A/N: So working with CharmedMillie on her extremely popular Karry One-Shots (now known as Karry Universe) and in the build-up for the Supergirl/Flash crossover I had this insanely awesome dream of what that crossover could be. Of course it was nothing like what we were shown (which in itself was more than awesome), the dream stayed with me and, talking to various friends, I decided to make it into a FanFiction! Tied in to Flash we know, the Supergirl/Flash crossover and a large dollop of something new altogether I finally came up with a three-chapter story of my own. I really hope you enjoy and understand what's going on. Be sympathetic and review, please.

Disclaimer: I own nothing. Wish I did though. Damn you CBS/CW/DC…

Chapter One – Stranger than Fiction.

It had worked, he was sure of it. All he needed to do was stop. Just stop.

He couldn't – hurtling out of the vortex between worlds at top speed, Barry's legs were out of control and he could barely keep track of where he was going until…

"What?"

He was suddenly in the air. No ground under his feet. Had he run so fast he had managed to get airborne? He certainly hadn't run up a building to do so.

"I don't know who you are but I have enough on my plate with your blue friend," the voice was familiar as Barry looked around as best he could.

"Kara?!" Barry exclaimed, seeing the familiar face, he now confused. He had just left her. He had been so sure he had gone to his home universe. Why was she here?

"You know me?" the girl in the blue and red costume almost stopped, her concentration broken.

"We just… can you put me down?" Barry asked, trying to catch up with what was just happening. Did he run into the past of her Earth, maybe? Is that why Kara didn't know him?

"Not until we get to the DEO!" Kara stated, shouting a little over the slipstream.

"Been there – we're going in the wrong direction though," Barry amused himself, letting himself hang in Kara's grasp now as they headed a direction he recognised from another world altogether. "Wait, that's STAR Labs!" he cried in shock as the familiar circular building flew below them, Kara suddenly circling it before landing. "Why's the DEO in STAR Labs?" Barry now insisted to Kara, who grabbed his wrist, ignoring the question as she led him in to the familiar halls.

The halls were the only thing recognisable about the place though; inside, the labs were changed, there were military personnel all placed at strategic intervals and all pointed their weapons at Barry, who raised his free hand in surrendering worried as he was lead to a middle-aged man with a strong jaw and dark hair.

"Jeremiah Danvers, head of the DEO," he introduced himself importantly to Barry, who couldn't quite take in what he was seeing, but things were slotting into place. "I see you've met my daughter."

"Daughter?" Barry repeated dumbfounded, glancing back to Kara who looked resolutely at Barry. He knew a bit about Kara's Earth and he knew for sure Lucy Lane was head of the DEO. She had definitely been so when he was there barely half an hour ago. He had an idea he knew what was going on now though. "I'm sorry, I don't know what –"

"We don't know if you're a friend, accomplice or partner to our blue blur but having you in our facility should work to our advantage. Well done, Supergirl," Danvers addressed Kara, pleased as someone grabbed Barry's arms, he felt handcuffs being placed on his wrists as he looked worriedly to the apparent head of the DEO.

"Blue blur…?" he asked tentatively, a sinking feeling in the pit of his stomach as, without another word from the head of the DEO he was lead to the pipeline.

It seemed he had landed on another Earth, one where the DEO and STAR Labs were one and the same, which meant that Harrison Wells or Cisco Ramone or even Caitlin Snow must be around here somewhere. And there was a blue blur terrorising the city. Or cities. That meant only one thing, unless Velocity 9 was freely available to this world: Zoom had found this Earth. Barry needed to cooperate, and get himself free as soon as possible.

"I'm not a friend of your blue blur, quite the opposite in fact," Barry pointed out to the person leading him to the pipeline – a woman with short black hair and a look of concentration shared only with Kara Danvers. Or at least this Earth's version of Kara Danvers.

"Then why do you possess the same powers?" the woman asked, the door to a cell being opened as Barry had to act quickly, without being his natural speed, of course. He didn't want to freak them out more than he apparently already was.

"Because he and I come from different worlds, we were both exposed to the same sort of… radiation which is where we got our powers, but he's been terrorising my Earth for months now, and I'm the only one who can stop him! Please…" it hadn't worked though, he found himself within a cell, reflecting back on the recent event in which Trajectory managed to lock him up like now.

The woman however remained outside the cell as she looked to Barry, seemingly with deep thought before she finally asked: "How do you know my sister?"

"Sister?" Barry asked, dumbfounded. "Who's your sister?"

"Kara. Supergirl" she stated, annoyance now in her voice.

"Oh my god!" Barry responded, grinning as he stated excitedly: "You're Alex! I'm glad to have finally meet you, well a version of you anyway."

"A version…?"

"It's like I said. Look, do you have Harrison Wells working here? Or Cisco Ramone? Maybe Caitlin Snow?" Hopefully one of these familiar faces, although alternative to the people he knew, would be more understanding.

"Doctor Caitlin Raymond" Alex put emphasis on the new last name, causing Barry to smirk in spite of himself at the implications that could mean, "left a while back, but we do have Mr. Wells and Ramone, yes" Alex replied, stiffly.

"Please get me Wells," Barry begged, going the extra mile to actually clasp his bound hands together in full-out begging mode and then, to show he meant no harm, removed his mask to reveal his full face.

"Okay" Alex replied finally. "But I'm not letting you out." She turned and left the room, Barry letting out a relieved sigh as he slumped back on the wall, worry now beginning to spread through him; how long had Zoom been here? If he could travel to this Earth, how many others had he been to? What state would Barry find his Earth when he eventually got back there? Would he return home? It wasn't exactly like he could set coordinates to get back easily; each time was literally a leap of faith.

"So what do we call you?" Barry looked up and, for the first time in his life, was grateful to have Harrison Wells in his line of vision. Well a version of him at least. Behind him were Alex, Jeremiah and Kara – still in full Supergirl outfit. Now Barry had his mask off and she could see his face, she looked slightly shy, which was weird. If she was anything like the first Kara Danvers he met, she'd be geeky, awkward and happy but never directly shy.

"I'm Barry Allen sir," Barry addressed Wells "and I'm from an alternative Earth."

"Alternative Earth?" Wells asked, intrigued but doubtful.

"Yes. On my Earth I know you, well I know two you, well sort of. It's a long story. But the you I know, the current one, has a daughter, Jesse, who you love more than anything on any world." He hoped this Wells was of the same make; if he was a disguised Eobard Thawne though…

"I have two daughters," Wells stated abruptly. "One is indeed called Jesse. What has this to do with you, Mr. Allen?"

"I'm just trying to gain your trust and trying to explain the multi-verse theory, which is actually fact," Barry spoke at top speed, his eyes locked on Wells as he ignored the three Danvers'.

"I know of the multi-verse theory," his voice remained level, "you have hundreds, thousands of different Earths, all vibrating at different frequencies –"

"That if you can run fast enough you can breach between the worlds and land in a different frequency, which is what I have done and seem to be getting better at. Sort of. It's what Zoom's managed to do, who, might I add, I'm in no way affiliated with."

"Zoom. Yes, that is what he called himself. Would you by chance go by the name 'Flash', Mr. Allen?"

"Yes! How do you know?"

"Because that's what, or who it seems, Zoom has been demanding."

"And for someone who can run fast, he seems to be a somewhat-match for me," Kara suddenly spoke up, adding, "you know, flying too…"

"And heat vision, freeze breath and super strength. You like to punch," Barry added with a smirk. "Like I said: I come from another Earth and have literally come from a world where I already met Supergirl, been in the DEO, and even met the infamous Cat Grant." Barry tried to namedrop, hoping to convince everyone.

"Was she as infuriating on that Earth as this?" Kara asked, unable to help herself.

"More like self-centred, arrogant and yet somehow endearing. She was like a… well, a mentor to you," Barry pointed out, about to use a parental reference but with her foster dad and sister in the room, that would have been a bad move.

"You believe he is who he says she is, Miss Danvers?" Wells asked turning to her now; even on this Earth he didn't call people by their alternative names either, it seemed.

"Yeah," Kara smiled looking at Barry. "I do. At the very least he didn't mean to end up here, having literally arrived when I picked him up."

"In which case" Jeremiah stated, he having remained at the back, behind Wells, Alex and Kara, watching over events, "I trust that you won't put us to harm, 'Flash'?"

"I'll even willingly work with you to take down Zoom!" Barry pointed out, trying to be helpful.

"That maybe sooner than you think," Alex spoke up, she having been distracted the past minute or so as she moved over to the monitor on the wall. On Barry's Earth it was a simple on/off switch to access the cells in the pipeline; here it doubled as a television too, it seemed. Or at least a clever tablet.

'Blue Streak terrorises National City. Demands 'Flash' again' the banner on the news article read as Barry saw Zoom had about a hundred innocent citizens trapped in the large familiar park he'd recently fought Silver Banshee and Livewire in on the other Earth. Burning on the grass in large letters were the words 'Bring Me Flash'.

"Let me out" Barry voiced, his voice surprisingly level as his brain boiled in anger.

"We fight him together," Kara pointed out, Barry forcing his eyes away from the small monitor to look at Kara. Reluctantly he nodded.

"Together" he stated as Wells went to open the cell. Once out he held out his hand to Kara who took it in a handshake. It seemed that for the second time that day he was once again partners with Supergirl.

A/N: Hope you enjoyed! Next chapter: 'Zoom V SuperFlash'. Please REVIEW.