Hello, my lovelies! How are ya' all doing? So, yeah, you may be wondering, like; "A crossover between Flash and Lab Rats? The heck?" And yeah, I know what you mean, lol. This was seriously such a daunting idea to me, it took me forever to build up the courage to do it. It's not gonna' be perfect by any stretch of the imagination, but at least it'll hopefully be a worthwhile read. ;)

I'm such a big fan of the Flash and Lab Rats, so I've actually kind of always wanted to do one, but never thought that I actually could. If only I could somehow include the rest of DC and Marvel; then I'd be set, lol. ;D So, in case you're wondering what the origin story of this story is, ;), I have to give some of the credit to my brother. *sighs*

I know, I know, why can't I just be original for once? ;P Anyway, we were watching "Back From The Future" of Lab Rats, and a wild theory popped into my head, and my brother and I just took it from there, and thus this was born! So, basically the theory, and canon for us, ;), is that; the Lab Rats stopped the particle accelerator on their earth (the one we all know and love ;P), but on every other earth, they failed to stop it, weren't there to, etc. So, yeah...that's basically it. And if you want to know more, you just have to read the story. ;D

Now, this is gonna' be kind of AU. First of all, let's discuss why it's AU in Lab Rats: this takes place after "Rise of the Secret Soldiers", and basically Mighty Med doesn't exist in this one, and neither does the Bionic Island and students and such. And, also, because it's a crossover with the Flash, lol.

Now, let's do the Flash (this is gonna' take a while): Barry's back has been broken, and they haven't defeated Zoom yet, but Jesse has been rescued and they've been to Earth 2 and all that. Cisco has his Vibe powers, so he can open breaches, and also, it's a crossover with Lab Rats, so...

I don't think that there's anything I'm missing; please point it out if there is! And at the bottom of this chapter, I'll explain who each character is, and what they are to each other. I'll do that with each chapter when there's a new character for each show, so if you're new to Lab rats, just wait a couple of chapters because that's when they come in. But don't just skip these first couple of chapters if you're a Lab rats fan; each chapter is important! That goes both ways. ;)

Also, I would suggest looking things up about the opposite show of what you watch, so that you can understand things a little bit better. Also, again, if you want to know what each one looks like, they're will be some of the characters in the picture for this story. And in the future of this story, the 'selfie' that Barry and the rest of the team took in season one, is the picture on the top left of this' story's picture...does that make any sense? I don't know, this is just getting really long, haha.

So, just wondering, if you're a fan of both shows, feel free to let me know! ;) I just want to know if there are any others out there like me! ;D So, after that EXTREMELY long AN, we are now onto the story! ;D

Disclaimer: I own neither of either shows...*raises eyebrow* Does that even make sense..?

They had seen it a fraction of a second too late.

But for a speedster that was more than enough time for it all to go down.

They had simply been at Star Labs, discussing their next move to attack Zoom. It had seemed like a normal day. Little did they know what it would lead them to...

...

"So, I've been working on this tracker," Cisco began, walking into the room; one hand clutching at his tablet, while the other waved around for extra emphasis.

Barry and Caitlin both glanced away from the monitors and towards Cisco for a moment, while Harry continued to study something on the computer; still listening to Cisco even though he was currently typing on the keyboard.

"It should work with him, we'd just have to get close enough to him to actually shoot him with it." He explained and Barry nodded as Cisco handed him the tracker. He studied it for a moment, before frowning and looking up at Cisco.

"It looks like it can just be injected." Barry stated and Cisco nodded.

"Mm-hm, but I mean, how are we possibly going to do that?" Cisco asked, rhetorically, before moving over to one of chairs and sitting down in it. "I figured that this way, we can just shoot him with it, make him believe that it's another tranq, and then boom, we know exactly where he's at, any time." Cisco said, the smile on his face not hiding any of the joy of his accomplishment.

"Yes, but there's a flaw with that plan, Ramon." Harry began and Cisco groaned and muttered 'there always is'; earning an amused, shared glance by Barry and Caitlin. Harrison was oblivious to it all; rather or not it was purposeful, undetermined to the others.

"Suppose Zoom should find out about the tracker? He'll come here, and end us all right away, not even bothering to get rid of the tracker, because guess what? Nobody is there to see it." Harry said, the usual look of seriousness on his features. After a moment of hesitation, Cisco shrugs.

"Let's hope he doesn't find out then." He says and Harry rolls his eyes, turning back to the computer.

"What are we going to do until then, Cisco? I mean, I can't just go and fight them; we both know how well that worked out last time." Barry said, hand subconsciously clenching around the tracker in his hand at the mention of his previous, failed attempt at stopping Zoom. The whole demeanor of the room suddenly changed from lighthearted to dead-serious.

"We're going to have to stall. Wait until we do have a plan." Harry said and Barry sighed.

"We can't do that. Do you know how many innocent people will die in that time? How many more lives will be lost until we find a plan?"

"I know that, Allen, but we have to have a plan this time, and not run in blind again." He said, the frustration evident in his voice. "Or else this time when you fight him there's going to be a much different outcome. A much worse outcome." Harrison declared, not bothering to mention what could and would happen.

"What about-" Caitlin started saying, the first thing she had said in a while, when suddenly, the lights started dimming before flickering.

"Cisco?" Barry asked, his voice calm and quiet as he took a step away from the desk and look up at the lights. He was wearing his suit, as he had just gotten done training, and prepared himself to have to put his mask up in case it was an intruder.

But they all shared the same fear that it wasn't just any intruder. The lights suddenly went out as sparks flew, and everyone ducked from the small, shooting embers; each one of the them feeling the same dread as they felt the sudden chill in the air.

Zoom was here.

"The whole system has been shut down from an unknown source." Cisco suddenly paused, looking up at them, his face paling at the realization. "Zoom is in here. He's in the building." He declared, and Barry's jaw clenched.

But then suddenly, before anyone could even see what was happening, blue lightning crackled through the air as the black shadow raced into the room. Nobody had anytime to react.

They were all too late.

The last thing they saw, was blue electricity crackling right in front of them, before suddenly it was gone. And the red cladded hero standing next to the desk, had vanished along with it.

"Barry!" Caitlin shouted, eyes widening in horror at the vacant spot next to her.

"Oh no, oh no," Cisco muttered under his breath, hands coming up to the sides of his face. Suddenly, a loud beeping sounded off in the otherwise silent and pitch dark room, as Cisco's tablet began to light up; one of the few things not shut off by the electricity going out.

He immediately grabbed it, while Caitlin still looked out at where Zoom had gone, terror filling her, and Harry looked up at Cisco, anxious as to what the noise was.

"Holy..." His voice trailed off as he watched the bright red dot beep all around the map on his tablet. He looked up at the others, who were now both watching Cisco in identical shock and curiosity. "It's the tracker...it's in Zoom." Cisco stated, shock in his voice and Harrison immediately stood up.

"What do you mean the tracker is in Zoom? How do you possibly know that?" He asked, the impatience in his voice undeniable.

"Look at the dot! Barry must have injected him with it so that we could find him," Cisco said, the internal pride for Barry's ingenuity showing slightly on his face.

"How do you know that's even Zoom? What if it's Barry?" Caitlin asked, her voice shaking slightly and Cisco immediately pointed to the rapidly increasing numbers at the top of the screen.

"Look at that speed; Barry's no where near that fast yet. It has to be Zoom." Cisco said, a thought suddenly dawning on him. "Barry was wearing his suit, wasn't he?" A nod from Caitlin. "Then that means that we should be able to track his vitals right here on this tablet." He said, bringing up his vitals to prove his point. "See?"

"His vitals are only showing minor damage; I'm guessing from Zoom dragging him around. Not to mention his heart rate increase. He wants him alive, otherwise he and everyone of us would be dead right now."

Harrison declared and Cisco swallowed nervously, even though he felt a hint of hope take root in the pit of his stomach. At least Barry was alive and they could track Zoom. That gave them a fighting chance.

"Wait, what's he doing?" Caitlin asked, pointing at the, now still, dot and Cisco frowned.

"He's creating a breach." Harrison stated, realization dawning on him. "That's why his speed is still high, but it appears that the dot, AKA Zoom and Barry, is not moving." He declared and Caitlin frowned.

"Cisco, can your tracker still work if he goes to other earths?" Caitlin asked, the worry in her voice evident. She couldn't lose another friend to Zoom. Cisco nodded.

"I made sure to create the tracker so that it would, but it has never been tested, so I'm not sure if it will or not."

"What's that?" Caitlin questioned, pointing at the new blinking letters and numbers at the top left of the screen.

"E-13...that must mean Earth 13. Zoom has taken Barry to that earth." Harry stated and Cisco frowned.

"Wait, why would he take him to Earth 13? I thought he lived on Earth 2?" Cisco questioned and Harry sighed.

"A speedster can travel to any earth out there, and if Zoom wants to make sure that we don't follow him, then why would he go to Earth 2? He knows that that is exactly where we'd look for him. So he took him to Earth 13 to take us off of his trail." Harrison said.

"But why does he want Barry? Why now?" Caitlin asked and Harry sighed as he shook his head.

"I don't know."

"Well, let's find out." Cisco declared. "We have the experience. We have the technology, so let's just go to Earth 13!" Cisco suggested and Harrison sighed.

"We can't just go to Earth 13. We need a plan, Ramon. We don't even know for sure that he's going to keep Barry there. We don't just rush in blind and get everybody killed. Barry nearly died the last time we did that with Zoom, and he has superpowers, Cisco. We don't. You have Vibe powers, but that's it."

"No super healing or anything. So unless you want to get killed, we need to formulate a plan." Harrison declared and Cisco sighed; knowing that he was right. But still not giving up on his friend that easily.

"So, what, we just sit here, thinking of a plan, while Barry is out on some other Earth, God knows where, possibly getting tortured to his death as we speak?" He asked, voice firm with aggravation.

"Oh, no, Ramon. We're going to Earth 13." He said, much to Cisco and Caitlin's surprise.

"But we are not going after Zoom immediately. We'll get to know about that earth a little more, and we'll learn what it's like, the way people act and dress, and make sure that we adapt to it so that we fit in and don't stick out like a sore thumb."

"We'll learn about the particle accelerator and see what their Flash is like, and try and persuade him to help us." He stated and Caitlin and Cisco both nodded slowly.

"But what if we can't get their help?" Caitlin asked and Harry sighed.

"Then we move onto the next plan."

"And that is?" Cisco questioned, and Wells turns his head towards him.

"I don't know. But we'll figure it out. Now," He paused, looking at each of them individually. "Who's ready to travel to Earth 13?"

Wow...I just realized that the AN was almost as long as the entire chapter! XD Down below is the 'summary' for each character.

Barry Allen: Barry is the Flash; a superhero who was struck by lightning that originated from a storm created by a particle accelerator explosion (hang in there, it'll make more sense. See, this is why you should research this yourself ;)), sent into a coma, and gained super-speed from the whole ordeal. Because of difficulties at the hospital where he was comatose at, he was thus sent to Star Labs, where Caitlin and Cisco took care of him until (and after) he woke up. He has had a traumatic childhood, and would be about 26 in this story. (I think, lol) He works as a CSI at the CCPD. (Central City Police Department)

Caitlin Snow (Dr. Snow): Caitlin is a scientist and bio-engineer, who works at Star Labs. She is the Flash's 'doctor' and treats all of his injuries. She lost her fiancee due to the particle accelerator explosion, and her career was ended by it. She was slightly bitter towards the world, until she started to help out the Flash along side Cisco Ramon.

Cisco Ramon: Cisco is an engineer who works at Star Labs, and helps design technology for the Flash, and is excellent with a computer. He, also, lost his career oppurtuniities when the particle accelerator exploded, but has kept a more jovial attitude. He also has super powers, and he has the powers to to manipulate the vibrational energy of reality.

Harrison Wells: Harrison is a genius and scientist who is also the owner of Star Labs on Earth Two. (that'll make more sense in future chapters) He met with "Team Flash" when his daughter was captured and taken hostage by Zoom. He never really got along with anybody, until they began to understand each other more. He is a widower, with only one child.

Zoom: Hunter Zolomon, "Zoom", also has super-speed, from the particle accelerator on Earth Two. He is from the same Earth as Harrison Wells, (shown above) and has had a childhood very similar to that of Barry Allen's. Which he uses to try and constantly prove that he and the Flash is the same. He is a super-villain, of course, and his story is rather complicated. As is everyone else's.

I would suggest going to Wikia and searching each new character, but to each his own. ;) Please let me know what your thoughts are and I'll love ya' for life! ;)