Disclaimer: I own nothing. 'The Flash' and 'Supergirl belong to their respective networks, and DC. All I'm doing in playing in the universe that the creators have created.

STAR Labs, Cisco's Lab.

Cisco sighed before he sat back on his seat and smiled at the goggle-like device on his workbench. It looked similar to the one his duplicate on Earth-Two, Reverb, had worn when they met. It had been a month since Barry 'The Flash' Allen returned from his jaunt to the past so that he could talk to the Reverse Flash, Eobard Thawne, who was disguised as his mentor, Harrison Wells. Cisco cracked a smile as he leaned forward and remembered Barry telling him the only difference that he noticed so far was the inclusion of Hartley Rathaway as an ally to Team Flash. Cisco stood up and picked up the updated goggles with both of his hands as he remembered the Speed Force equations that the past Harrison Wells gave Barry, the same equations that he had to access through the past Wells' present day time vault in STAR Labs. Those equations helped Barry and Cisco create a tachyon power source based on the design that Eobard used to increase his speed as the Reverse Flash when he would sit on his wheelchair.

"Now we have a way to fight Zoom," Barry told him a week ago when they finished the tachyon prototype with Harry, the Earth-Two version of the real Harrison Wells who was stuck in Earth-1 due to the closure of all the breaches. For the past week, Barry had been increasing his speed; something that bordered on obsession especially after the discovery that Zoom was really Jay Garrick, someone who the team considered an ally.

That revelation brought a lot of things to their minds; especially how it was that Zoom was Jay Garrick when they saw Jay die in front of their eyes after Zoom phased his own hand through the Earth-2 speedster's chest. While building the new tachyon prototype, that was the question that Barry, Harry, Cisco, and Caitlin were asking themselves.

They had come up with various explanations, but none of them stuck.

"I guess the only way to find out would be to open the breach to Earth-Two," said Caitlin with a frown.

"We need to get Barry's speed up," said Harry as he stood with his crossed over his chest, "that;s the only way he can beat Zoom, or Jay… can't believe it's Jay."

"I'll get faster," said Barry nodding his head at Harry with determination etched on his face, "I know the prototype will work, and when it does. I'll get faster, and then I'll stop Zoom from hurting your world, and I'll pay him bac for hurting us."

"Get your speed up first, Mr. Allen," said Harry as Barry just nodded his head.

Back in the present day, Cisco slipped the goggles onto his face. He wanted to see if he could control his vibes. The last time he vibed was without the goggles, and that was every time he came close to Jay's helmet; he would see Zoom holding up a screaming woman over a rooftop, but he could never see her face. Shaking his head off that memory, he hoped that the upgrades he performed based on his counterpart's technology would help him to not only look into Earth-two, but find the dimensional frequency that would help Barry travel back and forth between universes safely, with the use of Harry's calculations, without creating any other breaches.

Taking a deep breath, Cisco pressed a button at the side of the goggles, and he suddenly felt a shift in the air around him. The young man saw a flash of light and the feeling he'd get when he 'vibed', a tingling sensation throughout his whole body, as everything melted away and he found himself in an office. Confused about where he was, Cisco looked around and saw a sign called 'Catco', and then he looked at people behind their desks typing away, and then an angry woman walked past him. He looked on with his eyes narrowed as the angry, dark haired woman pushed aside a young man who was trying to stop her. Cisco felt something bad was about to happen as another young woman with blonde hair got up and then walked around her desk and asked the dark-haired young woman, Siobhan, to leave the building. Cisco couldn't hear what Siobhan was saying, her voice sounding as if it was very far away, but he heard the loud scream that made him cover his ears.

Cisco then saw the young blonde being thrown through a window, and then everything stopped and he looked around. The young man saw the date and time, and then there was a flash of light and he found himself standing at the side of the road of a city he didn't recognize. Cisco looked around and narrowed his eyes in confusion when he saw the sign for 'National City Bank'; the date and time was posted right underneath the sign; it was three days later.

"National City? What am I doing here? Wait, I never even heard of a National City, there is no National City," he told himself just as something crashed into the bank. He heard people screaming and running right through him as another object crashed in front of the bank. Before he could even get his bearings, Cisco instinctively ducked as something flew out of the destroyed bank and hit the thing that crashed onto the road earlier. Everything slowed down for Cisco as the two objects flew over him. Looking up over his head, Cisco could see that what he wasn't looking at two things, he was looking at a bleeding blonde woman who was flying in a blue costume that had a stylized 'S' on the chest. Or at least it used to be an 'S' since there was a tear across the symbol that was covered in blood.

Cisco then looked at the monster, and his blood froze.

It was grey in colour, large… larger than the blonde woman it was fighting, and then he saw the protruding jagged bones on its knuckles, and all over its body. Time then sped back up as Cisco turned and saw the blonde woman crash the monster onto the street. He saw people running away as the dust rose up into the air, and the street started to crack at the sound of thunder. But the skies over this city, that he had never heard of was clear, and through the dust he could see the blonde repeatedly punching the monster that was trying to get up. He got closer to the action and heard the woman screaming at the creature.

"Dad, Dad! Regain control… think of Alex, think of me.. I need you to stop. Please! Stop! Don't make me… upphh."

Cisco heard the creature scream before it hit the woman hard; a hit that sent her flying into a building.

"Holy crap," said Cisco as a blur shot out from the building and hit the creature again. Cisco saw the woman hit the creature continuously until it hit back and she was on the ground. He saw her struggle to get up, but the creature was faster, and it punched the young woman onto the road facedown, causing cracks to appear. Cisco could hear her scream in pain as the jagged bone jutting out from the creatures knuckles dug deep into her back.

"Dad! Stop! Stop!" shouted the woman as she looked over her shoulder, "please! Don't make me do this!"

Cisco heard the creature roar as it continued to stab her back, and the woman screamed in pain. She then rolled while screaming in pain onto her back, the creature missing what Cisco thought would be the final punch which hit the street instead. He then heard the woman scream in anguish before she fired two beams of blue light that shot into the creature's eyes.

"Oh," shouted Cisco as he put his hands over his head as the young woman screamed while the beams grew in intensity. He heard the creature screaming in as it continued to push forward. Cisco saw the creature pull back an arm as it got closer to the screaming woman. He saw the beams from her eyes intensify, and the creature's head start to become red in colour.

When the creature was close enough, the beams went through its head, but the punch was already heading for the weakened woman. Cisco saw both bodies fall onto the ground.. the headless monster, and the woman whose whole left side of her face had four deep gashes that cut into the bone. She lay unmoving. It was just then that Cisco felt a vibe before finding himself back in his lab.

Panting, the young man took off the goggles and threw them onto the workbench while his eyes were still wide open in shock as he imagined the dead woman in the costume. Knowing what he needed to do, Cisco grabbed his goggles and ran as fast as he could to the Cortex where he knew that Harry, and Caitlin were doing their research; Caitlin on further improving Barry's speed, and Harry on a way to safely open a breach to Earth-two.

"Guys!" exclaimed Cisco as he ran in and got onto the communications system and called Barry back in from his practise runs, "Barry, we need you at the Cortex, it's urgent."

It took at least two seconds for Barry to run in through to the Cortex in a gust of wind and the familiar yellow lightning contrail behind him as Harry, and Caitlin walked up to Cisco who held up his goggles.

"I just saw something so trippy that… wow."

"What did you see?" asked Harry, "Zoom?"

"I think I saw someone who could help us fight Zoom," said Cisco as Barry nodded his head while Caitlin looked on in disbelief. Cisco noticed the look on Caitlin's face and told his team what he saw when he vibed. As he kept on sharing what he saw, the more their jaws dropped, especially when he told them about the girl in the costume who could fly, and was super-strong. He went on to tell them about everything he saw and heard. And when he was done, all Cisco did was wave his hands about and asked one question.

"Well?"

"She sounds like she can help us with Zoom," said Barry, "and if she's not a speedster, then that's even better… Zoom won't be after her. She could be our ace in the hole."

"That's all well and good," said Caitlin, "but how do we get to that universe before she dies? I mean, that's what we need to do too, right? Prevent her from dying. I'm guessing that whatever was fighting her, was really fighting her. I mean, if their fight was that brutal, then it's not going to wait for her to return to her own universe. It may attack anyway, but that's just a theory."

"Barry can help her fight it," said Cisco, "she was fighting it alone."

"And how do you intend to open up a hole to that universe?" asked Harry as he looked at Cisco, and then at Barry in his Flash uniform, the circular prototype tachyon device was attached just over his lightning emblem, "my calculations are no-where near ready to open a breach safely. Give me a few more days; with Ramone, I need two. If you're thinking about punching through the dimensional barrier with pure speed with the prototype? You could create weak spots that Zoom can, and will, find to come here before you're ready, Barry. You're fast, faster than you've ever been after practicing this past week with that prototype.. but you need more time."

"But if we can get this person on our side," said Barry, "then she could be just the extra power we need to…"

"Guys," said Cisco as everyone turned to looked at him as his eyes opened wide while saying that he was vibing, "that girl… the one who screams? She just entered an elevator and… and.. Barry?"

"What do I need to do?" he asked as Cisco stepped back after the vibe was gone before he ran to Barry. Cisco grabbed his goggles and took out a chip, and then took off the prototype from Barry's chest and headed to the table. Barry and the others watched Cisco work faster than he had ever seen him work. Once he was done, he reattached the prototype onto the Scarlet Speedster's uniform.

"That's fixed to the vibrational frequency of the other universe," said Cisco pointing at the prototype device, "now I need you to run fast… very, very fast."

"How fast?" asked Barry.

"Just run," said a worried Cisco, "you've got no time."

"How do I get back?" asked Barry before he prepared to run.

"Take out the chip," said Cisco, "the prototype will revert to our dimensional frequency, then you run, and you'll be back. Now go."

"Yes, boss," chuckled Barry before he ran. The young man ran through the hallways, through the stairwells, and then he ran out into the open. Barry ran faster and faster until he could feel the Speed Force itself permeating through his body as if he was riding on lightning. He heard the sound of a boom just as a tear opened in front of him and then he ran into it. Barry entered the multi-verse as he ran through the connecting corridor to the Earth he was heading for. It was a few seconds later that he ran out onto a street and past several cars as he looked around for the name of the building that Cisco mentioned.

National City, Alternate Universe.

'Catco,' though Barry to himself as he looked around the immediate area while it seemed as if everyone else was standing still, 'oh, there it is and… no."

Barry saw everything in slow motion as he ran faster towards the body falling through the broken window. He ran surrounded by yellow lightning as he went up the side of the Catco building, grabbed the young blonde woman in mid-air, and then headed back down to the pavement below where he placed the feet of the dazed woman on the ground while he looked back up the side of the building. It was just then he heard the sounds of mumbling people around him as he looked around at the stares he was getting, and the flashes from the camera phones before he looked with concern at the blonde he was holding on to.

"Are you alright?" he asked as the blonde nodded her head and stumbled to one side. Barry helped lean her against the wall before he told her that he'll be right back.

It was a few seconds earlier that Kara Danvers approached the recently fired Siobhan Smythe, who was in the Catco building illegally. Kara remembered telling the dark haired woman to leave just before she screamed. Before she realized what happened, Kara found herself dazed feeling as if she was hit by a very, very big truck and flung through the window, she had a sensation of falling through the air. But she couldn't will her body to stop, she was that out of it. Then, for an instant, she felt her body stop, and now she found herself on the ground… her memory shifting between wondering if she was dreaming, or if she really just saw a man in a red suit standing in front of her. A man who just saved her. She looked at the man while she was dazed, and could barely hear him as she tried to walk away. As Kara tried to make sense of what just happened, and get the ringing out of her ears, she saw that man in red become a blur surrounded by orange lighting before he ran up the side of the Catco building.

'What just happened?' thought the blonde as she rushed to where the people were looking up at the side of the building. Shaking her head, Kara then ran as fast as she could back into the building. She headed to the stairwell where she shook her head before changing into her Supergirl uniform and flew out of the rear exist and then around to the front of the Catco building to the gasps of the people below. Using her enhanced hearing, Supergirl listened to the mumbles of the people below as they asked each other if she was really here for some nefarious purpose. Supergirl frowned at some of the other things she heard, and knew that it would be some time before the people trusted her again after the fiasco with the red kryptonite. However, as she was going up the side of the building, she saw the blur heading the other way; down the building with yellow lightning trailing behind him. Confused about what was happening, Supergirl first continued up the building and only stopping at the broken window as she looked questioningly at her best friend, Winn; James Olson, and Cat Grant who all told her that Siobhan left through the elevator, while a man in a red suit jumped out the window just as she got up there. Shaking her head and thanking them, Supergirl then went back down and landed next to the man in the red suit who was looking around while rubbing the back of his head.

"Excuse me?" said a very confused Supergirl.

"Sorry," said the Flash as he looked at Supergirl and then started to looked around the crowd, "the woman I just saved, she was looking out of it and.. well, she's not here."

"She's a friend," said Supergirl as Flash looked at her again, "she's got this emergency watch that she uses to call me, and well… by the time I got here, you already saved her. So I took her to a safe place and then I come back here and… well, here you are. Whoever, you are."

"About that," said Flash as he looked at the 'S' shield on her chest, and then back at the young woman who was looking back at him with an eyebrow raised, "apparently the person who did whatever it was that threw your friend through the window left through the elevator and I came down here to… well, check on your friend before.."

Flash saw Supergirl's eyes widen as she looked right over his shoulder. He turned just as he and the blonde were hit by a loud scream that slammed the Scarlet Speedster into Supergirl. The both of them sent tumbling onto the ground while their hands were covering their ears, as were the other bystanders around them.

'Oh God that's just as bad as Rathaway's gauntlets' sonics,' thought the Flash to himself as he and Supergirl were groaning in pain while covering their ears, trying their best to block the scream unsuccessfully. Then just as it came, the scream was gone. Flash tried to stand up while he looked at the smiling woman who was walking towards them. He could see that she breathed in for another scream, and he knew that his equilibrium was off with his ears still ringing. But it was too late to move as he fel onto the ground again when she released another scream at them.

Flash put his hands over his ears and knew that he and the blonde had to get out of there. He and the young woman who was rolling on the ground with her hands covering her ears had to get clear; he knew he shouldn't use his speed now to fight this woman since he was feeling unbalanced. So he grabbed the barely moving blonde and ran as fast as he could. Siobhan looked stopped screaming at Supergirl and the red stranger and watched as the trail of lighting vanished before smiling to herself. She then put her hands into her pockets, turned, and walked away. She had someone she wanted to meet. Someone who could be an ally against the same enemy.

'Goodbye, Supergirl,' Siobhan thought to herself, "you're done."

TBC.