Serien utspiller seg på den fiktive planeten Krypton rundt 200 år før Kal-El/Superman blir født, og før planeten blir ødelagt. Handlingen foregår rundt bestefaren til Kal-El, Seg-El, når han kjemper for rettferdighet på sin hjemmeplaneten sin.
Pilot
S01E01 42 minutter
Superman's grandfather, Seg-El, learns Krypton is in danger of being destroyed so that his future grandson will never be born.
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House of El
S01E02 42 minutter
After suffering a tragedy, Seg must adjust to a new life, a new rank and a new threat.
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The Rankless Initiative
S01E03 42 minutter
During a military crackdown on Seg's home district, Seg and Adam Strange race to find a deadly Sentry.
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The Word of Rao
S01E04 42 minutter
Seg is approached by a Black Zero leader as Rao finds a scapegoat for the failed Rankless Initiative.
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House of Zod
S01E05 42 minutter
Jayna grapples with her torn loyalties as Seg fights for survival within the heart of Black Zero.
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Civil Wars
S01E06 42 minutter
Seg is faced with an impossible choice that will shape the El legacy and the fate of the universe.
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Transformation
S01E07 42 minutter
After a failed coup, Daron punishes the conspirators. Lyta and Dev go in search of Jayna.
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Savage Night
S01E08 42 minutter
A resistance movement begins to form to impede the Voice of Rao's increasing power and influence.
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Hope
S01E09 42 minutter
Seg must decide if he can make the ultimate sacrifice in service of the greater good of Kandor.
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The Phantom Zone
S01E10 42 minutter
Seg races to save his city from being overtaken as the bottling of Kandor begins.
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