Justice League: Crisis on Two Earths

The Jester sacrificed himself to ensure Lex Luthor could escape with the Quantum Trigger. When the alarm was triggered during their heist at the Crime Syndicate headquarters, the Jester detonated a bomb that killed himself, J'edd J'arkus, and Angelique (who had just stabbed him with her flaming sword), creating a distraction that allowed Luthor to activate his dimensional travel device and flee.

Earlier in the heist, the Jester and Luthor had already secured the Quantum Trigger, making their escape the primary objective.

Luthor turned himself in because he knew he would be mistaken for the evil version of Lex Luthor from the Justice League's Earth. He deliberately used this misunderstanding to get arrested and gain access to the Justice League, where he could explain the crisis happening on his alternate Earth and request their help against the Crime Syndicate.

Luthor intentionally used his dimensional travel device to arrive on the Justice League's Earth, knowing the inhabitants would view him with suspicion.

President Wilson released Ultraman because he believed cooperating with the Crime Syndicate was necessary to save millions of lives. His world was under constant threat of nuclear retaliation from the Syndicate, and he made the difficult political decision to appease them rather than risk catastrophic destruction. This decision was driven by his military background and deep value for protecting human life, though it made him appear cowardly to his daughter Rose.

Earlier, Luthor explained that nuclear retaliation was the only thing preventing the Syndicate's total domination.

Owlman believes that destroying Earth-Prime, the original universe from which all parallel worlds branched, would erase all alternate realities, including his own. He views this as the only truly meaningful action in a multiverse where infinite versions of everything exist. His nihilistic philosophy holds that nothing matters in an infinite multiverse, so destroying the source of all existence would be the one act with genuine significance.

When questioned by Wonder Woman about the Q.E.D.'s destructive power, Owlman explicitly stated it could obliterate entire universes and that he believed such destruction was necessary.

Johnny Quick used his super-speed ability to match the vibrational frequency of his molecules with Earth-Prime's temporal vibration. By synchronizing his molecular vibration with the universe's temporal vibration, he was able to phase through dimensional barriers and open a portal to Earth-Prime. However, this technique caused him to age rapidly due to the strain of the vibrational mechanics involved.

Batman had anticipated the vibrational effects and warned that the plan would have consequences, which proved true as Quick aged dramatically after crossing over.

Owlman chose not to disarm the bomb and died in the Q.E.D.'s explosion because of his nihilistic philosophy. After Batman outwitted him and sent him to an uninhabited Earth with the weapon, Owlman activated the device anyway, declaring 'It doesn't matter.' He saw death as meaningless in a multiverse where nothing truly matters, and choosing to die rather than disarm the bomb was consistent with his belief that only destruction holds significance.

Owlman's earlier dialogue established his belief that nothing matters in an infinite multiverse, making his choice to die rather than surrender logically consistent with his character.

Batman chose to stay behind because he argued the Justice League was already stretched too thin to handle problems in both worlds. He stayed to complete the construction of the Watchtower, which would serve as a base of operations and help coordinate efforts between dimensions. His decision proved strategic, as it allowed him to deduce which universe was Earth-Prime and formulate the plan to stop Owlman.

Batman's initial reluctance to help Luthor, citing resource constraints, foreshadowed his later pivotal role in solving the Earth-Prime mystery.

J'onn J'onzz inadvertently read Rose Wilson's mind while she was hiding her fears about her father's decisions during an assassination attempt. As a Martian with telepathic abilities, he picked up on her emotional state and later used this connection to reassure her about her father's motivations. This incident sparked a romance between them, with J'onn explaining that Wilson's military background made him value life deeply, which explained his seemingly cowardly choices.

Rose had publicly viewed her father as a coward for cooperating with the Syndicate, and J'onn's telepathic ability allowed him to understand both her fears and her father's true motivations.

The Justice League captured Ultraman during a daring rescue mission on Lex's Earth. After arriving in the alternate universe, they undertook a major operation against Syndicate targets, successfully ambushing and overpowering Ultraman, the evil counterpart of Superman. This capture was a significant victory that temporarily weakened the Syndicate's leadership.

The League had regrouped at Jester's base to formulate plans for attacking Syndicate targets after their initial confrontation forced a retreat.

Wonder Woman kept the cloaked plane she took from Owlman's universe as a memento of the battle and the threats they faced. The plane served as a reminder of the sacrifice of heroes like the Jester and the challenges of the multiversal conflict. It also represented her connection to the alternate Earth and the personal stakes involved in saving both worlds.

The plane was part of the equipment from Owlman's base, which the League utilized during their operations in the alternate universe.

Superman used his x-ray vision to examine Lex Luthor and discovered that his organs were reversed, a biological impossibility on their Earth but normal in the alternate universe. This physical proof confirmed Luthor's claim that he came from a parallel Earth and was not the evil Luthor of their world, which was still imprisoned.

Superman's x-ray vision had already been established as a power earlier in the story.

The Crime Syndicate maintained control of Lex's Earth through the constant threat of nuclear retaliation. While they had eliminated the Justice League counterparts and taken over the planet, the looming possibility of nuclear destruction kept the population in check and prevented full-scale rebellion. This nuclear deterrent was the only thing preventing total domination and resistance movements.

Luthor explained to the Justice League that nuclear retaliation was the only barrier to the Syndicate's complete control.