Superman decides to release Mala, a Kryptonian criminal, from the Phantom Zone, but when Mala proves too power-hungry for this world, Superman tries to send her back. Mala escapes with the Phantom Zone Projector and releases Krypton's most notorious traitor, Jax-Ur.

Superman and Professor Hamilton start building a new Phantom Zone projector to balance the odds. However Jax-Ur and Mala manage to send Superman into the Phantom Zone, and then destroy the Projector. As their decimating attacks begin, it's up to Lois and Professor Hamilton to rescue the Man of Steel in time.

Superman stumbles across a world ruled by Phantom Zone criminals and tyrants Jax-Ur and Mala.