Okay, so this is the first fanfic I have ever written, so it will probably be trash, and I apologize in advance. I'm also not much of a writer, so don't expect something majestic or great.

I got the idea for this while reading AngelDesaray's "Across the Universe" series. It's a really cool Star Wars series that I highly recommend. I was extremely disappointed when the author abandoned the project, and it inspired me to try my hand at writing my own.

Mandatory disclaimer: I don't own The Flash, Arrow, or Supergirl, or any Arrowverse characters for that matter. I also don't own any songs mentioned and/or used in this fic.

That's enough out of me lol. Enjoy!

Christian lay on the edge of his bed, blasting his playlist of random, obscure music through his headphones. With all the cares of the world blocked out by Pentatonix and Tobu, he focused on the task in front of him. Christian had been working on writing a script for the musical episode Duet from the TV series The Flash. However, as he typed away, he found it increasingly hard to concentrate.

"'Barry looks around in wonder as he comes to, his surroundings reminding him of his favorite musical Singin' in the Rain. He hears singing, and focuses on the center of the room, where he finds his friend Kara performing a rendition of Moon River.

'...Two drifters, off to see the world

There's such a lot of world to see

We're after the same rainbow's end, waitin' 'round the bend

My huckleberry friend, moon river and me…'

Barry smiles at Kara as she sings, only for her to recognize him with a start. She finishes her song…'

No, I can phrase that better, can't I?" Christian complained. He sighed as he leaned back into his chair. He really wanted to pull this off so that his teacher's musical theatre group could perform it, but he truly had bitten off more than he could chew. He found out quite quickly how hard it is to include superpowers and months of romance and angst that was condensed into 45 minutes into a script for a musical without sounding totally idiotic or cheesy.

Christian sighed again, looking around his room for inspiration. Nothing came to him, though. Nothing had come to him ever since he saw the first three episodes of Crisis on Infinite Earths. The crossover had left him despondent and confused, and grieving the loss of his favorite characters, even though they were only fiction. Oliver dying at the end of Hour 1, everyone except the 7 paragons dying at the end of hour 3, Lex being an annoying piece of crap, and other things struck him in a way he didn't know was possible.

Christian was a bit of an Arrowverse fanatic. He was a die-hard fan, but he never read any comics or formed any theories or interacted with the community surrounding it. However, he was a big fan of the shows that started it all. He knew each and every character and storyline by heart. So seeing so many of his favorites just vanish was a bit heartbreaking. He'd dealt with heartbreak before, though, so he figured he could deal with it again.

Christian sighed for yet another time, glancing at the clock. His eyes widened in surprise as the clock read 1:40 AM. "Welp, time for bed, I suppose.," he muttered to himself as he got to his feet, untied his shoulder-length hair, changed into a light tank top, went to sleep.

*EARTH ONE*

The Flash, Barry Allen, speeds in front of Agent Smith, cornering him in front of his car. "We're trying to help you, and this is how you thank us?" he accuses confrontationally.

"You don't understand," Smith replies. "The reason the Xenomorphs are here-"

"Is because they have a beef with the metahumans. Tell us something we don't know." Sara Lance, the White Canary interjects.

"Like, what exactly have we done to them?" Barry asks.

"Nothing, yet," the man replies. "But they see individuals with powers such as yours as a future threat, and frankly so do I." Smith points accusingly at Barry. "You brought them here when you created Flashpoint, when you went back in time to change your fate. You did that, Mr. Allen." Smith turns to Oliver, who stood slightly behind Sara. "And you, Mr. Queen. You started this entire superhero movement. None of this would have happened if you had never put on that hood in the first place." Oliver takes a step back, startled. "And Ms. Zor-el," the agent continues, "she has done nothing but aggravate the Xenomorphs even more. She's inviting them to attack us."

"Well what are you going to do about it? Yell us all to death?" Oliver yells, annoyed.

"No, Mr. Queen. I'm going to take care of the problem that should have been taken care of years ago."

"And how exactly are you going to do that?" Barry confronts him. "You can't kill us, no matter how hard you tried."

"Oh, I know that, Mr. Allen." Smith smirks. "I'm going to send you somewhere you'll never be able to come back from. I cut a deal with the Xenomorphs. I take care of you three, and they leave." With that, he takes out a small alien pistol and shoots it three times before anyone could react. The lasers from the pistol hit Barry square in the chest, and he vanishes in a blue-ish portal. The next shot hits Oliver, making him vanish in a similar portal. The third shot homes in on Kara, Supergirl, and engulfs her in yet another portal.

"What did you do?!" Sara screams at the man, pushing him against his car.

"What needed to be done."

Christian wakes up with a start, hearing a strange sound. He could have sworn he heard a loud thump in the middle of his bedroom, but he couldn't be sure. He looks over at his clock. It reads 4:20 AM. "Ha, 420." Christian says to himself before closing his eyes again and lying back on his bed. However, he wakes with a start again as he feels the cold metal tip of an arrow against his windpipe.

"Who are you, and what have you done to us?" the man holding the arrow growls.

"Bro, I don't know!" Christian panics, thinking he's about to die. "I've been asleep for the past 2 hours!"

"And what did you do before that?" the man growls, louder.

"Bro, I don't know! I was just working on a school project!" Christian is basically pleading for his life at this point. "Please, man, whatever happened to you, it's not my fault!"

"He's telling the truth." A second, softer voice speaks up.

"I know." The first man moves his arrow, and Christian scrambles to his feet as far away from the group as possible. In the shadows, he is able to make out three figures. One seemed to be wearing some kind of hood, another had very weird ears, and the third had a cape.

"Can I just turn my light on real quick?" Christian asks, his voice shaking.

"No!" "Yeah, sure" "Yes" The three say all at once.

"I'mma take that as a yes," Christian replies, edging towards the light switch. "Also, could we keep it down, my sister's in the room right next to mine, and we have school tomorrow." One of the figures nods. He gets to the light switch and flips it on, then gasps.

In the light, he sees the Green Arrow, the Flash, and Supergirl, all standing tall in his room. Christian is backed up against his door in fear. "Okay, guys, nice prank! You can get out of my room now!" Christian quips, still shaking in fear.

"This isn't a prank!" Supergirl looks up at him, and Christian sees her face clearly.

"Oh my god, you look just like her," Christian whispers in wonder, not believing his eyes.

"I'm Supergirl, nice to meet you," she smiles, extending her hand. "I'm Christian, Christian Lee." Christian shakes her hand, then moves back against his door. "Are you guys really-"

"Yes, we're really superheroes," the Flash responds, vibrating his hand at the speed of light.

Christian's mouth drops to the floor. "Wait, so does that mean you guys somehow ended up in the wrong earth and can't get back home?"

Supergirl and the Flash share a look. "How do you know that?" Supergirl asks.

Christian shrugs. "Reasons. Just like how I know you," he points to Supergirl, "are really Kara Danvers, a.k.a. Kara Zor-el, and you," he points to Flash, "are really Barry Allen, and you," he points to Green Arrow, "are really Oliver Queen." The three stare at him in shock before Oliver takes his hood off, goes to Christian, grabs him by the throat, and holds him up against the door.

"Oliver!" Barry exclaims, pulling off his mask and trying to stop him.

"How do you know who we are, and how do you know about the parallel earths?" Oliver asks, menacingly. "I'm only gonna ask you once."

"Put him down!" Kara says, walking over to Oliver. "He's choking, and besides, he can't tell you anything if he can't breathe!"

Oliver scowls and lets go of Christian, who drops to the floor taking gasping and trying to take deep breaths as he regains control of his airflow. "Start talking," Oliver demands.

"Wait, lemme catch my breath," Christian gasps. After a few seconds, he takes one last deep breath and stands up. "Well, I guess I should start by saying-" he pauses, sighs, and resumes, "-Welcome to Earth Nexus, where superheroes aren't real and your lives are detailed play by play on the small screen."

Kara, Oliver, and Barry stare at him in shock. Kara stumbles back and sits on his bed. "You mean we don't exist here?" Barry asks.

"No, you don't." Christian replies, stuffing his hands into his pockets. "In this universe, you guys were created in a series of comic books produced by a company known as DC Comics, and then these versions of you guys were introduced on TV, starting with Arrow." Oliver turns his head in surprise.

"So, you're saying that none of this is real here?" Barry presses, gesturing to himself and his friends. Christian nods slowly.

"Superpowers are fictional here, as are you three. In this universe you guys are just played by actors, and aren't even the slightest bit real."

Barry, Oliver, and Kara take a moment to process this information as Christian awkwardly shuffles around on his feet. "So these shows," Oliver speaks up, "are they accurate to our lives? Is that how you know who we are?"

"I mean, that's how I know who you guys are," Christian replies, shrugging."As for accuracy, I have no ideas. I don't know the kinds of live you guys lead."

"Well, maybe if you figure it out, we can get back home quicker!" Oliver borderline shouts. Barry hits his arm and Oliver moves back slightly.

"Ask us some questions about our lives that coincide with the shows, maybe that'll help," Barry says, standing up and pushing Oliver away from Christian.

"Umm, okay," Christian replies, thinking. "So, given that you all seem to know each other, this is sometime between the alien invasion crossover and seasons 5, 6, and 8."

"Wait, you know about the Xenomorph invasion?" Kara questions, intrigued.

"Yeah," Christian responds. "It's when you guys all meet for the first time, Cisco stops being mad at Barry, Stein meets his daughter, and y'all defeat the aliens and live happily ever after." Christian carelessly adds.

"Cisco forgives me?" Barry questions, hopeful. "Wait," he says, confused. "Stein has a daughter?"

"We actually win this?" Oliver adds questioningly.

"Oh, right, you guys must be in the midst of the Xenomorph invasion. But then, that begs the question, how did you guys get here?" Christian asks, confused.

"We don't know," Barry replies. "All we know is that one minute, we're doing our superhero business, confronting that one federal agent dude, then he shoots some alien tech at us and we're here now."

"Well, that's not supposed to happen," Christian ponder the situation.

"What do you mean, what is supposed to happen?" Kara asks.

"I don't think I should tell you, I could ruin your guys' timeline."

"Oh, even more than it's already ruined?" Oliver interjects, annoyed. "

Well, fine, I guess that that interaction with Smith already makes your version of Invasion! different from mine. According to the original Earth Prime timeline, Smith would leave and you all would forgive Barry, band together, have a big, awesome fight scene, then be rewarded by the President and have drinks." Christian answers.

"Well that's not happening now, is it?" Oliver presses.

"I don't know, I mean, it still could happen if we return you guys to the exact same spot you left somehow." Christian answers, unsure of himself. "For now, I suggest you guys figure yourselves out, because a trans-dimensional portal or whatever can't be done 4:30 in the morning. I can get some mattresses and blankets for y'all. You'll have to spend the night." The trio nods as Christian sets up camp for them.

"Barry, how will we get back?" Kara asks worriedly.

"I have no idea," Barry responds.

"One step at a time, folks," Oliver adds as Christian sets up their beds for the night.

"Well then, lights out?" Christian asks.

"Lights out."