enterprise" did something different with its Mirror Universe two-parter, "In A Mirror, Darkly" (written by Mike Sussman and Manny Coto) which was set completely in

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