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The idea of parallel Universes has been around for over 60 years now, giving a theoretically physical existence to all the possible outcomes of our reality, including the ones that didn't occur. In our current reality, once a quantum decision is made, or an observation constrains the possible remaining outcomes, these other Universes must split off irrevocably from the one we inhabit. In Star Trek: Discovery, however, there remains a connection between the Universe where the original crew is from, and the mirror Universe, which split off from the original timeline some 200 years ago. As we learn more about the two different Universes, we find commonalities: people, relationships, even wars and betrayals. After an incredible plot twist, we finally discover why, but the question of how to make this possible lingers. Recap: Interphasic space. That's the explanation, right away, given for how the two Universes are still in contact with one another: a "hidden" region of space where a potentially traversible connection still exists. Burnham reveals these facts which Saru has decrypted from the U.S.S. Defiant, which was the only other ship to cross from the prime to the mirror Universe. Burnham delivers Lorca to the Emperor, who refuses to bow until Emperor Georgiou forces him to. Burnham is praised and celebrates as Georgiou's long-lost daughter, and is told to choose a Kelpian. When she picks mirror Saru, she's horrified to learn that he's the main course for dinner, and is forced to eat his threat ganglia, much to her horror. Her discomfort betrays her, and Georgiou, sensing something is wrong, makes accusations and sentences Burnham to death. But things go even deeper from there. Burnham, to save her life, confesses her true origins: that she and Lorca are from another Universe. Captain Georgiou's badge, with its quantum-variant signature, is the proof. When she tells Georgiou about the spore hub drive, Georgiou becomes intrigued. Traversing Universes via interphasic space causes insanity, but clearly the spore drive doesn't, and Georgiou wants the technology. Lorca, meanwhile, is being tortured in an agonizer, and one of Georgiou's top lieutenants wants revenge for what mirror Lorca did to his sister. After torture, murder, and eventually Lorca turning the tables on the torturer, we get the big reveal that Georgiou has already figured out: our Captain Lorca has been the mirror Universe version all along. He is here for... revenge? Redemption? Murder? The serialized nature of Star Trek: Discovery finally pays off.