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What if Superman never existed? Set two generations before the destruction of Superman's home planet, Krypton follows a young Seg-El, the legendary Man of Steel's grandfather, who is faced with a life and death conflict – save his home planet or let it be destroyed in order to restore the fate of his future grandson. With Krypton's leadership in disarray and the House of El ostracized, Seg fights alongside Earthly time-traveler Adam Strange to redeem his family's honor and protect the ones he loves while saving the future of his legacy from DC Super-Villain Brainiac.