Zod, Non, and Ursa are being sentenced to the Phantom Zone by the Kryptonian Council. Flashback to an earlier time. Non, Jor-El's former teacher, is reviewing his findings about the planet's internal activities, and agrees that Krypton will explode within 90 days. But the General Zod, head of the Military Defense, interrupts and has them arrested (by Ursa). Non and Jor-El are warned not to discuss the heresy, and released. Jor-El starts working on a rocketship, but Non appeals to the people of Krypton instead, with Zod and Ursa observing. Zod starts to believe what Non is saying. But Non gets abducted, and lobotomized. Zod is outraged, and goes to Jor-El to have him join them in revolt. Jor-El cannot, as the council is needed to take quick action. Zod, Ursa, and Non try to take control anyway, but are defeated. Jor-El is made to be their jailer, and now is forced to exile them to the Phantom Zone.

Plot details indexed by the Grand Comics Database (CC BY-SA).