Alright so here's the explaination I promised you in the prologue.

1. This story is a little more based off the Avengers Movies and the Disney XD show Avengers Assemble. Most choose Earth's Mightiest Heroes to use these kinds of crossovers, but it's been forever since I saw Earth's Mightiest Heroes so yeah.

2. So I bet you're all wondering about Ultron, right? Well I'm still working on that one. My big plan is that a Mystery person found him and allowed him to put himself back together. Afterwards he supplied the resources Ultron needed.

3. Yes Future Tony and the others come in in time.

4. This fanfic will focus mostly on the kid so if I seem to go into a little more detail with him forgive me.

5. This takes place about 2 years, maybe a little more, after the kids had defeated Ultron.

6. This is more of a filler chapter. Like the calm before the storm type thing.

7. R&R
So there ya go. explaination achieved. If you have any questions just leave them in a review or pm ok?

now enjoy!

Chapter 1: First Encounter
A base ball knocked over a bunch of bottles.
"Yes! Tenth time in a row!" A man with dirty-blond hair, blue eyes and purple sunglasses said as he was handed a stuffed bear that he added to the pile of the exact same bear.
Another blond haired man shook his head at his friends efforts. His eyes were also blue. He had on a blue t-shirt and jeans with black shoes. A red, white, and blue shield with a star on it was strapped to his back.
"Is this all you do when you come here?" He asked the sunglass wearing man who had on a black t- shirt, jeans, and black and white tennis shoes.
"At least I didn't bring my work with me," Sunglasses pointed out before setting himself up for another round of the game. Shield shook his head.
"Fair enough, but if there's one thing I learned it's that Avengers never have a day off."
Not far from them the very same boy who had stepped into the portal was standing there. He had a hologram on that displayed civilian clothes so he could better blend in. A pair of red glasses allowed him to see the two Avengers with optimal zoom and a device in his ear granted him the ability to hear their conversation.
"Sure we do. It's what we're on right now. So relax will ya?" He heard Sunglasses say. "Try to have fun." He made his red teched-out glasses zoom in on and scan Sunglasses.
Running scan…
DNA Match Confirmed.
Designation: Clint Barton a.k.a Hawkeye
"Explains the aim," he muttered and adjusted his glasses to scan Shield.
Running scan…
DNA Match Confirmed.
Designation: Steve Rogers a.k.a Captain America
He paused, the conversation they were having seemed to fade from his attention. He simply stood there and stared at the man who was his confirmed target. Part of him, a very small part, was happy and panicked at the same time. The other part of him, which took up about 75% of his brain, was satisfied in a crooked way since his master would be pleased. He allowed a smirk to cross his features briefly before letting it disappear. He strolled casually towards them, humming a soft tune and avoiding the people in the crowd with ease. Captain America noticed that he was coming towards them and could almost sense that something was wrong with the kid. Yet something seemed familiar about him. Steve pushed that aside and tapped Clint on the shoulder as the man was about to throw another ball. Clint looked at his teammate who pointed to the kid, who was much closer to them now.
"Mind if I try?" the kid's voice still monotone, but this time it had a hint of cockiness. Clint looked him up and down before smirking.
"Sure kid," the archer consented and tossed him the ball. "First one's on me." He caught it with ease and took his place next to Hawkeye, his glasses calculating the exact distance, force, and trajectory the ball needed to be thrown. Steve was observing him and he knew it, but Clint didn't seem to notice anything about the kid. "Don't be to upset if you don't get it. Not everyone can have as good an aim as I do." the archer said with a cocky smirk. The boy only smirked back and Steve noted how this smirk was considerably dark and malicious, even if it lasted for only a second, and it sent chills down his spine. The boy, as if to just take Barton down a notch, took a few steps back before throwing the ball, knocking the bottles over with deadly accuracy.
Clint's mouth dropped open at the fact that someone other than him could do that. The kid got a blue bear, but seemed to stare at it for a second, blinking as if he just remembered something. Steve caught the small smile, much lighter than the smirk had been, that had graced the kids face for a millisecond. At the same time he noticed the threatening aura that had surrounded the boy only seconds before disappeared for nearly a minute before it returned with his emotionless attitude. Clint had thought this change in demeanor to be strange, but pushed it aside in favor of a new challenge.
"Alright hotshot. Let's see how well you do at something else," he said, the confident smirk returning. The kid smirked back, a peak at the real him was unable to resist the challenge, while the other him just wanted to make more assessments about the two avengers.
"You're on!" He accepted the challenge, some excitement escaping into that monotone voice of his. Steve noted the continual change in behavior and demeanor. It intrigued him slightly, but it also puzzled him. Something about this boy made him not want to leave him alone with Hawkeye. Not only to keep an eye on him, but also to observe him, learn more about him. So as several challenges in-sued, he spent all of it following them, joining in a game or two, and most importantly, kept an eye on the kid who seemed to grow stranger and stranger with each minute. He appeared to be equally matched with Hawkeye in each aiming game/contest, and each time Clint became more determined to beat the kid. However, after an hour of this, the kid seemed to grow bored.
"Lets take this to the basket ball game," Clint said. It seemed he would never give up on his prideful challenge.
"Nah, I think I'm good now," the boy declined with a dismissing wave of his hand. Clint blinked in surprise.
"Seriously? Come on just one more!" He tried to convince the monotone boy, to no avail.
"Sorry, but I've had my fill of challenges today. Maybe next time," he said as he turned and began to walk away with his prizes. Something was hidden in his tone. Steve barely noticed it, but it set him teetering back on a edge of suspicion.
"If there is a next time," the Captain cut it, watching the boy carefully as he paused.
"Right," he agreed after a moment of silence, but there was something of a smirk to his voice. Another look at the boy as he walked away showed he was right, for that was exactly what the kid was doing. He was looking back and smirking and all to knowing smirk at them. Somehow that kid knew they would meet again. He knew they would and Steve knew that it probably wouldn't be on good terms. Clint paused in his fussing when he saw that smirk and they both watched the kid as he vanished into the crowd without a trace.
"That was weird," Clint spoke up after the kid was out of their sight. Steve nodded, his eyes narrowing at the spot he last saw the kid.

More answers. Yes the Chapters will get longer and better. How many of you already know who the kid is? Review and leave me your answer. :)