The latest promo for Syfy's Krypton features a relic from Seg-El's future. In the brief promo, Seg-El approaches Superman's cape, which hangs from a stand that bears the House of El's family crest. However, when he picks it up, it begins to disappear in his hands, starting from the bottom up.
"This cape belongs to your future grandson," a disembodied voice narrates over the promo. "You have to save your world. You have to save your legacy."
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The disappearing cape likely refers to Seg-El's challenge: save his planet or allow it to be destroyed so that Superman is sent to Earth. If he chooses the former, preventing Krypton's death, Superman will never become a hero on Earth. Thus, in a very Back to the Future-inspired move, his cape would no longer exist.
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According to the full series description,
Set two generations before the destruction of Superman’s home planet, KRYPTON follows Seg-El (Cameron Cuffe), the legendary Man of Steel’s grandfather — whose House of El was ostracized and shamed. With Krypton’s leadership in disarray, Seg-El encounters Earthly time-traveler Adam Strange (Shaun Sipos) who warns he’s under the clock to save his beloved world from chaos. Fighting to redeem his family’s honor and protect the ones he loves, Seg is also 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.
Krypton stars Cameron Cuffe, Georgina Campbell, Elliot Cowan, Ann Ogbomo, Rasmus Hardiker, Wallis Day, Aaron Pierre with Ian McElhinney, and it will premiere on Syfy Wednesday, March 21.