I don't own Justice League or Harry Potter just my OCs

Question has been captured by Cadmus and Captain Atom was recruited by General Eiling so Superman and Mass Extinction along with Huntress rescued Question and retrieved Captain Atom.

Professor Hamilton installs a transmitter on Galatea's forehead putting her in telepathic contact with the Ultimen. He explains that, unlike the previous versions, these Ultimen clones are just "blank slates", entirely dependent on Galatea's commands. Waller appears, telling Galatea it is time. As she prepares to leave on her mission, Galatea stops, turns back, and gives Hamilton a goodbye hug, calling him "Daddy". With that comment, Hamilton's face falls.

Aboard the Watchtower, the crew are still working flat-out to restore main power as quickly as possible. The first thing they get back is communications, which allows them to speak with Flash reporting from the surface that, mercifully, there are no fatalities. However, Flash also conveys that the public no longer trusts the League, blaming them for what happened.

Seeing a news report of the devastation, Superman calls a meeting of the founders, sans Flash and Batman since they're both planetside. Superman says they've lost the trust of the people, and Wonder Woman proposes making a gesture of cooperation. The founders announce to the rest of the League that they are temporarily giving themselves up for arrest until their innocence is proved.

When called, Flash agrees to come too, but Batman vehemently refuses, despite Wonder Woman's pleas, preferring instead to track down those responsible for framing them. Six of the seven founders surrender themselves to the authorities.

Aboard the Watchtower, STRIPE. detected a volley of incoming Damocles-class missiles, which deploy driller heads instead of explosive payloads. The missiles strike, boring into the hull and disgorging the Ultimen. Galatea follows, issuing two simple orders: Clear her a path to the station's reactor room, and then kill everyone in the Watchtower. Dr. Fate teleported the injured out and revealed that these Ultimen were just organic robots.

Inside Cadmus, Amanda Waller and General Eiling are watching the progress of the attack, when Batman appears, knocks out Eiling easily, and confronts Waller. He tells her that, moral considerations outside, the League wouldn't have fired the cannon even though Mass Extinction and Thunderstorm don't trust the government especially about superheroes because they forced the Justice Society to retire, forcing the All Star Squadron to retire, and what had happened to the Super Friends: They've been keeping tabs on Cadmus for months, and would have known that the facility was empty when it was hit. The cannon was fired remotely, and out of the people capable of doing so, the only one not already on the Watchtower was Lex Luthor. Batman suggests that Waller "start looking at him, hard", then leaves.

A full-scale battle rages inside the Watchtower. Even the human support staff, though told to stay sheltered, join in the fighting. As a group of Ultimen reach the infirmary, Huntress and Question join the fray, as does Captain Atom, still injured, from his sick bed, having decided whose side he is on.

Steel notices a danger signal from the reactor room and flies down to join Atom. As the League takes the upper hand, Supergirl breaks off and runs down to check. She finds Atom knocked unconscious, and sees Galatea wiping the floor with Steel. Galatea informs Supergirl that she is about to sabotage the reactor and blow up the Watchtower. They fight, but Supergirl is outmatched. Galatea is stronger and more aggressive than she is. As they fight, Supergirl goads her with the fact that she is not a real person, and Galatea becomes even more violent.

Back at Cadmus, Waller has started "looking" at Luthor, and it has taken her an embarrassingly short time to discover that Batman was right: Luthor has been poaching copies of advanced Cadmus technology and shipping it to his laboratory at LexCorp. Hamilton makes a quick examination of the technology and confirms that it could have been used to remotely fire the Watchtower's cannon, but there's something else. In horror, Hamilton realizes what Luthor's true plan is.

Waller calls Galatea and orders her to cease the attack. Galatea, blind with rage and her desire to kill Supergirl, ignores the order. As she burns Supergirl with her heat vision, Steel awakens in time to fire a blast that drives her back. Reaching the end of the restart process, the power is restored. As Supergirl is weakened by Galatea Thunderstorm and Mass Extinction went up and battled the clone Thunderstorm kept her still with her lightning with Mass Extinction pummeled her as a Gigantopithecus but the sisters ended up nearly killing Galatea which ended up nearly killing the Ultimen clones.

Up on the bridge, the League cheers as the last of the Ultimen are defeated, but the power goes off as soon as it came back on. Supergirl helps Steel to his feet, while Galatea is left on the floor pretty much dead.

In his laboratory, Luthor has finished his great project: An android body based on the design of Amazo albeit with his own likeness. He intends to transfer his consciousness into the android, but Batman confronts him before he can begin. He has finally solved the puzzle: When Luthor worked with the Atom to stop Amazo, he saw the android's blueprints and memorized them. Batman realizes that the Cadmus crisis is all a cover for Luthor's true goal: Giving himself superpowers. Luthor confirms this, but adds that he'll also gain his revenge on Superman. The world has turned against the Justice League, so him killing the Man of Steel will be seen as a heroic act.

Batman attempts to destroy the android, but Luthor intercepts and crushes the explosive Batarang. They briefly fight, but Luthor quickly subdues Batman and throws him out of the window with his mysterious super-strength. Before he can hit the ground, however, Batman is rescued.

Meanwhile, Luthor has hooked up his equipment and is ready to begin the consciousness transfer. Just before he throws the transfer switch, Waller appears with a nano-disassembler cannon (Luthor's own design) and disintegrates the android. Luthor rages that Waller has ruined weeks of hard work, but the she declares him to be under arrest for framing the League and attempting to kill everyone at Cadmus. Backing Waller up, the seven founders of the Justice League have entered the room.

Superman tells Luthor that it's over. Outnumbered and out of options, Luthor still refuses to give up... but suddenly interrupts himself with a scream of pain. He falls to the floor, his body mutating into a tentacled, top-heavy monstrosity with a familiar three-dot triangle on his chest. As a skeletal metal face emerges from his abdomen, Luthor's voice becomes mingled with, then rapidly subsumed by, a robotic monotone... Brainiac.

Inside LexCorp, the Justice League's seven founding members and Amanda Waller have just been treated to the bizarre sight of Brainiac inside Lex Luthor's body. But no one is more surprised than Luthor himself. Brainiac explains that he inserted a microscopic copy of himself into Luthor's body when he forced Luthor to build him a new body inside LexCorp years then, he has grown steadily, until Luthor was, for all intents and purposes, acting under his control. As a by-product of his occupancy, Brainiac cured Luthor's Kryptonite poisoning and gave him his mysterious super-strength. The last act Luthor was to accomplish was to transfer Brainiac's consciousness into the "more suitable" android body.

Having had enough exposition, the League attacks, but the Luthor/Brainiac hybrid knocks the League and Waller out of the building. Superman fights the hybrid, but it is able to convert the building into mechanical constructs, with which he eventually overpowers the League, planning to digitize any individual knowledge they have, then delete their physical forms. But Martian Manhunter phases free of the restraints and smashes Brainiac's body, freeing the League. As his final move, Brainiac converts the entire top of the LexCorp tower into an enormous skull-like robot ship, and attacks again. The Justice Leaguers swarm an attack the ship at all sides before the combined power of Superman and Green Lantern destroy the ship.

It seems the threat is over, but Batman immediately claims the fight was too easy, and the League realizes the attack was only a diversion and Luthor/Brainiac is nowhere to be found. Under Brainiac's control, Luthor is walking along a sewer several miles away, looking to find a place where he can stop and repair himself. Brainiac makes it clear that he regards Luthor as only a temporary vessel, and will then be destroyed. Luthor points out that Brainiac's programming is devoid of purpose: Its ultimate end is simply for him to digitize, then destroy the entire universe. With nothing afterwards, Brainiac will have fulfilled his purpose and cease to function. Luthor says he can show Brainiac a higher purpose by providing him a trait he lacks: Imagination.

In conference with Waller, the League deduces that since Brainiac's body is entirely nano-technological now, thus, he will go to Cadmus to harness the power of the Dark Heart. They call for backup but Mass Extinction and Thunderstorm told Batman that the teleporter and all of the Javelins were destroyed in the battle and the members that can travel in space unaided which are Starman, Captain Atom, Doctor Light, and Orion are too injured to help STRIPE so don't expect any help. Batman concludes that the seven founding members are all that are left.

Sure enough, as soon as they arrive, Brainiac and Luthor have done just what they feared and absorbed the Dark Heart's nanotechnology. Newly empowered, a new entity is created: a true fusion of Luthor and Brainiac, which has created a machine that will enable "them" to instantly absorb and destroy all the knowledge stored on Earth then the universe, except they will now be able to re-make the universe to their liking.

To fight the League, Luthor/Brainiac conjures up android replicas of the Justice Lords, each of which battles its counterpart and goads him/her with their worst fears and insecurities: Superman's fear in normal humans that his power inspires; Green Lantern's heartbreak; Shayera Hol's status as an outcast on both Thanagar and Earth; Flash's immaturity compared with the rest of the League. They are all resistant to the goading, and defeat their doppelgangers. The League then successfully destroys the machine, but Luthor/Brainiac is still too powerful for them. All of them are knocked unconscious by energy beams but Flash dodges the attack though it does knock him off-balance. Luthor/Brainiac creates guards out of nano-tech and prepares to kill Flash in a manner similar to President Luthor's dark deed, but Flash vibrates free of his restraints, and is left standing alone against Luthor/Brainiac.

Luthor/Brainiac taunts him, and Flash hesitates, then streaks away. Luthor/Brainiac begins reassembling his machine – and then Flash hurtles at him from the opposite direction, having run so fast that he's circled the globe in only a few seconds, and hitting Luthor/Brainiac with enough force to tear away a chunk of "their" android armor. Flash makes his fastest run ever, circling the world faster and faster each time, hitting the fused villain harder and harder each time. Then Flash stops, his body crackling with the speed energy he's tapped into, and applies his vibrating hands to Luthor's Brainiac armor, tearing it completely away, and leaving Luthor naked and helpless at the bottom of a crater.

As the League regains consciousness, Flash stands, unsteady, and then fades completely away, to the horror of his teammates. Luthor weakly gloats that he had indeed killed Flash. But now is the moment of truth for an enraged, grieving Superman: He seizes Luthor, and his eyes glow red. Wonder Woman moves to intervene, but Batman stops her as this is Superman's decision. Superman's eyes return to normal and he releases his grip on Luthor. At the end of the day, Superman is not a Justice Lord – No matter how much he wishes he could do what that one did at this moment.

Then J'onn shouts that Flash is still alive, and he can sense Flash telepathically. Shayera reaches in the direction J'onn is pointing, and her hand touches a portal to some other dimension, the "Speed Force", into which Flash has been taken. From within, Flash is enraptured with the realm, which is "calling him home" and wants to give in to it. Alarmed, Shayera shouts for him to resist it and seizes his hand, with all six Leaguers form a chain with Batman as the anchor, and it takes all their combined strength and will to pull Flash back into reality. Flash mentions if he ever goes that fast again, he won't be able to come back. A short distance away, a relieved Waller tells the President to call off the air strike against Brainiac.

The next day, Superman addresses a crowd in Metropolis, including the members of the expanded League, the Watchtower support crew, the press, and various citizens. He says the League has been guilty of arrogance, and has alienated the people it was trying to protect. That being the case, the founders have decided to disband the League, and decommission the Watchtower: "This is the end".

In the silence that follows, the founders begin to dismount the stage – and Green Arrow steps forward and delivers his own compelling speech to Superman, telling him that no matter what, especially after their victory against Luthor and Brainiac, they are still heroes and needed greatly, particularly Superman.

This speech is greeted with applause from the crowd. Superman turns to Batman, who smiles and gives the Man of Steel an encouraging nod. It is a turning point for Superman: After so many years, he feels he has finally regained the trust he lost when he attacked the Earth while under Darkseid's control. Happily bowing to the crowd's pressure, Superman agrees that the League will stay in service, but they will have to make changes to ensure they remain in touch with the people, and suggests they could start by opening an embassy on Earth.

As Superman goes on, Batman excuses himself and throws a verbal wink to Green Arrow, who has justified Batman's reasons for recruiting him in the first place.

That evening at the Daily Planet, Clark Kent drops in on Lois Lane as she is finishing her story on the League. He is surprised to hear that she's using the adjective "ambivalent", and she shoots back that her job is to be as tough on Superman as she is on any subject, but only because he himself has set such high standards. After all, she finishes, "he's only human... You know what I mean." Smiling, Clark says he does, looking out the window to the deepening night.