Three Kryptonian criminals, led by General Zod, were banished to the Phantom Zone before Krypton's destruction. Years later, they were freed when a nuclear warhead exploded in space, giving them almost unlimited power. They used this power to take over Earth, while Superman, who had previously renounced his powers to be with Lois Lane, must regain them to save humanity.
Superman II: The Richard Donner Cut
As Superman begins a romance with Lois Lane, he makes the ultimate sacrifice by giving up his powers, unaware that three Kryptonian villains he inadvertently freed are now threatening to take over the planet.
