Chapter Summaries

Leon and Tony crossed into the DC Universe, taking precautions against Kryptonite and preparing for unknown dangers. They arrived in a man-made cave, where Tony fell unconscious from the crossing but remained unharmed.

• Leon wrapped himself in the Dormammu Battle Armor to guard against Kryptonite, while Tony prepared his Mark 16 armor for extreme environments.
• Tony showed Leon that his armor could transform into a Batman-inspired suit and joked about selling it to Batman for Kryptonite.
• Tony admitted he had not properly told Pepper about the trip, then urged Leon to begin the crossing.
• Leon selected a DC world and brought Tony and JARVIS across with him.
• Leon found Tony asleep in a cave, and JARVIS confirmed that Tony was unharmed and identified the cave as man-made.

Leon tried to contact DC’s God but received no response, then found Gold Kryptonite in a cave and tested its effects on himself. As he reached for another piece, he was suddenly transported to a world under a Red Sun and realized he had arrived at the finale of Superman & Lois Season Two.

• Leon attempted to communicate with DC’s God, received no reply, and began surveying the planet with Super Vision and X-Ray Vision.
• Leon discovered Kryptonite in the cave and identified the golden crystals as Gold Kryptonite.
• Leon touched the Gold Kryptonite, sensed it stirring something in his body, and stored a sample in his Inner World for later study.
• Leon reached for more Kryptonite, but the scene changed, the crystals turned green, and JARVIS disappeared.
• Leon escaped through the cave roof and found himself beneath a Red Sun, realizing he had crossed into the finale of Superman & Lois Season Two.

In the Anti-World, Leon discovered that sunlight of any kind strengthened him and that Green Kryptonite triggered a dangerous genetic transformation. After rescuing people from disasters across the planet, he crossed back toward the Positive World and saw Ellie Alston between the two universes.

• Leon realized that the red sun continued to strengthen him, though more slowly than the yellow sun, and concluded that Sun-Bathing Evolution worked under all natural sunlight.
• Leon touched Green Kryptonite and followed the urge to alter his genes, but his body collapsed into blood and he died before reviving through his Blood Sea Clone.
• Leon concluded that Kryptonite might guide his next genetic leap and decided to seek the Life Codex before further experiments.
• Leon gathered the Green Kryptonite and used World Power to rescue people from disasters throughout the Anti-World.
• Leon passed through the spatial gate toward the Positive World, where he saw Ellie Alston between the cosmic bubbles.

Ally began merging the Positive World and the Anti-World after draining Superman’s power, while Leon flew to confront her. In Smallville, Tony found the powerless Clark Kent and learned that Leon had likely been pulled into the Anti-World, leaving Clark to consider risking his life by entering the sun to regain his strength.

• Ally used the energy she had drained from Superman to draw the Positive World and the Anti-World together and planned to fuse everyone with their counterparts.
• Leon isolated himself with the Dormammu Suit and flew toward Ally to stop her.
• Tony woke in a cave, learned Leon had vanished, and sent JARVIS to search for him.
• Tony flew to Kent Farm disguised as Batman and questioned Clark Kent, whose powers Ally had drained.
• Clark explained that people and objects were switching between the merging worlds and said Leon had likely entered the Anti-World.
• Clark considered entering the sun to regain his powers, while Tony suggested finding his own Superman for help.

Tony persuaded Clark to help find Leon in the Anti-World, and Clark led him to a cave passage between worlds. They expected Leon to still be nearby because time passed more slowly in the Anti-World.

• Clark agreed with Tony that they needed another Superman, and Lois urged Clark to act as the world's hope.
• Tony and Clark set out for the cave, but Clark had lost his powers and planned to drive there in a pickup truck.
• Tony lent Clark an Iron Man suit, and the two discovered that Clark mistook Tony for Bruce Wayne and Tony mistook Clark's references to Marvel heroes for familiar comic lore.
• Clark explained that time moved more slowly in the Anti-World and said Leon had been gone for only a few minutes there.
• Tony and Clark flew through the cave toward the spatial gate, expecting to find Leon on the other side.

Tony and Clark crossed the spatial gate to stop Ally from merging the two worlds, but found Leon already fighting her in the Void. Clark feared Ally would drain Leon’s energy, while Tony trusted his brother as Leon struck Ally and sent her flying.

• Clark told Tony how Ally had become a god and planned to merge the worlds, and Tony proposed reversing the pendant’s energy to separate them.
• Clark revealed that he and Morgan had destroyed the pendant, leaving Tony to suggest gathering parameters for a global-scale reverse project.
• With less than twelve hours before the worlds fully merged, Tony and Clark covered their suits in Vibranium and entered the spatial gate.
• In the Void, Clark recognized John’s mechanical suit and warned Tony that Ally could drain Leon’s energy, but Tony urged him to trust Leon.
• Leon appeared in front of Ally at tremendous speed and sent her flying backward.

Leon watched Steel John Henry Irons attack Ally, then killed her with a single punch after she reflected John’s missile attack. Tony arrived with John and Superman, leaving Leon to face the consequences of killing Ally.

• John Henry Irons launched a Kryptonite and red-sunlight missile at Ally, but she absorbed and reflected its energy, sending John flying.
• Leon struck Ally at faster than light speed and destroyed her head before she could absorb his energy.
• Tony contacted Leon and arrived with the injured John and Superman in Mark 16 Armors.
• Leon recognized Superman and wondered whether he had accidentally killed Ally because her body was weaker than Superman’s.

After Ally’s death, Leon discovered that the two universes were still closing in and could collide within hours. He used the energy of a hundred thousand stars to slow them, died from the strain, and regenerated, leaving the group with more time but no solution.

• Leon and Tony discussed ways to stop the worlds from merging, but Ally’s death had separated her Positive and Anti selves and left her unable to fuse the worlds again.
• Leon found that the universes had stopped merging but were still approaching each other and could be destroyed in a collision within hours.
• Leon drew on the energy of a hundred thousand stars and blasted the two world barriers, slowing their approach before the energy reduced him to dust.
• Leon regenerated through the Blood Sea Clone, reappeared before Tony, Wolf Superman, and John, and warned them that the collision was still coming.

Leon warned that although he could stop the universes from moving toward each other, the partially merged Earths would still doom the world. Tony realized Clark might be the only hope and Clark agreed to enter the sun to try to regain his powers.

• Leon explained that he could halt the universes’ collision but could not separate their already merged Earths.
• Clark anxiously asked Leon and Tony for a solution, but neither could offer one at first.
• Tony remembered that Superman might be the focus of the crisis and urged Clark to believe he could save the world.
• Clark realized that entering the sun might restore his powers, and Leon warned that he could die in the attempt.
• Clark asked Leon to send him into the sun, and Tony protested at the last moment.

Leon used his World Ring’s sunlight to help Wolf Superman awaken an immense golden power, and Clark used it to restore Earth and separate the overlapping universes. Before his power faded, Clark boosted Leon’s genetic level to one thousand times.

• Clark prepared to sacrifice himself, but Leon secretly sent him into the light of a hundred thousand stars instead of into the sun.
• Clark’s resolve and the sunlight restored his damaged cells, causing his power to surge until he transformed into a golden Superman.
• Clark revealed that Krypton in his universe had never created the Life Codex, then flew to Earth to stop the crisis.
• Clark restored Earth and resurrected the dead, separated the overlapping Earths, and brought the two Universe Bubbles to a stop.
• After Clark’s golden state faded, he infused Leon with lingering golden power, raising Leon’s genetic level to one thousand times and enhancing his abilities.

Leon reflected on the brief boost and genetic breakthrough he received from Golden Superman, then decided to find a Life Codex before returning to Marvel. After the group returned to Earth, Tony and Leon visited the Kent farm, where they discussed Superman’s responsibilities and joked about Tony’s place in Marvel.

• Leon realized Golden Superman’s brief golden afterglow had raised his genetic level to one thousand times and let him absorb the deductions behind the upgrade.
• Leon decided to search for a Life Codex in the DCEU Universe before returning to Marvel with Tony.
• Tony asked John about his armor, and John and Tony agreed to discuss their armor technology.
• Clark led the group back through the spatial gateway and flew around the world to reassure people that the apocalypse was over.
• At the Kent farm, Lois discussed Clark’s struggle to balance helping people with spending time with his family, while Jordan and Jonathan recognized Tony as a Marvel figure.
• Tony joked about being one of Marvel’s attractions, and Leon teased him by comparing him to a performing bear.

Tony and Leon stayed with the Kents, where Tony discovered that Marvel comics existed in their world and that he was considered a second-tier hero. After dinner, Tony planned to exchange armor ideas with John, while Leon left the farmhouse to absorb sunlight on the moon.

• Jordan and Jonathan excitedly showed Tony Marvel comics about Iron Man, and Leon confirmed that their world was more or less a comic-book world.
• Tony learned that he was a second-tier hero and sometimes a villain in the comics, while Jordan had never heard of Leon.
• Tony and Leon joined the Kents for dinner, where Tony and Clark discussed Marvel stories until Lois reminded them to eat.
• The Kents invited Tony and Leon to stay overnight, and Tony said he would discuss armor technology with John to prepare an Anti-Superman Armor.
• Leon went to the moon to absorb sunlight, while Tony turned off the light and settled into bed at the Kansas farm.

Leon created a third clone based on Legend and collected Kryptonite and Clark's blood for research. Meanwhile, Tony completed his Mark 17 Anti-Superman Armor and showed it off at Kent Farm.

• Leon nurtured Legend's clone in his Inner World, which estimated that its development would take one hundred years.
• Leon returned to Kent Farm, where he joked with Lois and Clark over breakfast.
• Clark took Leon to the Department of Defense and gave him several types of Kryptonite and blood drawn from Clark.
• Tony quickly learned how John's armor worked and spent two days building his own Anti-Superman Armor.
• Tony assembled his gold-and-red Mark 17 at Kent Farm and revealed it to the family.

Tony tested his new Anti-Superman Armor against Clark and Leon, confirming its impressive capabilities while discovering that Leon could still defeat him easily. After completing the armor tests, Tony and Leon left the Kent home to continue searching for the Life Codex.

• Tony asked Clark to test the Anti-Superman Armor, and Clark agreed after confirming it contained no Green Kryptonite.
• Tony's armor struck Clark with enough force to send him flying, but Clark recovered and praised the armor's strength.
• Clark fought Tony for more than ten minutes, then told him the armor had put considerable pressure on him.
• Tony challenged Leon, but Leon quickly subdued him with a joint lock and explained that Clark had been suppressing most of his strength.
• Leon guided Tony through further tests of the armor's capabilities before the two finished their visit with the Kent family and departed to search for the Life Codex.

Leon traveled to the DCEU universe to find the Life Codex, but arrived in 1916, decades before Superman would appear. After rescuing a pilot with Tony, he met Diana on the island of the Amazons, where her curiosity about him quickly turned physical.

• Leon and Tony fell from the sky, and JARVIS accidentally collided with a falling plane while rescuing its unconscious pilot.
• Leon found the pilot clutching a notebook about poison gas and recognized that he had arrived in the world of Wonder Woman.
• Leon realized he had landed in 1916, ninety years before Superman appeared, and met Diana Prince on the island.
• Leon introduced himself as Leon Stark, explained that he came from another world, and told Diana he was looking for Superman.
• Diana touched Leon's chest to admire his muscles, and Leon tried to explain that such intimate contact was unusual outside her island.

Leon was caught by Queen Hippolyta while Diana clung to his hand, but a sudden naval attack forced him to reveal his immense power to save the Amazons. After destroying the battleship and nearly all its shells, he told Hippolyta he had come to help.

• Hippolyta arrived with Amazon warriors and confronted Leon for being close to Diana.
• Leon tried to explain that he had reached Themyscira by accident and wanted to help, while Hippolyta prepared to seize him.
• A concealed battleship appeared offshore and fired shells at the Amazons.
• Antiope knocked Hippolyta from her horse as Leon unleashed crimson beams that destroyed the shells and melted the battleship.
• Leon let one shell explode harmlessly in the forest, then told Hippolyta he had come to help.

Leon told Hippolyta and Diana that a world war was underway and that German soldiers carried plans for poison gas, prompting Diana to conclude that Ares had returned. Hippolyta refused to let Diana leave Themyscira, but Diana stayed with Leon and asked him to take her to find Ares before suspecting that Leon himself might be the god.

• Leon identified the captured pilot as a German soldier and explained that the notebook described poison gas intended for use in the world war.
• Diana blamed Ares for the war and urged Hippolyta to take the Godkiller Sword and stop him, but Hippolyta forbade her from leaving Themyscira.
• Hippolyta thanked Leon for his help, offered him a reward, and left Antiope to assist him while taking the reluctant warriors away.
• Diana shook off Hippolyta and stayed behind, insisting that she wanted to protect humanity.
• Diana asked Leon to take her to find Ares, then wondered whether Leon was Ares himself as Antiope gripped her sword.

Leon convinced Diana that she was a demigod capable of defeating Ares, then opened a portal to Ares’s London office and brought him to Themyscira. Ares faced Diana on the island and urged her to join him in destroying humanity.

• Antiope let Diana leave to confront Ares and promised to persuade Queen Hippolyta.
• Leon told Diana that Ares was posing as a British lord in London and pursuing a poison gas program, and that the Godkiller would not be enough to kill him.
• Leon revealed that Diana was Zeus’s daughter and a demigod, and Diana decided to fight Ares.
• Leon opened a Mystic Arts Portal to Ares’s London office, where Diana confronted Ares and declared her intention to stop him.
• Leon brought Ares through the portal to Themyscira, and Ares called Diana his sister and urged her to help him destroy humanity.

Ares tried to persuade Diana to abandon her faith in humanity, but her attempt to stop him ended with Antiope apparently killed and Diana’s divine power erupting in grief. Leon had secretly saved Antiope and used an illusion to make Diana and Ares believe she had died, intending to strengthen Diana through despair.

• Ares told Diana that he would spare Themyscira for now and leave her time to see humanity’s true nature before they met again.
• Diana and Antiope attacked Ares as he tried to leave, but he threw Diana aside and pierced Antiope with her own sword.
• Diana believed Antiope had died, and her grief and fury unleashed her divine power as she charged Ares again.
• Leon held the real Antiope back at the cliff and explained that he had saved her and created an illusion to provoke Diana’s power.
• Diana managed to exchange a few blows with Ares while Leon planned to use the approaching Amazon forces as further training for her.

Diana watched Ares kill Hippolyta and destroy the Amazon army, then unleashed her divine power and defeated him, destroying Themyscira in the process. Leon appeared afterward and revealed that he had saved Diana’s family and restored the island, leaving her reunited with her loved ones.

• Queen Hippolyta arrived with the Amazon army, but Ares turned their arrows back on them and seized her.
• Ares killed Hippolyta and buried the Amazon warriors, leaving Diana devastated and enraged.
• Diana absorbed Ares’s lightning, withstood his attacks, and unleashed divine power that killed him and destroyed Themyscira.
• Leon appeared beside Diana and told her he had saved her family and restored Themyscira.
• Diana saw Hippolyta, Antiope, and the other Amazons alive and broke down in relief.