A/N: I do not own The Flash or Supergirl. Enjoy!

Barry Allen felt the pain radiating through his body as he slowly opened his eyes. The first thing he noticed was the night sky above him, the moon shining in his direction. He tried to remember the last thing that happened before he slipped into darkness, but remembering what happened wasn't as important when he slowly sat up and took in his surroundings. He was in an empty grassy field, and as he observed the damage to his suit, he realized there were some tears, but nothing too serious or revealing. He continued glancing around until he realized he couldn't see STAR Labs, he couldn't see the Central City police station. He slowly got up from the ground as he started to make his way towards the city with hopes of recognizing something. However, there was something wrong, something incredibly wrong.

He passed by the buildings but none of them were familiar. The usual coffee shop he went to with Dr. Caitlin Snow and Cisco Ramon wasn't there. The clubs that Barry had passed by and sometimes entered when the STAR Labs crew had some downtime weren't there. Not even the Central City News Picture building where his friend Iris West worked was in the vicinity. Instead, there was a gigantic building that had the words CatCo Worldwide plastered on the front and advertising on one of the gigantic billboards was a girl that was in a superhero costume, cleverly dubbed Supergirl. Barry had never heard of the superhero Supergirl, and his friend Oliver Queen, who was the Green Arrow in Starling City, never mentioned her. That revelation made Barry quite uncomfortable and for the first time in a long time, he felt like he was lost. He let out a small gulp as he noticed some people staring at him, prompting him to make his getaway out of here. In a millisecond, he was gone but he noticed the camera phones immediately coming out to take a picture of the red blur. They had never seen him before, and that was what frightened Barry the most.

"Where the hell am I?" Barry muttered to himself, trying to remember how he ended up in this crazy city in the first place. But he didn't need to remember what brought him here in the first place…

Zoom.

"I need to find something that makes me go faster." Barry paced while in STAR Labs, Cisco and Caitlin standing there with concern. "Zoom is out there and after he killed my father, there's a strong chance that he will be out there trying to kill again. The problem is, how do you defeat someone that is faster than you are?"

"Yeah, he kind of triumphs your whole 'Fastest Man Alive' schtick." Cisco teased, but Barry couldn't help but let out a groan.

"I don't care about being the 'Fastest Man Alive'," Barry said although Caitlin and Cisco didn't believe him. "Okay, maybe I kind of do. But the point is, innocent people are going to die if we don't stop him. Or worse, someone close to me...close to us."

"Barry, may I suggest that you relax. Zoom isn't going to attack tonight. I have an idea. Why don't you go on a date with Patty? I'm sure she'd like that." Caitlin suggested although Barry bit his lower lip. "Oh no, I know that look."

"That's the look of someone who doesn't have a girlfriend anymore," Cisco added. "Dude, spill."

"Yeah, I broke up with her," Barry admitted. "Do you know how hard it is to be a superhero and having your enemies know the thing that gets you weak at the knees? Imagine if Patty died at the hands of Reverse-Flash or...Zoom...or any other Meta-Human...and I wasn't there to stop it."

"So that explains why you kept Iris and Patty in the dark about your secret identity," Cisco smirked while grabbing a pencil and attempting to balance it on his nose. "Because you're afraid they're going to get hurt."

"Well, obviously Iris knows now." Caitlin pointed a finger at Cisco. "But the point still stands." Caitlin felt her expression soften as she stared at Barry. "Barry, you can't be afraid of getting close to someone every time trouble happens. You really liked Patty...and I'm sure she would have stayed if you had just let her in."

"I can't do it, Caitlin," Barry muttered, his expression appearing weak. "I can't let someone I care about die because of me. Remember what happened to Iris and Eddie…, she lost someone she truly cared about and I don't know how she moved on like that. I'm not strong enough to do what she did."

"Barry, that's not true." Caitlin softly said. "Just give it some time, okay? If anyone deserves to be completely happy in their life, it's you."

"Says the woman that lost her husband like ten million times," Cisco muttered, which caused Barry and Caitlin to glare at him. "Too soon?" Barry and Caitlin didn't have a chance to elaborate as the alarm went off, prompting Barry to stare with confusion.

"What's going on?" Barry asked. Caitlin went towards the computer and typed in a few words, her eyes widening as she glanced up at Barry.

"There's a bank robbery at Central City National Bank," Caitlin responded. "Be careful, though."

"I'm on it." Barry nodded his head as he immediately left the room. Caitlin glanced at the computer screen but there was something off.

"I'm not sure why but I can't shake the feeling something is wrong." Caitlin turned towards Cisco, noticing his face was scrunched up.

"Bank robberies happen all the time." Cisco reminded her. "How is this one any different?"

"I don't know…" Caitlin muttered, Cisco now staring at the computer screen alongside her.

Barry made it to the bank in under a minute but he realized while the alarm had gone off, there was nothing out of the ordinary. He sped towards the bank vault and realized all the money was still there, so he knew this wasn't just a simple robbery. Who could have pulled the alarm and not take anything?

"Barry, are you okay?" Caitlin said through the radio attached to Barry's ear.

"Yeah, everything's fine," Barry responded. "But that's the scary part. I don't see anything wrong. No one is being held up, and all the money is still in the bank. So I don't get this…"

"If nothing's wrong, it must be a false alarm," Cisco said.

"Yeah, probably." Barry sighed. "I'm going to head back to STAR Labs." Barry declared, but before he had a chance to move, he was knocked off his feet, which caused him to immediately land on the floor. Barry struggled to get up, but he felt someone's foot on top of him as he glanced up, realizing that the figure above him was his worst nightmare. "Zoom." Barry gritted his teeth while trying to inhale, but it was hard when Zoom's foot was on his chest cavity.

"Barry, is everything okay? Barry? Barry!" Barry heard Caitlin's voice come through the earpiece that was now on the floor. Barry tried to grab the earpiece but Zoom used his other foot to step on it, immediately cutting off Barry's communication from his teammates.

"So I see you received my signal." Zoom chortled, prompting Barry to grit his teeth. "I knew you couldn't stay away from trying to help your city."

"I should have known! What do you want, Zoom?" Barry sharply questioned, trying his hardest to get Zoom off him.

"Barry, you should know exactly what I want," Zoom said. "I want to rid of you, just like I did with your mother and father!"

"Please, with you and what army?" Barry chortled, but he didn't feel as confident when Zoom grabbed Barry by the neck and threw him into one of the booths. Barry hit the ground with a thud, immediately struggling to get up.

"You should know me, Barry," Zoom responded. "I don't need an army to defeat you."

"So you got me to come to a bank robbery call by myself, just so you could destroy me?" Barry smirked. "That's not going to happen."

"Oh, you don't know what I'm plotting. But the first part of my plan is to simply annihilate you." Zoom ran towards Barry and once again picked him up by the neck, throwing him to another end of the bank where Barry felt a sharp pain in his back. Barry screamed as he hit the floor, clenching his fists in an effort to control the pain. Barry tried to focus on getting up from the floor, but Zoom once again grabbed his neck and squeezed it, with hopes of cutting off Barry's air circulation. Barry tried to fight back with Zoom, but he felt himself becoming lightheaded, and eventually he was fading in and out. Barry eventually closed his eyes and the last thing he remembered was the powerful cackle coming from Zoom's mouth.

Barry sat near a nearby river, glancing at his reflection in the mirror. He had the marks on his neck from where Zoom had squeezed him, and he felt pain in his back as he remembered being thrown like a ragdoll all over the place. He didn't know where the hell he was, and he didn't even know how he went from being the bank to this field. He had to figure out where he was, but the problem was he didn't know how to do so if he didn't have communication with Cisco and Caitlin back at STAR LABS. He slowly got up and decided he needed to change his clothes, especially since he had to keep a low profile. Everyone was already suspicious about the red blur they saw in the city, and he didn't want to end up in the hands of the military or something. He had a feeling he was going to be in this city for a long time.

Kara Danvers flew through the air in her superhero costume as she grumbled to herself, unbelieving how disappointing her night had been so far. She had decided to go on a date with someone she met on a dating website, but the problem was he spent more time on his phone than talking to her. Kara couldn't help but feel a sense of relief that her sister called in the middle of the date, and it reminded her to never go out with that particular man again. As she made her way to the DEO building, she noticed her sister was waiting for her by the entrance, prompting Kara to give her a smirk.

"Sorry, I'm late and thank you for saving my butt." Kara chuckled while Alex smiled.

"Bad date?" Alex wondered.

"Terrible date." Kara scoffed as the two of them entered the building. "He spent most of the time on the phone, checking his fantasy football team. I wanted to pick the table up and clobber him with it."

"But that would have given away your secret identity." Alex reminded her. "And then you'll be the talk of the town tomorrow. Especially at work. And remind me again why you're using a dating website to find guys. I thought you and James were together?"

"I haven't told you? We broke up," Kara admitted. "We're still friends but...we decided it wasn't going to work out."

"Oh, I'm sorry." Alex gave a saddened look. "I thought you really liked him."

"I did," Kara admitted. "Well, I thought I did. I'm not really sure. Maybe it's just for the best. I don't want to put him or anyone else in danger."

"So you're willing to sacrifice your happiness to protect others? Kara, you deserve to be happy."

"I know, but how can I be happy when I'm running around with superpowers and all my boyfriends are weak against alien threats?" Kara reasoned. "Maybe it's for the best that I focus on work. And maybe when I'm done locking up all these aliens, I can get back into seriously looking for that special someone."

"Well, I hope you find that special someone," Alex smiled. "Whether he be human or alien."

"You know, now that I think about it, dating an alien would be kind of cool." Kara chortled. "At least they can protect themselves." Alex and Kara walked into the room where Hank Henshaw waited for them, standing in front of a large screen. "What you got for us, Hank?"

"Kara, glad you could join us." Hank gave a nod of his head while motioning towards the computer screen. "National City Police were notified of a threat running around the city limits."

"What kind of threat?" Kara wondered.

"Civilians spotted a red blur running through town. We're not sure if it's a threat or not, but you never can be too sure, especially with our luck dealing with aliens." Hank crossed his arms.

"Is there any way to focus in on this thing?" Alex pondered.

"We're working on it," Hank said. "But for now, we don't know."

"Could it be an alien that originally escaped from Fort Roz?" Alex asked again.

"No, it doesn't look like an alien from Fort Roz," Kara answered. "Not to my knowledge."

"How about Maxwell Lord? Do you think it's one of his creations?" Hank questioned. "He has been bent on trying to destroy Supergirl since the very beginning."

"Well, he's definitely on the suspect list but without concrete proof, it wouldn't be right to barge in and demand answers." Kara reminded him. "He has the power to turn the entire town on Supergirl."

"So what do we do in the meantime?" Alex pointed to the computer. "We don't know what that thing is."

"We have cameras set all over the perimeter," Hank responded, Kara furrowing her eyebrows at the computer. "We'll find this thing and then we'll bring it in for questioning. We don't know what it is...so we have to be cautious."

"There could be a possibility that it's not evil." Kara reminded him.

"Yeah, but with our luck, it might be," Alex smirked although Kara rubbed her temples in response.

"As much as I'd like to stand around all night, I have work in the morning," Kara said. "As long as that red blur doesn't cause issues, then it's for the best to let it be. In the meantime, we should try to find out its identity."

"Good idea," Alex said. "I'll have some of the staff work on it tonight and if we get anything new, we'll call you." Kara nodded her head as she made her way out of the DEO headquarters and flew off back to her apartment. She wasn't sure what intrigued her about the red blur. She was intent on finding it, and she wasn't going to stop until she got some answers. She wasn't going to let that red blur destroy her city.

"Are you able to get a signal on Barry's suit?" Cisco asked as Caitlin typed on the computer in STAR Labs. "He said he was coming back, he should have been back by now."

"I'm working on it," Caitlin responded. However, she became dejected when the computer couldn't ping Barry's location, causing her to lean back and shake her head. "Nothing."

"Something must be terribly wrong," Cisco replied. "It's not like Barry to say he's coming back and then never show up. We have to find him."

"And we will." Caitlin and Cisco were taken out of their thoughts when they saw Dr. Harrison Wells come towards them. "Like you said, it's not like Barry to just disappear without telling us, so that must mean either he was killed during the bank robbery or the bank robbery was simply a trap. Considering the Central City police haven't found anything to prove the theory Barry is dead, it's better to assume he was summoned there by an enemy."

"Okay, and that enemy would be?" Caitlin headed towards Dr. Wells as Cisco turned on the television. "Cisco now's not the time to watch T.V."

"I think you're going to want to see this," Cisco responded, Caitlin and Dr. Wells now heading towards the television. The three of them watched as they saw Barry's familiar red blur go towards the scene. But when they noticed a familiar blue one as well, and that was when they knew who summoned Barry to the bank. The fight between Barry and Zoom was on television but what startled Caitlin was Zoom running with an unconscious Barry, until they immediately disappeared. "This is going to sound pretty obvious, but I get a feeling Zoom is behind this."

"Okay, so Zoom summoned Barry, fought him and then carried him off." Caitlin sighed. "What happened to Barry, though? It's not like he could disappear into thin air."

"Or maybe he can…" Cisco responded, walking towards the computers and going through multiple files. "Zoom's speed can create ripples between different worlds, and I've been mapping them out for research. Something tells me that with Zoom's speed, he and Barry went into another world...or another Earth."
"And how many Earth's are there?" Caitlin wondered.

"Oh, you'd be surprised. There's one where MLK wasn't assassinated, where Al Gore becomes President, even one where Oliver Queen is dead and his father's alive." Cisco said. "Don't tell Oliver I said that."

"Too late." A gruff voice caught their attention as they noticed Oliver in his Green Arrow suit. Oliver never really came to visit, and if he did he was always searching for Barry. And with Barry AWOL, they were afraid they were going to disappoint the vigilante. "I know this seems like an impromptu visit, and I wish it was for pleasure, but one of your meta-human freaks came and destroyed my lair. I need to talk to Barry about him."

"Well, that's going to be a problem because we currently don't know where Barry is," Caitlin responded. "We're trying to figure that out ourselves."
"Wait, so Barry's in trouble?" Oliver walked towards Caitlin, trying his hardest not to show concern. "What the hell happened to him?"

"Long story short, he went to stop a bank robbery, and now we can't find him. It looks like Zoom dropped him off in a whole other earth and then came back to give you a nice message." Cisco answered.

"Zoom?" Oliver appeared muddled. "Get me up to speed. I'm not familiar with all of Barry's enemies."

"He was blue, right?" Cisco got up from the computer while Oliver nodded his head.

"Yeah, and he was fast like Barry," Oliver answered. "So you're saying that Barry's not here...on this Earth."

"Yes, and the worst part is we don't know where he could be." Caitlin sighed. "He could be anywhere."

"Okay, here's an idea, let's go find him," Oliver said.

"Easier said than done." Cisco clicked his teeth before giving the vigilante a meek look. "Zoom was able to get Barry to a whole different world because of his speed. None of us are fast enough to go into another world, let alone find Barry."

"Okay, but there has to be something we can do," Oliver said. "Maybe there's some machine that we can use to mimic Barry's speeds so we can search for him."

"Well if there is one, it wouldn't be here," Caitlin said. "And we don't have that type of technology." Oliver thought for a moment as he nodded his head, staring at Caitlin and Cisco with interest.

"I know where we can get that type of technology," Oliver revealed. "Looks like we're going to Starling City…"

Barry entered a coffee shop the next morning as he glanced around at the people talking. Luckily before he took a walk through town, he found a plaid shirt and mustard yellow pants on a clothes hanger, thinking that the person wasn't going to mind that he borrowed them. Barry walked to the table and sat down, glancing at the currency that the people in this city used. Luckily for Barry, the money was the same. He raised his hand as he waited for the waiter to come, the waiter eventually arriving and giving him a warm smile.

"What can I get you?" The waitress wondered.

"Let me get…" Barry was about to order until he noticed one of the drinks on the menu. "Um, what's a Supergirl?"

"Oh, it's named after National City's superhero, Supergirl." The waitress said. "It comes with mocha coffee, whipped cream, drizzle and it's topped with donuts."

"Sounds like diabetes in a cup." Barry quipped. He took out a $5 and handed it to the waitress. "I'll have one of those."

"Perfect. I'll be right back." The waitress grinned, heading towards the register to get Barry's order. As Barry leaned back in his chair, he glanced around the coffee shop. So far, everyone looked the same as him, so he knew he was still on Earth. He just wondered why everyone was talking about a superhero that he ever heard of before...and how did he end up in a place called National City.

"I'll take a Supergirl along with Cat Grant's breakfast order." A voice forced Barry out of his thoughts as he noticed a young girl by the counter, and Barry would have been lying if he said she wasn't pretty. Maybe the girl would know who the heck Supergirl was...or where he was. He got out of his chair and walked towards the girl, tapping his hand on the table with a smile.

"I see you ordered a Supergirl too." Barry noticed the girl staring at him with a small smile. "Isn't it odd drinking something with so much sugar in the morning?"

The order is for my boss." The girl widened her grin. "She usually goes for a latte, but she decided to have the newest coffee drink inspired by National City's hero."

"Supergirl?" Barry blurted out, causing the girl to nod her head.

"Yeah, Supergirl." The girl couldn't help but chuckle as Barry rubbed the back of his neck. "You know, you act like you've never been here before, considering Supergirl is like the superhero."

"Well, this is my first time visiting," Barry said, and there was definitely some truth to that.

"Well, you're going to like it here, I promise." The girl assured him. "How long are you staying?"

"Oh, I...I wish I knew." Barry truthfully answered. "I hope it's not a very long visit but I guess I'll have to make the most of it. What do you recommend I do while I'm here?"

"Well, there's a few cool ice cream places, a couple bars, A Chinese restaurant down the street, but my favorite is the donut shop across town. They make the best donuts." The girl giggled until she realized she was getting excited over a donut.

"Well, I love donuts too. I think that's why I ordered the Supergirl, because of the...donuts crumbled on top." Barry chuckled while the waitress came and handed both Barry and the girl their orders.

"Have a good one, kids." The waitress winked before walking away, Barry wondering why she had done such a thing.

"I think she thinks we're together." The girl answered almost as if she was reading Barry's thoughts. "Well, um...that would be extremely hard considering I don't know anything about you, let alone your name."

"Oh, right. Um, I'm Barry Allen." Barry held his hand out for the girl as she shook it in return.

"Kara Danvers," Kara said, Barry smiling at her. "Well, I hope you enjoy your stay in National City. Unfortunately for me, I have to head to work and get yelled at by my boss all day."

"She sounds peachy." Barry wrinkled his face as Kara laughed.

"Yeah, she's...a dream." Kara grabbed the food that was nearby and waved at him. "See you around."

"Yeah." Barry nodded his head, but as Kara was about to leave, Barry bit his lower lip. "Kara."

"Hmm?" Kara turned around and raised an eyebrow at him.

"Well, since you were telling me about superheroes and...Supergirl...um, are there any other superheroes here?" Barry questioned.

"Like...?"

"Um, like The Flash or Green Arrow, Black Canary…" Barry shrugged his shoulders as nonchalantly as he could.

"Who?" Kara raised an eyebrow. "I've...never heard of them."

"None of them?" Barry widened his eyes.

"No…" Kara was beginning to get suspicious of him but she decided to downplay it. "Um, the only superhero I know of besides Supergirl is her cousin Superman and he's in Metropolis."

"Right, right. Um, sorry it's just that where I come from, we have The Flash and Green Arrow." Barry reasoned. Kara was about to question it until she heard her phone go off.

"Oh, I better go." Kara pointed towards the door. "Well, I hope you enjoy your stay in National City. Who knows, you might run into Supergirl or Superman while you're here." Kara turned around and left the coffee shop, but Barry suddenly felt his heart drop. If Kara didn't know who The Flash was, then that was a problem…

Because he was now certain that he wasn't on his Earth anymore.