Alternate Earth.

By the time Flash stopped running, he was already in the desert outside National City; there he placed the feet of the blonde woman in his arms back onto the ground and helped her to stand up straight, all the while hoping that the ringing in his ears would soon vanish.

"You alright?" asked the Flash as the blonde was bending down, her hands on her knees while shaking her head, and then standing up again and taking a deep breath while opening her mouth and then closing it once again while rubbing both of her ears. All the while Flash looked on in concern as he tapped on her shoulder, "ummmm.. hey, you okay?"

"Yes," said Supergirl as she shook her head before turning to face Flash, "how'd you do that?"

"What?"

"That," asked Supergirl as she used her fingers to mime someone running.

"I just ran?" said the Flash shrugging his shoulders as Supergirl gave a small smile while continuing to rub her ears.

"Ask a dumb question," she replied as she opened and closed her mouth again while looking straight ahead at him, "ummm….. who are you?"

"The Flash," he replied as Supergirl looked at him while narrowing her eyebrows, and with her hands on her hips, glad that her ears just popped. But now, she had to deal with a stranger who took her out of danger by running extremely fast. Before she could even ask him where he came from, the man in the red suit continued on with his answer, an answer that made her look at the man calling himself the Flash in disbelief, mixed with a tiny bit of confusion, "I'm based in Central City, but not in the Central City of your Earth. Wait, do you even have a Central City on your Earth? Because I have to say that National City does not exist on my Earth."

"What?" asked Supergirl shaking her head. She thought that her hearing was still off since the man in the red suit seemed to say that he had come from another Earth, 'which is impossible, isn't it?'

"Umm… sorry, but…. but what do I call you?" asked the Flash.

It was a question that got Supergirl even more confused. Everyone knew who she and her cousin were, they didn't know their secret identities, but they knew Supergirl and Superman.

"I'm Supergirl," she replied as Flash looked on impressed, "wait, you haven't heard of me?"

"No," said the Flash shaking his head.

"How about Superman?" asked Supergirl looking at the Flash quizzically.

"Nope," said the Flash to a surprised Supergirl, "I guess you don't exist on my Earth."

"Wait, wait, wait," said Supergirl waving her arms about while shaking her head. She felt as if her mind was about to burst while she thought about the implications what Flash was saying, "let's take this from the top; you're from another Earth?"

"Technically a parallel Earth," said the Flash, "but yeah."

"And you're from Central City, but not the Central City here," asked Supergirl as she pointed to the Earth before pointing up to the sky, "you're from a Central City on another Earth."

"Basically, yeah," said Flash nodding his head.

"And you're a Superhero?" asked Supergirl as she rubbed the back of her head while pointing at the Flash with her free hand, "a Superhero from another Earth? Here?"

"Uh huh," said the Flash as he noticed the blonde's face turning green, "ummm… you gonna be okay? Do you have a home or… or can you fly there or…"

"I.. I need to go back to the city and.. and my boss…"

"Your boss?" asked the Flash confused as Supergirl prepared to jump, but then she stopped, shook her head again, and looked at Flash with her head tilted to one side, and her eyes narrowed while trying to keep her excitement down at finding another superhero who wasn't her cousin. Instead, this was a superhero who claimed to be from another Earth, a parallel Earth.

"A Superhero from another Earth?" asked Supergirl again as her voice involuntarily squeaked, "really?"

"Yeah," said the Flash as he took off his mask. He was aware he was taking a big risk, but considering that the woman in front of her hadn't even heard of his alter ego, he thought revealing who he really was would help build some trust, "look, my name is Barry Allen. I'm from another Earth where my best friend has the ability to see into parallel Earths. He saw something happen to that friend of yours. He saw that screamer back there flinging that friend of yours through a window. He then saw you in a big fight where… look, I'm just here to help. And I'm hoping that you could help me too."

"Oh," said Supergirl as she continued to look at Barry's face.

"Ummm…." said Barry as he waved his hand in front of the woman's face. She the shook her head and smiled at Barry before saying that she hadn't met any other superhero's other than her cousin, Superman. She continued to say excitedly that this was even the first time she met someone claiming to be from another Earth who came to her Earth just to help.

"Yeah," said Barry as he put on his mask again before looking at his red suit, "I actually left in a hurry since my friend, Cisco, saw your friend about to be flung out of the window, and so I didn't exactly get a change of clothes. Do you if there's a…"

"I know a place," said Supergirl before shaking her head and then putting her hand forward, "I'm Kara Danvers… the falling girl and…"

"Oh," said Barry as he mimed the glasses that Kara had been wearing, "not a bad disguise. Hiding right in plain sight, sweet."

"My cousin's idea," said Kara as she smiled before she waved her hands about, "I need to get back to Catco and get my clothes, and then we'll go get you something to wear. I don't think you'd want to be in the suit the whole day, I mean you do kind of stick out."

"I do, don't I," whined Barry as he looked down at himself again before looking up at Kara's smiling face, "so what you think? Glasses?"

"You wear a mask," said Kara with an eyebrow raised, "no one can see who you really are."

"True," replied Barry with a nod, "so…"

"Oh, right," said Kara as she pointed towards the city in the distance, "meet me on the roof? I'll get changed and then I'll meet you there, I'm sure that some my friends would like to meet you.. I mean you're from an alternate Earth which I'm still trying to wrap my head around and.."

"Breathe," said Barry as Kara closed her eye and breathed in deeply, interrupting her babble, "actually, there's more we need to talk about."

"One at a time," said Kara as she smiled, "think you can keep up?"

"Try me," grinned Barry just before Kara shook her head smiling, and took off into the air.

"That's just so cool," he said before he started to run. In a few seconds Barry had caught up to her, he could feel himself going faster as he eventually overtook the flying blonde. Barry slowed down slightly to keep pace with her, and then once they reached the Catco building, he ran up the side of the wall while he looked back and saw Kara enter through the back door. It took a few seconds for him to reach the roof before he took off the tachyon prototype that was on his chest, held it in his left hand and sat down on the helipad with his feet hanging off its edge. While waiting for Kara, he looked around the city and wondered if there was a version of him that existed in this universe.

'If I do exist,' thought Barry to himself as he looked into the distance, 'where am I? Is mom alive here? Are we together as a family?'

It took another forty minutes before the roof access door behind the helipad opened up. The Flash turned to look over his shoulder and saw Kara walking towards him after a change of clothes, and her glasses, and with her hair in a ponytail. Flash got up to his feet and walked towards Kara who was apologizing for being late, she told Flash that Miss Grant wanted to talk to her since she was now news, and then she showed the blonde a picture that someone sent to Catco.

"One was of you and me," said Kara, "I mean when you held me up right after I flew through the window and fell, and the other one was of me in costume, standing with you before Siobhan attacked."

"So.. this Siobhan?" asked Flash, "she's the screamer?"

"Yea," said Kara, "but first, let's get you something to wear… I know a place so…."

"Where is it? I mean the general direction," asked Flash as he turned and looked out at the city. Kara stood next to him and pointed at the general direction of a store she was talking about before handing him some cash. Barry looked questioningly at Kara who asked him if he had any pockets on his suit.

"Yea, actually," said the Flash, "for emergencies in case I feel like I'm getting low on sugar, and…"

"Even if you do," said Kara as she looked around while waving her hands, "different universe, which you still have to explain to me how you got here, and anyway I'm guessing your money's not the same as the ones here. There could be some small differences and… well… then you'll be technically passing around fake cash, and I'll have to catch you."

"I don't mind," said Barry as Kara blushed while fixing her glasses, and then Barry realized how he said what he just said, "okay, that didn't come out right."

"Yea," coughed Kara nervously.

"So, that way?" asked Barry as he pointed over his shoulder while Kara nodded her head before telling him the name of the store.

"Be back in a flash," said Barry as he ran down the side of the building as Kara looked over the edge, and then watched with a smile as the streak of orange and red ran into the distance.

"That's so cool," said Kara as she stood up with her hands on her hips. She waited for a few minutes before she felt a gust of wind, and the familiar crackle of electricity as Barry appeared in a pair of jeans, brown jacket, and a blue shirt. Impressed, Kara asked him where he kept his suit as they walked towards the roof access door. Barry told her that he was wearing it underneath his clothes, and that's something he had to do the entire time he was going to be in her universe.

"I usually have the suit stored in STAR Labs with my team in Central City and…" said Barry as they walked down the stairs when Kara interrupted him.

"Oh," she said, "after talking with Miss Grant about her interviewing me about what happened with Siobhan, and telling Winn and James to hold up with asking any questions about the man in the red suit; I checked up on Central City, and STAR Labs. They do exist in this universe. I hope you don't mind."

"No, thanks. That's sweet that there's a STAR labs here," said Barry with a smile; a smile that vanished when Kara stopped at the landing and then turned around to look at him nervously, "Kara?"

"I'm sorry," said Kara, "I shouldn't have checked this, but I'm guessing that you wanted to look up yourself and… and…"

"I don't exist?" asked Barry, "I mean it's possible that I was never born or…"

"You died," said Kara as Barry looked at her stunned, "I read a news report that you and your father died, only your mother, or your doppelganger's mother, Nora Allen survived."

"What?" asked Barry as his hand held on tight to the railing.

"When I read that part, I stopped," said Kara, "I figured that I intruded in something private and…"

"I'd like to read that report," said Barry as Kara nodded her head.

The both of them then got onto an elevator before heading to a room that Kara, Winn, and James used as their own private 'Super-cave'. Barry asked Kara if he could use one of the computers; to which Kara nodded her head before she picked up a phone and called Winn, telling him where she was and to meet her in ten minutes. Kara then walked to where Barry was seated and watched as he pulled up old news reports from the internet.

"I'm sorry," said Kara as Barry leaned back on the chair and locked his jaw in anger at the content of the report he was reading.

"Henry Allen and his son, Barry, eight years old, was found mysteriously dead," read Barry out aloud, "both had ruptured hearts, but there was no sign of blood anywhere. Nara Allen claimed that she witnessed a… no… a lightning storm in the home. Oh God…"

"Barry?" asked Kara as Barry turned the chair and looked at her with anger in his eyes.

"When I was a boy," said Barry, "my mom was killed, and my dad was convicted for her murder."

"I'm sorry," said Kara shaking her head.

"The thing is, I saw red and yellow lightning swirling around my mother," said Barry as Kara looked on, "I saw a figure in that swirl of energy. And the next thing I knew, I was few blocks away from my home. When I ran back home, I saw my father being taken away in handcuffs, and my mother was stabbed to death. That electrical energy? That storm that I saw? The storm that my mom in this universe saw? Was the Flash fighting another rogue calling himself the Reverse Flash. In my universe I beat him, and he confessed to killing my mother and now my dad's free."

"But.. wait," said Kara pointing at the report on the screen, "this happened years ago."

"Time travel," said Barry.

"You can… wait… huh… you can time travel?" asked Kara confused.

"Long story," said Barry as he looked at the news report again, "according to the report in the paper mom said that she saw a figure in that lighting storm in the house; red and yellow lighting. I guess.. I guess the version of the adult me that existed wasn't fast enough. Eobard…"

"Eobard?" asked Kara,

"The Reverse Flash," said Barry looking at Kara, "his real name is Eobard Thawne."

"What kind of name is Eobard?" asked Kara.

"Future name?" said Barry.

"Oh, time travelling speedster?" asked Kara while Barry nodded his head, "huh."

"Who would have thought, right?" said Barry looking at the screen again, "Eobard killed me, I mean the other me. So the Flash never existed in this universe. But the report doesn't say what happened to mom though."

"I can find out for you," said Kara as Barry nodded his head before thanking her. Barry then typed names into the computer before sighing. He then turned around and told Kara that his friends didn't exist on this Earth either.

"I…. what the…" said Kara as she stepped back.

Noticing the surprise on Kara's face, and how tense she had become while looking behind him. Barry quickly stood up and turned around, only for a smile to appear on his face.

"Cisco?" asked Barry as he approached the fuzzy, ghostly image of his best friend who was wearing the goggles.

"Can you see me?" asked Cisco as Kara eased up slightly and walked next to Barry, "Barry, I can see you standing next to a girl.. wait, is that the same one I saw before you ran through the breach? Barry?"

"I can hear you Cisco," said Barry as the smile on Cisco's face widened and he waved at Barry, and then at Kara, "oh, this is Kara Danvers. The victim of the screaming girl and… wait.. how are you here? Why could I see you and… again, how are you here."

"I don't know," said Cisco, "I was working on a new chip to replace the one I installed in your tachyon prototype when I got another vibe. I saw that girl in blue getting electrocuted while you were knocked out… then I saw them kidnapping some woman from Catco. It's weird but I just finished modifying another chip, and then put my goggles on and concentrated on getting a message through to you… I mean this is real trippy… and I mean trippy cool."

"Thanks, Cisco," said Barry.

"There's something else," said Cisco, "I didn't just finish the new chip to tell you about the blue girl, there's…"

"Kara?" asked Winn and James together as they rushed in, and looked at a ghostly image of someone they hadn't met, and then they looked at Kara who raised her hand towards them.. signalling that they hold off any questions until later.

"What's…?" asked James as he looked at the stranger standing next to Kara.

"Winn, James," said Kara, "this is Barry Allen, he's from another universe, and the ghostly figure there is Cisco, a friend from home sending a message to help Supergirl… so let's hold off all the questions until later."

"Supergirl?" asked Cisco as he looked at the blonde, "the blue girl's called Supergirl?"

"Yes," said Kara nodding her head proudly.

"I don't like it," said Cisco as she smile on Kara's face vanished and Barry covered his mouth an chuckled, all the whole James and Winn looked confused at the two strangers, "maybe Powergirl, or Powerwoman, based on what I saw from her power-set but…"

"Cisco, focus," said Barry, "you were saying that there was something else."

"After you left," said Cisco as he looked at Barry, "I think there was a ripple effect on the dimensional barrier after you punched through to the other universe; we've detected exotic energy emissions using the STAR Labs satellites."

"How many?" asked Barry as Kara looked at him after hearing his heart racing.

"Fifty-two, the power signatures match with those from Earth-Two" said Cisco, "I'm sorry Barry, this was my fault, I…"

"We did the right thing," said Barry as Winn and James pulled a reluctant Kara away from Barry and talked to her in whispers at a corner of the room. Barry looked over his shoulder at the three of them, and then at Cisco, "how bad?"

"Harry and Joe took some measurements at a few sites," said Cisco, "and all we have are small tears, more like cracks actually. It's not big enough for anything to get through.. at least not yet. They could open tomorrow, next week, or next month, or even a few minutes from now. We're not sure yet."

"I'll talk to Supergirl and…"

"Don't come back yet," said Cisco, "not until you've done what you need to do. You need to save Super…"

"I'll get her attention," said Barry interrupting as he looked over his shoulder at Kara who was looking back at him with her eyebrows narrowed in confusion while the other two men were still talking to her, 'she heard… she must have picked up on what Cisco just said. Enhanced hearing too? Wow.'

"if you can convince her to help us here, then all the better," said Cisco, "Harry thinks that just you running back here will cause another ripple effect that'll open all of the breaches. And then…"

"Zoom," said Barry as Cisco nodded his head.

"It'll help if she was here, Barry," said Cisco.

"Against Zoom," said Barry as he looked over his shoulder at Kara, who was looking back at him, "I need all the help I can get."

"Good luck, Barry," said Cisco, "see you soon… and whatever you do, survive. Because if you don't? I can guarantee you that Caitlin, Iris, and Joe will kill me first, and then bring you back to life, and then kill you; and Harry will just say 'I told you so'."

"Be safe, Cisco," said Barry as Cisco waved his hand before vanishing.

"Barry?" asked Kara.

Barry took in a deep breath before turning around to face Kara, who was flanked by a young short-haired man in a shirt and tie, and on Kara's left side was a dark skinned bald man who was looking at Barry with eyes narrowed. Barry then waved his hand.

"Hey," he said, "my name is Barry Allen, and I'm from another universe."

TBC.