A/N: Hello! You guys can call me Leia. This will be my first ever Avengers fanfiction! This is post-movie Avengers universe, by the way, and will include an OFC of mine, Leslie Adams. Her past, powers, and the like will be described later on in the fic [She is 36. She will most likely reveal her age regardless, but just in case she doesn't, now you know.]. I have the major plot lines already mapped out and waiting for me to write them. I just decided to go ahead and submit the introductory chapter to see how interested people might be in this story.

This will be categorized as action/adventure and drama until later chapters when romance may be involved. The same will go for the rating. Once the content becomes inappropriate for younger audiences, I will change the rating accordingly.

Enjoy the introduction to Leslie Adams! And please, criticism, reviews, and ideas are most definitely welcome!

Disclaimer: If you recognize it, it doesn't belong to me!

-Unauthorized Personnel Accessing Files-

The computer in front of Charles Xavier flashed red and alerted him to the hacking. Intrigued, he sat back and watched which files the intruder was after. Once the files of his students began flashing in front of him he reached over to his keyboard and began to interrupt the hacker's attempts.

His fingers tapped in the controls for the disconnection and he raised a brow when S.H.I.E.L.D.'s logo flashed on the screen quickly before the computer shut itself down. "Curious." He breathed before sitting back into his chair and pressing a button for the intercom. "Professor Adams? I need to speak to you in my office, please." He released the button and his eyes glanced back over to the now black computer screen. "What does S.H.I.E.L.D. want with our databases?" He mused to himself.

"Keep your chin down, your arms closer to your body, like this." A dark-haired woman stepped forward and corrected the young man's fighting stance. "See? Much more comfortable." Her dark blue eyes wrinkled around the edges as she smiled and wiped the sweat from her brow. "Now, let's see how your punches improve, Joshua." She gave him a nod and the young man flung himself towards her, his fists flying.

The older woman dodged his advances quickly, smiling warmly as his fists missed her torso. The gymnasium's air-conditioning did nothing for the sweat the two were working up with their spar. Her black tank top and sports bra were absorbing the sweat from her body and poor Joshua had to deal with his sweat as it forced his grey t-shirt to cling to his body, distracting him slightly.

"C'mon! You've got this! Hit me!" she encouraged before dropping to the floor to dodge a well placed punch from Joshua. "I've got beginners who do better!" she taunted, knowing full well that her student was competitive. Hopefully this will get him mad enough to stop worrying about hitting his professor. She stood while Joshua hesitated because of her taunt, no doubt thinking of a comeback. She wiped her grey sweats quickly before taking her stance back up. "C'mon, Joshua. Think of the kids who could kick your butt." She grinned.

"Not cool, Miss Leslie!" he roared before lunging himself forward and began to really fight her.

She smirked as she blocked his fists, feeling a twinge of pain each time they connected with her forearms. "Excellent!" she quipped quickly before blocking his next punch with her open palm and signaled for a break.

"You were right, Professor, that felt much better." Joshua grinned, no doubt pleased of his progress.

Leslie nodded and gave him a quick thumbs up before facing her class. "Fighting like this depends on both offense and defense," before she could continue the intercom buzzed, signaling a message.

Xavier's voice echoed through the gym and Leslie relaxed her stance and turned to the class. "Dismissed." She nodded and waited for the gym to empty before walking through the door and heading towards Charles' office.

Charles looked towards the door when he heard it click open. "Ah, good to see you Leslie." He smiled warmly before motioning to the seats before him. "There's been a security breach in our private files from none other than S.H.I.E.L.D." he stated, getting straight to business.

Leslie raised her eyebrow before leaning forward, curious. "Which files?" Xavier's look turned dark with worry and she knew exactly which files he meant. "The children's?" She paused trying to make sense of the situation. "Wait, why their files? We have adults more capable." She questioned quickly, concerned for the well-being of her students.

The older man stippled his fingers over his lap and shook his head slowly. "I honestly do not know why they were looking into the children's files, but I have to ask you to figure this out." He paused and shot her a serious glance. "S.H.I.E.L.D. is, from what I know, usually interested in global threats. I do not see how the children would be considered threats, but you must contact the head of S.H.I.E.L.D., Nick Fury, and deal with this situation."

Her eyes widened momentarily before she sat straight up. "Wait, wouldn't Scott be better? Or Logan! He could definitely do better with the threatening." She replied, astounded that a task such as this would be left to her. "I mean, I teach, mostly. I rarely go off to fight with the guys…"

Charles interrupted her, "Because, I believe S.H.I.E.L.D. is looking for someone to help them fight against a new threat. If that is the case, then we need to let them know that our students are off limits until they can decide for themselves. If they need help, then you are the logical choice, Leslie." He paused to take in her still shocked expression. "You work well on a team, and can adapt quickly to new environments. If this is a serious situation, Leslie, like the one in Manhattan with the alien forces, then they will need help, and you are the prime candidate to tie the X-Men and S.H.I.E.L.D. together."

Leslie shook her head. "You mean X-Men and the Avengers." When he simply nodded at her she sighed softly. "You wanted this in the long run, didn't you?"

Xavier chuckled, glad to see that she was still as sharp as ever, "Yes. The Avengers are a phenomenal group. They are tasked with protecting the world against major threats. Having someone with your talents and training both physically and intellectually would benefit the group greatly." His smile faded quickly and his expression took a more serious tone. "Erik's escaped, Leslie." Her astonishment swept across her face quickly before she policed it away. "I believe he is the reason why S.H.I.E.L.D. is looking for help from mutants."

Leslie looked down at her hands as they lay in her lap. She remembered fighting with Erik Lensherr, or Magneto as he calls himself, a few years ago. It seemed as if his brand of crazy never really wore off. She sighed and brought her eyes back up to Charles Xavier. "Tell me what to do and I'll pack my things." She stated coolly.

He smiled before pushing his chair around his desk and next to her. "First off, you need to get into contact with Director Fury. I believe I know just the person to help you get that far." He placed a hand over hers and gave it a light squeeze. "I know you'll do great, Professor Leslie Adams."

She grinned and squeezed his hand in return. "Thanks, Charles." She released his hand and stood before walking towards his door. "Who's the person?" she turned and asked before opening the door in front of her.

"Tony Stark. You'll find him at Stark Tower in Manhattan. Good luck."

Leslie smiled and thanked him before opening the door and passing through it.

A/N: Aaand CUT! That's Leslie's introduction, guys. I hope you enjoyed the read, and I apologize for the lack of Avengers in the intro. They will make a major appearance in the rest of the chapters.

Also, I will have artwork of Leslie Adams sooner or later. I just need to finish a few other projects first. I will let you guys know when artwork is available.

Betas are always welcome! If you wish to volunteer as my Beta let me know and I'll contact you further!