Hello to all and welcome to the first chapter of my crossover fic! This is not my first fanfiction ever, but it is my first on this account. Please excuse any typos. Now, keep in mind that this takes place during season one of all of the shows included, and before Zatanna and Rocket join the team. Also, I haven't watched that much of Supergirl or Arrow, so don't put hate on me if my facts are a little off. And I KNOW that Supergirl and Arrow/Flash DO NOT take place in the same universe, but for the sake of this fanfiction they do, okay? Okay.

Disclaimer- If I owned Young Justice then there would be no time skip and Nightwing and Batgirl would have been a canon couple. Plus season three would be out long before now. If I owned Arrow Oliver would have been a teensy bit less antisocial. If I owned The Flash, Ronnie and Eddie would not have died and Iris would have discovered Barry's identity in a much cooler way. If I owned Supergirl, I would have… I dunno what I would no but I would make it better!

Word Count: 873

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Prologue

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The Flash was running. Now, he was usually running, being the Flash and all. But he was about to be late for a meeting with two other superhero/vigilante friends of his. As he arrived at the café, he realized that he was the final one to arrive.

"You're late." The blonde woman stated. "I don't get it, you can run faster than the speed of sound, yet you're late."

"It's just how Barry is." Said the man next to her, who had known the Flash for longer. "You'll get used to it eventually.

"Yeah, sorry about that guys." the Flash said, shaking his head. "I'll try to be earlier next time, I promise."

They made quite the friend group, though it didn't seem that way from the outside. Just Kara Danvers, Oliver Queen, and Barry Allen. The intern, the millionaire, and the CSI. But, more importantly, they were Supergirl, Arrow, and the Flash.

"So what have you been doing, Kara?" Barry asked.

"Not much. Just the usual things. Getting coffee for Ms. Grant, stopping the occasional alien. In all honesty, not much has been going on." Kara replied with a shrug.

"Yeah, same here. Cisco hasn't detected any metas recently and Captain Cold has been quiet. But it does mean I can relax."

Oliver turned his head to the speedster.

"Never relax, Barry." he said, seriously. "In the hero business, something will always happen that will disrupt your life, no matter how quiet it's been."

As usual, the other two snorted at his paranoia. As superpowered individuals, they didn't really get Oliver's struggle. While they had their speed and flight and strength and laser vision, he relied on human abilities, which caused him to be… serious, most of the time.

"Oliver, please." Kara told her friend. "Just because we finally get some leisure time doesn't mean something will magically come along to ruin it."

"Don't be to sure. Someth-"

The archer never got to finish his statement as they were immediately sucked into a vortex. Oh, Oliver had been so right.

~This is a breakline, yes it is. Breakline, breakline, breakline!~

The Team didn't really have much going on. Batman hadn't given a mission for the past two weeks, and things at the mountain were starting to get boring.

"Urgh, nothing's happening!" Wally, a.k.a. Kid Flash, groaned.

"You should not wish for a mission, Wally." Kaldur scolded, peering at him. "Do do that is to wish for a villain to make a move. You are asking for a disturbance in the peace."

"He's right, Baywatch." Artemis said, looking annoyed at the speedsters whining. "I'm sure that somewhere, there are heroes that are enjoying their relaxation time, and here you are wishing it away."

However, his teammates' arguments did not stop his boredom. He simply turned to the Zeta tubes, waiting for someone to walk through.

Recognized, Flash 04

Wally's prayers had been answered. He raced to greet his uncle.

"HeyUncleBarry!Whyareyouhere?Doyouhaveamission?" he asked, blending his words in a way that only a speedster can understand.

"Calm down, Kid." the Flash replied, chuckling at his nephew's eagerness. "I'm going to be testing out a new teleportation device and I wanted to know if you guys wanted to come watch. I know you haven't had a mission in a while, so its not like you've got anything better to do."

"What is the purpose of the experiment?" Aqualad asked, standing up.

"It's supposed to be a test of some upgraded Zeta tech. We want to make sure it's safe before we stick people through it, right?"

"New League tech? Count me in!" Robin said from his place in the rafters. He dropped down, making Kid Flash jump.

"I'll go!" Miss Martian agreed. "Conner, do you want to go?"

Superboy just grunted. They took that as a yes.

"I guess I've got nothing going on." Artemis shrugged.

"I f my team goes, I shall go." Kaldur responded, walking over to where the Flash was standing.

Everyone turned to Wally, awaiting his response.

"Urgh, I guess I'll go." He groaned, still disappointed at the lack of a mission. They headed through the Zeta tubes, leaving for the Watchtower.

~breakline is what this is so just scroll right on past it, folks.~

The machine itself didn't look that impressive, but the Team knew a lot of work had gone into making it. They gathered around, along with the founding members of the Justice League.

"Okay, are we ready to turn this thing on?" the Flash asked the surrounding people.

"Just do your job, Flash." Batman growled, crossing his arms.

The Flash gulped, and flipped the switch to the device. He stepped back, not wanting to be close to it in case it exploded. That had happened before with one of his inventions. It was not pretty.

All seemed to be going well until the alarms started going off.

Warning, unknown energy impulse detected. Warning. Said the robotic voice from the speakers.

"Turn it off!" yelled Superman, backing up.

Suddenly, a vortex opened up next to the device and spit out three people, all unconscious.

The vortex disappeared, and the League and the Team looked around at each other.

"Well I guess we have something to do after all."

There it is, the first chapter of my Arrow verse/Young Justice Crossover. Hope you like it! Please review; I welcome any feedback of any kind.