A/N: Hey all! This is Aurum. Fidei! SOO this is gonna be a mega crossover that contains all the shows characters :) but it focuses on a Barry and Kara friendship! I am trying to stay as cannon as possible but I am sorry when it comes to my fanfiction I live in a bubble where Laurel does not die :) because she shouldn't have died. Also when I say cannon I mean couples and such… be aware characters are bound to be OOC!

Kara was TIRED! She had taken down 3 hostile aliens today as well as followed a story that she just knew Snapper was going to LOVE! But right now? She was just simply exhausted. She wanted to collapse on her couch eat pot stickers and pizza and watch trashy television. Because you know what? Even Supergirl likes Keeping Up With the Kardashians.

Kara did not get very far, because as soon as she sat down on her couch she heard a loud beeping coming from her room. When she went to investigate she discovered that her trans-dimensional communication device that Cisco had given her was currently going off. She picked it up with a sigh not looking forward to having to assist her friends on a mission.

"This is Kara, what can I do for you?" She answered the device.

"Kara!" she recognized Caitlin's voice immediately "So glad we got ahold of you! Listen we wanted to ask a big favor."

"Well it's not really a favor… It is Barry's birthday tomorrow and we wanted to do something special for him so he knows we all forgive him for Flashpoint. And we know how much he enjoys it when you are here…" That was definitely Cisco

"What they are trying to get at is: Would you like to come to Barry's surprise party Kara? No mission here just some fun with all us here on Earth Prime." Iris got to the point

"Sounds like fun! When should I come?" Kara was excited to see her friends from another dimension.

"The party is tomorrow night so maybe tomorrow afternoon? You can help us set up STAR labs!" Caitlin said

"Sounds perfect!" with that Kara turned off the device and began to collect her things, she had a shopping trip to make in order to find a proper gift for Barry.

Next Day

The day seemed to drag by for Kara, but, soon enough it was time for her to go back to her apartment. And as soon as she was back in her apartment she quickly changed from her work clothes into a bright green dress. She left her hair down and adjusted her glasses as she grabbed the envelope that contained Barry's birthday present (a gift card to a donut shop here in National City, so He would have reason to come and visit her) before grabbing the device that Cisco had given her. She took a deep breathe before creating a portal and stepping through it.

As soon as Kara was on Earth Prime she was engulfed in the hustled and bustled that was STAR labs. Iris, Cisco, Joe, Wally, and a blonde man she did not know were currently busy hanging streamers and setting up a table that was loaded down with all sorts of food. Caitlin was sitting at the computers. Kara walked towards her not wanting to interrupt anyone else.

"You all seem like you have a handle on this… Where should I put this?" Kara asked Caitlin as she held up the envelope she had in her hand.

"Kara! It is so great to see you! And right over there on the table next to the food is fine!" Caitlin had hopped up from her seat to embrace Kara. "I am just keeping busy by occupying Barry with stopping small crimes around the city while we set up" Caitlin grinned as she sat back down and flipped her comm on "Barry there is a robbery going down three blocks from you right now. Suspect is armed."

Kara laughed as she took her small gift and placed it on the table that was for the most part empty save for a small gift wrapped box and another envelope.

At that moment Oliver Queen and company walked in.

Thea Queen walked straight at her and hugged her tightly "Been a while, Girl of Steel, glad you could come to our Earth for such a neutral thing!"

The action surprised Kara, but being a hugger she responded eagerly and said "Well, anything for Barry."

"Do NOT let him hear you say that!" Iris said from her spot at the top of a ladder. She was busy hanging red and yellow streamers from the ceiling of the cortex. "He will get it in his head that he can call you whenever and for anything!" Iris was reaching and attempting to hang the streamer in a place that was just out of her reach and lost her balance. Kara shot up off the ground and rebalanced the other woman on the ladder before taking the streamer from her. In green blur the cortex was decorated in the Flashes colors. Kara then gently floated back down to the ground where her Earth Prime friends were all looking at her in awe.

"What?" She said before she grabbed a sandwich off the platter that Felicity was holding.

Before anyone could say anything a voice was heard from the hall. "OK, Barry, what the hell? Gideon is saying there is a disturbance of some sort here and that we needed to check it out! Something about a breach?" Sara rounded the corner, she looked casual with jeans and a grey flannel on she was quickly followed by the other legends.

Everyone lit up at the sight of their time traveling friends. Laurel seemed to be the happiest of the bunch.

"Sara!" Laurel burst forward to embrace her sister. The two rocked back and forth as they laughed at being reunited. When they separated Sara scanned the room, she locked eyes with Kara.

"Kara Danvers. I am going to take a wild guess a say you are the disturbance." Sara grinned at the kryptonian "What are you doing here?" Kara gestured to the party around her and said "Its Barry's birthday. Cisco, Caitlin, and Iris invited me to come. Something about having some fun with my Earth Prime friends without a mission."

"Speaking of Barry, We have incoming in fifteen seconds! Everybody hide, NOW!" Caitlin said from her spot at her computer. She promptly ripped her comm out of her ear, switched the cortex lights off, and ducked underneath the desk.

The legends quickly caught on as everyone scrambled to find a hiding spot. Kara smirked to herself as she watched her friends rush about to hide. When she heard Barry coming into the building she launched herself into the air so that she could hide up by the ceiling.

A gust of air was felt by everyone when Barry flashed into the room. "Hello? Guys?" He called out into the dark room

"SURPRISE!" Everyone jumped-or in Kara's case levitated down- out of their hiding places as Caitlin switched the lights back on.

Barry did not know where to look. It was funny the way his head turned into a blur as he attempted to take in his surroundings and the fact that most of his family and friends were here.

"WOW! Everyone… wow. I can't believe you are all here! And Kara! You traveled the multiverse just for my birthday?" Barry had taken down his cowl and was stepping towards his friend from Earth 38.

Kara lightly landed on her feet before crashing into Barry. She had really missed her friend. "Of course! But you should be thanking Iris, Cisco, and Caitlin. They did everything. Including getting me here which brought Sara and her team."

Barry looked to his girlfriend and two best friends who were all grinning. "We have been planning this for a few weeks now. I coordinated with Felicity to get all of Team Arrow here. It was Iris' idea to call up Kara." Caitlin started before turning to Iris.

"We know you haven't seen Kara since the Dominators and you two are such good friends and plus we thought it would be fun to see her on neutral ground. Although I am still slightly unclear on how Kara being here got Sara and her team here." Iris smiled before she hugged Barry and kissed him lightly. She looked at Sara to explain the rest.

"Well we were just in the temporal zone not much going on right now… But Gideon detected a disturbance and thought we should check it out. She also said something about a breach. I am simply concluding that we only had one breach open today and that was for Kara to come here." Sara explained from her spot next to her sister and Oliver.

"Well I am just glad to be able to see you all again!" Kara was grinning as she yet again pulled Barry into a hug (that happened to include Iris as well)

"It is good to see you too Kara" Barry returned the hug halfway as he still had one arm around Iris.

"Well what are we waiting for? Lets get this party started!" Cisco said as he turned on some music and began dancing in his place behind the desk.

Everyone laughed as they all began to relax and mingle amongst each other. The food was enjoyed and everyone soon began dancing with one another. There was definitely some humorous pairings for dance partners. Mick refused to dance but Sara resolved to dance around him in order to irritate him. Kara ended up dancing with Curtis as he reminded her of Winn. Laurel had switched between dancing with Rene and Cisco. Caitlin was laughing as she danced with Thea Queen.

It was Kara who broke out of the group to go and grab her gift for Barry. She rushed to him in order to shove the envelope in his hands. "Open it!" She exclaimed

Barry proceeded to flash the envelope open knowing that Kara would be impatient. "Wow Kara! Thank you! Now I have a reason to come to Earth 38 sometime and visit you. Maybe this time I can meet your sister?"

"Yes! Alex will love you! She is also dating this detective, Maggie, She is great as well! You can also see Winn and James and meet Mon-El!" Kara was buzzing with excitement.

"Sounds great! Maybe I can come sometime next week? Iris can come too!" Barry said as he pulled his girlfriend closer.

"I would really like that! I would like to meet Team Supergirl" Iris smiled

"Just don't call them that." Kara laughed

And with that Barry began to open his other gifts. The rest of the night was filled with laughter and good times between friends. It was all too soon when Kara needed to return to her world. She began making her rounds hugging her friends. Everyone was shocked when she even gave Mick a hug.

"I really had a lot of fun today! Happy birthday Barry!" She said as she hugged Barry.

"It was fun. We need to meet up on neutral ground more often. And really thank you for coming and for the gift. Iris and I will be in contact about when we can come and visit." Barry responded to his friend as she got her multidimensional portal device out of her pocket.

Kara waved at all her friends before creating a portal and stepping back into her home world. It was a good day.

A/N: Hope you enjoyed it! Please read and review!