Ī mysterious stranger goes to Mongul and brings him the severed heads of his other sons, which Mongul congratulates as there will be no more challengers left to confront his throne. When on another adventure and Superman deals with an alien problem with Jon still not ready to be Superman, it is revealed that Mongul is dying and has a secret son. Superman and Jon meet up with aliens whom Superman used to know, and after they deal with the problem, Superman deems Jon worthy of carrying the mantle of Superman. In the present, Superman and his son deal with enemies who enter a portal, where Jon Kent explains that he is not ready to be the next Superman, and soon Superman will disappear where he is killed. In an alternate timeline, Superman is captured by Mongul and is forced to participate in a gladiator match for near eternity until he is killed. The Superman line of books also had been developing several plot threads involving Superman's supporting characters: Action Comics #1029-1036 focuses on Superman learning the truth about Mongul Superman and the Authority focused on Superman trying to assemble a team to confront Warworld and Superman: Son of Kal-El #3 focused on Superman's relationship with his son. The story arc has been teased in Future State: Superman Worlds at War where Superman is captured by Mongul and is forced to be in a gladiator match. The event was received with critical acclaim, with critics praising Philip Kennedy Johnson's writing, the art, and characters. Teased in Future State, the story arc is told in Action Comics and Superman. The series is co-written by Phillip Kennedy Johnson and Grant Morrison with artwork by Sami Basri, Adriana Melo, and Miguel Mendoca. ' Warworld Saga' is a Superman crossover story arc published by DC Comics in March 2021.

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