Summary: Tony Stark finds himself in a world he has no memory of where Thanos isn't a problem. Yet. Is history doomed to repeat itself or will he discover a way to help his team in both the old world as well as the new? Will he find a way to return to his old world or will new bonds that he's formed make him want to stay?

Featuring: Tony Stark, Pepper Potts, OC, All the Avengers, and others.

Setting: Post Infinity War. Sort of.

Notes: Haven't decided if I'm going to pair Tony's sister with anyone yet. I'd love to hear what you guys think. Also I haven't seen Endgame so don't worry this won't spoil the movie at all.

"Steve!" The older woman's face lit up at the sight of him making her smile broadly at him.

The blond superhero smiled at her. "Hey, Peg."

"It's good to see you. So what brings you here?"

He chuckled softly at that. "Oh c'mon, Peg. Can't a guy just want to visit his best girl?"

"Well yeah, sure, but I know you, Steven. I can tell when there's something on your mind." Peggy spoke pointedly at him.

Steve sighed nodding his head. "Alright, there is something on my mind. We received intel that Hydra wants to take Elizabeth."

"Those bastards. Oh pardon my French. I told him. I told Howard that he was being foolish. But did he listen to me? No, of course not."

His brows furrowed in concern as he listened to her. "Peggy, it's alright. What are you talking about?"

"Steve, you can't let them get to her. Promise me. She doesn't deserve that." She grabbed his arm looking at him seriously.

Steve placed his hand over hers and smiled reassuringly at her. "Elizabeth is safe. We're not going to let anything happen to her."

She was oblivious to it at first. Too preoccupied with thoughts of her new nephew who was currently in her arms. The brunette had insisted that she would watch him while Tony and Pepper took a well deserved nap. A rare smile graced Bucky's face as he watched her move around talking to the infant cradled within her arms. She was a natural with the baby and probably didn't even realize it. The brunette glanced up only to meet his gaze.

"Uh, hi." Elizabeth blushed realizing he had been watching her.

Bucky smiled a bit more at her. "Hi. So I take it this is the newest member of the Stark family?"

"Yup. Morgan Stark, meet James Buchanen Barnes. Otherwise known as Bucky." She grinned softly as she walked over and showed him the baby.

He hesitated before looking at him. "I shouldn't..."

"James, the accident wasn't your fault. It was Hydra's. They brainwashed you. Look, I was a scared five year old, but even I remember that you never tried to hurt me. You were the one that called the cops, weren't you?"

Bucky sighed nodding his head. "I was supposed to take the files and.. eliminate your parents. You weren't supposed to be in the car. I heard you cry and I couldn't do it. That was the first time I broke past the brainwashing."

"Bucky..."

He cleared his throat having watched them from afar. "Is that my godson I see?"

"I thought Bruce was his godfather." She teased the older man looking over at him.

Rhodey smirked greeting the baby. "He has two."

"Of course he does." Elizabeth let him hold the baby and then frowned when she saw that Bucky was gone.

Steve sighed as he sat down. "Peggy got pretty upset, but I was able to get a hold of the files with her help. Bruce is looking them over."

"I looked into SHIELD reports from the eighties. Howard was working on a breakthrough in the Super Soldier Serum technology. It's never outright stated what the breakthrough was though. There is one notation around the time of the Starks' accident that mentioned he was headed to D.C. to talk about the breakthrough." Natasha filled them in.

Bruce adjusted his glasses setting the files down on the table. "Well I looked over the files. According to these, Howard was going to tell them that the breakthrough failed and that he didn't see it ever being successful. Except the tests and research show that it was quite successful."

"So do you think that's what Hydra is after?" Maria Hill asked looking over at Bruce.

He sighed nodding his head in agreement. "Yes. According to these files, Howard was finally able to replicate a working serum nearly identical to the one that was administered to Steve."

"But Hydra already has the serum sample and the files about it." The redhead countered appearing a bit confused.

Bruce pinched the bridge of his nose for a moment before looking at everyone. "I'm assuming those files enclosed the exact nature of the breakthrough. It's Elizabeth. She's the breakthrough."

Bucky's hand nearly broke the table as he slammed it down on top of it. "What?!

He sighed again remaining calm. "Howard's breakthrough was in gene manipulation. It was the early days of surrogate gestation. He injected the embryos with the serum. Only one survived. Elizabeth."

"But how is that possible? She hasn't exhibited any of the traits from the serum." The brunette agent spoke up.

"Or has she? We only truly know how it affects an adult after they've been injected with it. We don't know how it affects someone who was born with it." Natasha pointed out.

Bruce nodded his head in agreement. "She has nothing unusual in her health history to suggest that the serum might be having an adverse affect on her."

The blond raised his eyebrows. "What if Tony's memory issues are on purpose? Take out her number one protector and distract the rest of us so they could grab her."

Bucky frowned at that. "Well Hydra does have the means to mess with someone's memory. Who knows how advanced their techniques have gotten by now?"

"Wait, there is one thing that doesn't make sense. If Howard was going to tell the government that his testing had failed, then he never would have outed Elizabeth in his notes. So how did Hydra figure out it was her before we did?" Agent Hill looked around at them perplexed.

Tony poured himself a cup of coffee taking a sip before turning his attention to the other man in the room. "Alright Cap, what's going on?"

Steve rubbed at the back of his neck looking over at him. "We've gotten intel that Hydra wants Elizabeth."

He froze and Rhodey placed his hand on his shoulder. "They're not going to get her or any other Stark."

The blond sighed nodding at the men. "Of course not, but there's something you should know, Tony. Your sister... she was the first and only person born with the super serum inside of them. That was the breakthrough Howard was going to talk about in D.C., but he was going to tell them that it wasn't successful."

His brown eyes widened in a mix of shock, confusion, and anger. "What? How?"

Bruce glanced up from his tea. "When your parents went through with the surrogate pregnancy, Howard injected the serum into the embryos. Your sister was the only one that survived."

"What?" Her shocked voice caught them all off guard.

The group of men looked over at her only for the young woman to run out of the room. Tony sighed and finished his coffee. They all looked at each other though it was the older Stark that stepped forward.

"I'll go talk to her."

Elizabeth was curled up on her bed crying. Tony's face softened at the sight. Sure, he still didn't fully remember her, but he hated to see her so upset. He sighed sitting down beside her. She leaned against him crying some more.

He wrapped an arm around her setting a box of tissues in her hands. "Shh, it's alright."

"It's not alright! I'm just an experiment." She shrieked grabbing a tissue and wiping her face.

Tony shook his head. "You are not just an experiment. Mom loves you. Dad loved you. I love you, sis. You're family. You were always family."

"Oh please! We nearly got killed because he was on his way to D.C. to brag about me."

He turned her chin so that she was looking at him. "Elizabeth, Dad was going to tell them that his tests had failed. Yes, he injected you with the serum, but ultimately he chose to protect you instead."

"Really?" Elizabeth sniffled smiling slightly at him.

Tony smiled nodding his head reassuringly. "Of course."

"Okay. Tony, I want tests run on me. See what effect the serum is really having on me." A determined tone was in her voice as she wiped her eyes.

He relaxed a bit already making notes in his head. "Alright, no problem. I'll get it all set up."

"Do you think they were ever going to tell us?"

Tony sighed pressing a kiss to her head. "I don't know. You'd think after the whole me being Iron Man thing and Cap being found, Mom would have said something. I think she feels that she is protecting you by not saying anything."

"Maybe we should talk to her and Aunt Peggy. Get the full story." Elizabeth glanced at her older brother.

He nodded his head in agreement. "Of course. If that's what you want, we'll talk to them."

"Also um, you can tell Pepper. I feel like you could probably explain it to her better."

"I'm going to look at your samples then I will compare them to Steve and Bucky's. We should be able to get an accurate picture then of just how the serum is affecting you." Dr. Helen Cho explained.

"Thank you. I've also already consented for you to have a look at my medical records." The younger Stark sibling informed the doctor.

"That I did see, yes. Thank you. I did get a look at them and there is nothing too out of the ordinary in your medical history. From what I can see so far, you are quite healthy, Miss Stark." Helen assured her with a warm smile.

Tony looked on curiously. "How sure are we that it's even in her? She hasn't shown any aggression."

"Neither did Bucky or Steve according to the files." The doctor looked at him.

Bucky leaned against the doorway looking over at them. "The research notes that I.. the Winter Soldier.. stole from Howard were used to manufacture more serum which was used to create more Winter Soldiers."

The older Stark sibling looked over at him. "Weren't they frozen?"

He sighed. "Yeah they were. Because they became ultra aggressive and tried to take out the Hydra soldiers. Even I could barely fight back against them."

"But if those notes were about the serum in me, why haven't I become aggressive?" Elizabeth asked clearly confused.

Tony looked at his sister and smirked. "Because they weren't his real notes about the serum in you. I think dad was just about able to perfectly replicate the serum that was used on Cap, but somehow modified it so you wouldn't be affected by the aggression. He clearly left out the modification part."

"Have you ever exhibited any signs of enhanced strength, agility, or perhaps healing?" Dr. Cho turned her attention back to the younger Stark in question.

"I..no. Tony always had to open jars for me. Does running count? I've always been a really good runner. As for healing, I never really noticed. Unless you count the car accident when I was five. I probably should have been sore for longer than I was, in hindsight." She recalled for the doctor.

"Alright, well that is all the information that I need right now. I will let you know what I find as soon as I can. You just try to take it easy." Helen jotted a few notes down and smiled at her.

In the meantime, Elizabeth had busied herself with work. Everyone gave her space yet still kept a protective eye on her from a distance. It was a rather uneventful day for Stark Industries staff until the sound of the fire alarm rang out around the building. A faint scent of smoke in the air sent everyone into a bit of a panic and the employees made their way out of the building. Elizabeth began to follow suit only to stop for a moment in the hallway when she heard someone call her name. She glanced around only for her brown eyes to widen when she recognized the voice that was calling out to her.

"Dad?"

She looked around confused until she saw what she thought was Howard Stark at the end of the hall. Momentarily forgetting about the fire alarm, Elizabeth ran down the hall only to hear another voice call out her name. It was Natasha. She turned to look at her and when she turned back, her father was gone. The sounds of fighting caught her attention for a moment only for her to feel something pinch her neck and then suddenly her whole world went black.

Tony was livid when he heard the news. "What the hell happened in there?"

"They lured her right to them using Howard. She thought he was really there. There were no indications of a security breach. The moment that alarm went off, I went to her office and Peter made his way up to her floor. Just as we finish getting through the Hydra guys, one of them jumps in through the open window and injected her with something. She passed out and he took off out the window with her. Peter followed them as far as he could." Natasha informed him.

"Somewhere in the woods. I sent Natasha the coordinates and a recording of what they were saying to each other." Peter spoke quietly over the communication system as he stayed hidden while keeping an eye on where they were holding Tony's sister.

The recording played and Bucky looked at Natasha. "It's Russian. They're going to run tests on her to determine if it is worth their time to take her to their actual labs in Austria."

"She might be worth more dead than alive." She finished translating what the second voice was saying.

Steve stood up a bit straighter. "Parker, any idea how many Hydra are in that building?"

"No clue. It's heavily guarded on the outside. Hard to tell how many are on the inside without getting closer." The teenager replied softly.

He thought for a moment then looked around. "Alright, good job. Stay put. We'll be there soon. Keep us posted if anything changes. Everyone else, suit up. Tony, you sure you... Oh."

Tony had already begun to suit up and looked over at him. "What? She's my sister. I'm not sitting this one out."

Steve nodded his head in agreement. "Alright then. Let's go get Elizabeth back."