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.

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.

Lyta's fate is revealed, and Zod finds a way to bend Doomsday to his will.

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.

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.

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.

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.

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 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.

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.