Set two generations before the destruction of Superman's home planet, Krypton follows Seg-El, 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 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.
On the planet Krypton, Val-El is executed for high treason. Fourteen years later his grandson Seg discovers that Val was trying to identify a threat that plans to destroy Krypton and countless other worlds... and wipe out Seg's grandson-to-be, Kal-El, who will one day become known as Superman.
Seg gives Adam two hours to provide proof of his claim that Brainiac is coming. Meanwhile, Daron prepares to initiate Seg into the House of Vex, and Lyta challenges her commander to a duel to the death.
Lyta tries to use her new influence as a Sagitari commander to keep the troops from wiping out the Rankless searching for Black Zero. Meanwhile, Seg and Adam try to find Brainiac's Sentry and prevent it from sending information to its master giving way Krypton's viability for conquest.
To avoid punishment for the failure of the Rankless Initiative, Daron offers Lyta as a scapegoat. Meanwhile, Seg meets the Commander, and Ona is promoted.
Seg tries to survive his escape from the Commander and his people, running low on heat and oxygen. Meanwhile, Lyta gets a stay of execution but dishonors Jayna in the process.
The Commander's identity is revealed, and Seg must decide whether he chooses a new future or not. Meanwhile, Naron and Jayna's plan to assassinate the Voice runs into a snag.
Daron pledges his loyalty to Brainiac, and his first order is to kill Nyssa. Meanwhile, Adam questions whether he's a hero, and Jayna meets her grandson.
Seg and his group make plans to eliminate the Voice, and Jayna learns that Zod's motives may be less than pure.
After Zod fails to obtain Doomsday, Seg united the warring factions in Kandor for a final assault on Brainiac.
Brainiac prepares to take Kandor, and Zod helps Seg bring back the one man who can stop the Coluan. Meanwhile, Nyssa learns the truth about her origins, and Lya leads the Sagitari in a last stand against Brainiac.
Zod tightens his grip on Krypton with Lyta's help. Adam returns to Krypton and is then forced to teleport away to where Seg and Brainiac have escaped from the Phantom Zone.
Seg discovers that Brainiac lives on... in him. Lobo vows to kill Brainiac, and Seg and Adam escape him. On Krypton, Nyssa gives valuable intel to the Resistance, while Lyta meets someone who reminds her of Seg.
Complete episode guide for Krypton with detailed information about every season and episode including air dates, summaries, ratings, and streaming availability in United States.
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Seg and Adam try to remove Brainiac from Seg's consciousness, but Lobo has other plans. Nyssa meets an old lover, and Lyta tells Zod to let her prove she's the woman that he knew as his mother.
Seg reuniteds with Lyta and tries to persuade Zod to turn from his path of conquest. Adam and Kem open up the way for the Rebels to take the Space Elevator Base, while Jax plans mass murder.
Lyta goes to Wegthor to negotiate an end to hostilities, but Jax ignores Val and takes her prisoner. Seg confronts Zod, and Brainiac has some advice for Superman's grandfather.
Everyone on Krypton deals with the shock of Jax killing Lyta: Zod prepares a new stratagem, Val challenges Jax for leadership of the Rebels, and Seg contemplates an unholy alliance while rescuing his son.
Doomsday's origin is revealed as Zod and Lis-Ser probe the creature's memories. Brainiac forces Seg to take him to the Fortress, but Seg comes up with a way to remove Brainiac's presence from his brain.
Lyta's fate is revealed, and Zod finds a way to bend Doomsday to his will.
Zod brings Doomsday to heel and unleashes him on the Rebels, and Seg, Val, and Kem fight a last-ditch battle to hold the creature back while their compatriots escape.
Seg and Lyta face off against their son while Zod's forces attack New Lurvan. Nyssa borrows Adam's teleporter to travel to Rann, and Lobo pays Seg an unexpected visit.