I don't own Justice League or Harry Potter just the characters Mass Extinction and Thunderstorm.

Two young heroes were heading home after going for a walk and they found a newspaper and the elder one read the headline The Justice League Has Been Captured at this the younger said, "Not for long let's free them." The elder one said, "Okay let's get suited up and mom did say fight for what we believe in. Sure we haven't been heroes for that long but in all reality what could prepare one for an alien invasion?" When the two heroes got home they told their mother and went to their bedroom and changed into their costumes. The elder who was a tall beautiful young woman with long red hair and olive skin put on an olive spandex outfit with olive boots, gloves, and mask as well as grabbing a bronze double bladed battle axe out of the closet The younger was a slightly shorter but still beautiful olive skinned red-head put on the same outfit only in red as well as grabbing a bronze trident out of the same closet and went out their secret exit. When the two were outside the elder said, "According to the newspaper the prison ship in hovering over Metropolis." At this the younger said, "Let's get going then." So the younger told her sister to save her energy as she carried them both on a gust of wind.

Six members of the Justice League who were betrayed by their seventh member Hawkgirl were helpless in their cells Superman the last son of Krypton was trapped in his cell by red sunlight, in another was Wonder Woman the Amazonian princess was bound to a pole by her own lasso of truth, near her was the Flash the fastest man alive whose cell had strong gravity so he couldn't speed his way out, Martian Manhunter whose cell was by his was bound in metals he couldn't phase out of, and at the end of the hall was Green Lantern the emerald knight who was stripped of his power ring so he was helpless while the dark knight Batman was not seen as a threat and simply shackled to the wall like a criminal a sense of despair and betrayal filled the air.

A crashing sound, what sounded like electricity shocking someone, and someone screaming in pain was heard by Superman and two young women walked into the cell block. The one in olive said, "Looks like we found the Justice League.'' While the one in red stated, "Let's go free them then." As she said that she speared the controls to Superman's cell with her trident while the one in olive sliced the controls to Flash's cell with her axe and then Superman and Flash freed Wonder Woman and Martian Martian Manhunter while the heroines in olive and red freed Batman and Green Lantern. Then Flash said, "Who are you two?" The elder one who is the one in olive said, "I am Mass Extinction." While the younger who is in red said, "I am Thunderstorm."

While they were in a clothing store Thunderstorm said, "Now that's over with let's go." While Mass Extinction said, "Our costumes will give us away though." Then Martian Manhunter while holding a sleeve of a trench coat and shape shifted into a white man wearing a blue trench coat, blue jeans, and black shoes said, "Without our costumes we will just be civilians." Superman said that he was Clark Kent, Wonder Woman was Diana Prince, Green Lantern was John Stewart, Flash was Wally West, Martian Manhunter chose John Jones, and Batman was Bruce Wayne while Mass Extinction was Jesse Jones and Thunderstorm was Tara Jones but Flash asked, "How are you going to hide the axe and trident?" Mass Extinction replied with like this as her axe and her sister's trident turned into rings.

Bruce said, "We'll have to split into four teams of two to make it harder for the Thanagarians to find us. Wally you go with John Stewart; Clark you with J'onn; I'll go with Diana; and Jesse you go with Tara we will meet in the Batcave." Jesse had a question, "It is under Wayne Manor isn't it?" Then Bruce asked, "How do you know that?" Tara answered with, "Our mother has been in Gotham City long enough to know about the Wayne murders and my sister and I found a preserved copy of that newspaper and figured that the Waynes' son would seek revenge." Jesse added' "So we guessed that the your hideout was around Wayne Manor and since you said Batcave we figure it was underground and that the only other heroes that were around at that time were three retired or semi-retired Justice Society members Green Lantern, Wildcat, and the Spectre.

Later, Wally and John arrive at Wayne Manor where they meet Alfred who leads them to the Batcave as everyone else is present. Flash then pointed out the obvious stating cool a giant dinosaur. While Alfred stated, "I thought Batman was the detective." The rest of League reveal to John and Wally they are still trying to figure out why the Thanagarians are really on Earth. Clark points out it's obviously not to protect them, but Wonder Woman is confused, if Earth isn't in any danger than why are they building the force field. Bruce mentions it might not be a force field and John begins wondering what they are really building. Suddenly, much to everyone's surprise, Hawkgirl reveals herself and admits she can tell them the Thanagarians plan.

Everyone is furious and almost get ready to attack her until Hawkgirl says she only came to help. Wally points out that she hasn't been "helping" considering everything that's happened, but Hawkgirl explains that the Thanagarians are really building a hyperspace bypass, which will destroy the entire planet and gives Bruce the data on the project, while also revealing she didn't know of their true plan. Bruce accepts the information, then coldly orders her out. Everyone then turns their backs, leaving only Hawkgirl and John together. She asks John why isn't he leaving, he replies that the last time he let his guard down, she sucker-punched him. Hawkgirl reveals it wasn't personal, but John doesn't believe her. Hawkgirl only admits she did what she thought was right then, just as she feels that warning them was the right thing to do now, and returns his power ring. Hawkgirl then flies out of the Batcave.

Kragger leads a strike team to Wayne Manor to eliminate the League. The Justice League had fully recovered from their captivity and easily brought them down. Martian Manhunter said, "We can get to the hyperspace bypass with this shuttle but I have no idea on how to fly this." Flash asked while pressing a button, "What does this one do?" The button he pushed fired a laser that hit Wayne manor while Batman stated with clenched teeth, "That isn't helping." Martian Manhunter said, "I need one of the hawkmen." Mass Extinction and Thunderstorm dragged in Kragger. When he was asked he simply stated that he'd rather choke on their bones. Flash responded as he was going to punch him to punch him in the face, "How about these first?" Martian Manhunter responded with I'll have to read his mind." Flash asked, "I thought that you can't you couldn't read their minds?" Martian Manhunter said, "I'll have to try harder." However, Kragger's mental defenses, manifesting in the form of hawks, attack Martian Manhunter with such ferocity, his wounds appear on his body in reality. Martian Manhunter stated that he has what they need but did not enjoy what he just did because he ended up leaving Kragger in a catatonic state while Alfred said, "I have to tell Master Bruce not to leave trash in the yard." He was very displeased with Kragger in particular because he knocked him out.

Batman is in command of their strategy: Superman, Wonder Woman, Green Lantern, Mass Extinction, and Thunderstorm to attack the command ship to shut down the force field protecting the hyperspace generator. Batman, Flash, and Martian Manhunter infiltrated the Watchtower using the strike team's shuttle with Martian Manhunter masquerading as Kragger and incapacitate the occupation force. With the Watchtower taken back, Batman explains that he plans to take the Watchtower out of orbit and use it as a missile to destroy the generator. The Leaguers load the unconscious Thanagarians into the escape pods, but Batman sneaks out to launch the pod with Flash and Martian Manhunter still inside, sparing them from his kamikaze mission. Batman himself stays behind, saying that he has to guide the Tower in manually in case it burns on re-entry, even if it means sacrificing himself. Batman bids his comrades farewell.

While Superman, Wonder Woman, Mass Extinction, and Thunderstorm battle the Thanagarian fighters. Mass Extinction said, "How about two of us go down one path while the other two go down the other while Green Lantern breaks into the ship to reach the force field controls." The others agree. Hro Talak is waiting for him, determined not to let Batman succeed in his suicide mission and also desiring revenge on Lantern for his "stolen" love. As Wonder Woman and Thunderstorm fight their way through another part of the ship, they pass Hawkgirl's cell. Though bitter, Wonder Woman releases Hawkgirl, who takes up an Nth metal mace from an unconscious soldier. With the generator complete, the Thanagarians begin the activation to open the hyperspace gate. The Watchtower travels down through the atmosphere, piloted by Batman, having strapped himself into the seat. As the heat increases, the Tower begins to break up. He checks in with Superman on how they're doing with the shield, revealing his current location. On hearing this, Superman breaks off from the battle and flies to intercept him.

In the control room, Lantern fights hard against Talak, but loses after Talak knocks him, and is knocked out. Talak raises his battle axe for the kill, and Hawkgirl appears to do battle with her ex-fiancée, who beats her and renounces his love for her. Lantern regains consciousness, and attacks Talak again, but is very weak from the previous fight. As Talak punches him, Lantern taunts him, and an enraged Talak swings his axe. Lantern dodges away from the force field control he was standing in front of and Talak inadvertently hits the shield surrounding it. In the resulting explosion, Talak is knocked out and the shield drops, allowing Lantern to deactivate the force field with Shayera's help. Superman streaks after the Watchtower as Batman, overcome by the heat and smoke, finally passes out. As the station is low enough inside the atmosphere, Superman breaks in and pulls Batman free just before it hits, destroying the generator. Superman and Batman share a smile. Superman said to Batman, "You always have to be the hero." While Batman responds with,"Right back at you."

At Wayne Manor, Hawkgirl watches a news report with obvious heartache, as her people have ended the occupation and are leaving the planet, thanks to the Justice League. She is waiting while the League debates whether to allow her to remain. Serving her some tea, Alfred tells her that regardless of what the others decide, the fact is her actions saved Earth at great personal sacrifice and he will always consider her a hero for that. Thunderstorm and Mass Extinction agree with Alfred. She gives him a small smile, finding some comfort in that.

Meanwhile in the conference room, Wonder Woman votes against Hawkgirl, reminding everyone that she betrayed them and revealed their weaknesses. However Flash votes to allow her to stay, pointing out Hawkgirl came through in the end, as she has always done, and was stuck with the ultimate no-win situation. Martian Manhunter agrees with Flash to allow her to stay while mentioning they are all Hawkgirl has left. Superman feels for Hawkgirl, but reveals that after everything that's he doesn't know if he could ever completely trust her again. Lantern is quiet while appearing upset. Batman speaks up, pointing out they're arguing in circles, and that it's time they voted. Hawgirl is still waiting nervously until Alfred appears and tells Hawkgirl they want to see her.

In the conference room, Superman is about to announce the League's decision, but Hawkgirl interrupts, deciding to resign from the League. As she goes, Flash stops her momentarily and hugs her warmly. J'onn and Superman say that it's their duty to rebuild the League.

Outside Wayne Manor, John shares a brief, emotional moment with Hawkgirl before she leaves; she's not sure where, just as long as the weight of the world is not on her shoulders, with "no secrets and no lies." On his question of her love, she one last time tells him that she does indeed love him. After she flies away, John tearfully and quietly replies that he loves her too.