Disclaimer: I don't own anything of the Avengers, just my OC Rosie.

A/N: So, this is a story about Bruce having a daughter. It'll be one of a series of stories where all the Avengers have kids, but in completely separate universes, not all at the same time. This is Banner's. Enjoy the fluff!

It was a day after the battle of New York. The Avengers were still at SHIELD New York HQ, being treated for injuries, guarding Loki, and more importantly, guarding the Tesseract.

It was 2 in the morning when the alarms started going off. The Tesseract's energy levels were spiking dangerously high. The Avengers assembled in the room, weapons at the ready, along with a ton of SHIELD agents.

"Is this another part of Loki's plan?" Fury asked Thor.

Thor shook his head. "He no longer has control over it."

"So someone else is sending something through," Clint said. "Great."

"Don't they know it's our day off?" Tony added, firing up the repulsors in his suit just in case.

The portal from the Tesseract started to form and everyone tensed. The portal began to glow and they started hearing a voice filtering from the portal. It sounded like a girl... "No! No you can't do this to me! Stop! Take me back!" There was a bright flash of light and energy, and there stood a teenage girl, dirty, her clothes ripped and scorched, screaming and sobbing. "No!" She yelled, oblivious to the twenty people holding weapons. Before anyone could stop her she shook the Tesseract's case like you'd shake a magic 8 ball. "No! Take me back! Please! Take me back!" She dropped the Tesseract onto the table and fell to her knees, sobbing heart-wrenchingly and looking dizzy. She pulled a tiny arrow from her shoulder and growled. "You bird-brained jerk..." she slurred, and passed out.

Everyone was still staring, frozen, at the unconscious girl, when Clint said mildly, "Uh, guys, she's bleeding." They all saw the growing red stain under the girl's midsection then.

Fury snapped into action, calling in a med-team, securing the cube, having the Avengers stand down, and starting Tony and Bruce on the job of tracing where she'd come from.

The unknown girl was rushed to the med ward. She had three bruised ribs, burns on her hands and face, various bruises and cuts, and an energy blast wound under her left ribcage. She also had a tiny puncture wound from a tiny arrow on her neck.

Clint was looking at the arrow, turning it over and over in his hands. He looked pale.

"Clint?" Natasha asked, eyeing him. "Do you recognize it?"

"It's mine, Tasha," he said in a hoarse tone. "This is one of mine."

"That's impossible," she stated flatly.

He showed her the purple and black feathers, and the tiny hawk on a shield that was always stamped into his weapons. "This is definitely my signature," he said. "How-"

She put a hand on his arm and squeezed it reassuringly. "We'll figure it out Clint."

Six hours later the girl was starting to wake up. The Avengers went en masse to question her, although Bruce and Steve were in the front, being the less threatening looking ones of the group.

The girl sighed softly and her eyes flickered open. She stared up at the white ceiling and groaned. "Whuh, what hap-" she stared, her eyes in the general direction of the team, and then she froze. And her already-pale face turned an ashy grey. "Dad?" she whispered.

The Avengers shared a glance. "No ma'am," Steve said gently. "You're in a SHIELD medical facility."

"SHIELD... Steve?" the girl said, still having trouble focusing. "Cap'n 'Murica? That you?"

"Yes."

She closed her eyes. "I thought you were dead. You're all dead. Why are you here? Am I dead too?" she demanded, her eyes wide.

"You're definitely alive," Bruce said, coming closer to help her lay down again. "Are you in pain?"

"It hurts, daddy," she said softly, grabbing his hand.

Bruce froze. "I, I'm not your dad." He pulled his hand away from hers. "I'm sorry."

The pain meds wore off right about then, and she stared, wide-eyed and clear-headed, at them. "Oh no," she moaned, her head dropping back to the pillow, "I remember." Tears started to fill her eyes.

"Can you tell us how you got here?" Steve asked, glancing uncomfortably at the others. He didn't know what to do with a crying girl.

She made a visible effort to compose herself and nodded. "I, well, this is going to be hard to explain. You know what the Tesseract is?"

"A glowy blue source of infinite energy," Tony supplied helpfully.

"Descriptive as ever, Tony," she said, rolling her eyes. "Yes, that's what it is. But it also can create portals."

"Yeah, we know," Clint said. "Your point being?"

She glared at him. "My point being stop shooting me, Featherbutt."

"Excuse me?" he said, eyes wide, and heard Tony snicker.

The girl closed her eyes again, fighting for clarity. "Sorry, I forgot- anyway. Point being, the Tesseract doesn't only create portals between two points in spacetime, but it can also create portals to different versions of itself. As in, alternate universe versions of the Tesseract. I'm from one of those universes. Approximately, 12 universes to the," she looked at her hands, "left."

"You're from a different universe," Steve stated.

"Yes."

"Go on," Tony urged.

"Okay. In my universe, SHIELD had the Tesseract and brought my dad in to study it and figure out how to harness its power. They knew what HYDRA had done with it and wanted to use it to make their own version of those weapons."

"Phase 2," Tony supplied.

"Okay, so they did that here too. Anyway, that was a few years back, because Loki ended up banished here as a mortal and started working for SHIELD. Well, he's on probation. If he does anything suspicious Tasha's supposed to kill him, Thor or no Thor." She rubbed at her forehead tiredly, not noticing the others' complete shock. "Anyway. Um. My father figured out the whole alternate universes thing and we've been experimenting with it, trying to get it to connect. And then, a month ago-" She broke off and her eyes filled up with tears again and she bit her lip, hard.

Bruce reached out awkwardly and patted her lightly on the arm. "It's okay," he said. "Take your time."

That only seemed to make it worse, and a few tears slipped down her cheeks. She took a deep breath. "And then a month ago," she continued, her voice shaky, "this army appeared, from space. These aliens, called the Chitauri."

Everyone flinched.

"They were led by this guy, I don't even know what his name was. But he brainwashed people. Erik Selvig, Clint, Loki, used them to bring his army into New York."

"We know," Steve said. "That just happened."

She stared at them. "But how are you still here?"

"What?"

"How are any of you still alive if that happened?" She looked like she was going to cry again.

"What happened in your universe?" Tony asked, trying to keep her on track.

"They won the first battle," the girl said, her voice shaky, her tone haunted. "New York fell within twenty four hours. We got Clint and Loki back but lost Erik to the battle. We couldn't figure out how to shut it down. There was literally no way to do it, not even with the Phase 2 weapons. They worked against h Chitauri, but there was just so many of them. The Chitauri just kept coming, and coming, and everyone just kept fighting. But we were losing. We lost Natasha in the first week. And the helicarrier went down in the Pacific the second week. Iron Man and War Machine were dead by the third week. They died protecting us. We got to New Mexico. We tried to send a message to Asgard but they didn't answer. They're at war with Jotunheim anyways. Thor's there, now. I hope he's still alive. I don't know. He probably is. He's the king you know."

She wasn't even seeing the people in the room with her anymore, the looks of shock and horror on their faces. "We got access to the Tesseract, once the portal was closed. At last count there were 24 million Chitauri. Loki died saving a SHIELD base. He redeemed himself. Anyways, it wasn't enough. We were still losing. But my dad figured we could use the Tesseract to power the weapons and win, or at least, you know, avenge. We were doing it, it was working, too. But then one of those big worm carriers came. Cap died right in front of me. It was really just Clint left. And then my dad decided to save me, instead of power the weapons. He opened a portal to the closest universe in alignment and tried to get me to leave. I didn't want to leave him, but he said, there still might be a chance. So Clint shot me with the tranq and they shoved me through. Something exploded, and then, I don't know. I was here." She started crying in earnest, then. "They're all dead. All my family, and, my dad..."

Surprisingly, it was Natasha who came forward, wrapped her in her arms, and held her close, letting her cry and rubbing her back, murmuring soft words in Russian. She didn't let go until the girl had stopped crying. "Just rest," Natasha said, smoothing the blankets out over the girl.

The girl looked to be on the verge of passing out again, but she tugged at the pendant around her neck. "Take it," she mumbled. "Information, it's a timeline, confirmation, schematics." She blinked a couple of times.

Natasha took it gently.

"Wait, wait, what's your name?" Clint asked.

The girl blinked. "Rosie," she finally said, before sleep took her. "Rosie Banner..." And she was out like a light.

Everyone's jaws dropped and they all turned to stare at Bruce. He was pale. "No way," he kept muttering.

"You have something you wanna tell us, bro?" Tony asked casually.

Bruce stood up suddenly and bolted from the room, breathing deeply. He felt like he was going to throw up.

To be frank he wasn't the only one. To learn that in another universe the battle you'd just fought twenty- four hours ago was still going on but you were dead...

Tony grabbed the pendant from Natasha before he could stop himself, and inspected it. The gold broke open to reveal a USB stick. "Interesting," he muttered. "Computer," he demanded.

"This way, come on," Clint said, leading them out.

"Whatever you say, Featherbutt," Tony retorted, grinning.

"Stark, shut up or I will shoot you."

They got Bruce in the hallway and trooped over to a computer lab. Tony accessed the USB device, and immediately a video screen popped up. On the screen was Bruce Banner. "Greetings, to whichever universe this USB finds itself in. Hopefully, I'm there too, so, hi me. In this USB, you will find a general history of Earth and the other realms, and the recent events that led up to the transfer of this USB. If we are in any way ahead of your timeline, or have done things you haven't, for the sake of the world, use that knowledge to benefit the human race. Goodness knows we all need it." The video finished, and immediately switched to another one.

In this one Bruce Banner appeared, dirty and ragged, an oozing cut in his forehead. There were explosions and noise behind him, and in his eyes was a gleam of desperation. "Listen to me," he said. "I don't know if your universe is the same as ours, I don't know if you won against the Chitauri or not. We've lost. Even if we succeed today we've lost far too much. But there is a chance to save someone. Captain America, Hawkeye, and I are going to try and take the Tesseract. We plan to send my daughter through. Rosie Banner. She's 16, she's a genius, slightly dyslexic." He ducked as a familiar shield whirled through the air above him and collided with something out of camera. "Please, if you're SHIELD, if you're the Avengers, take care of her. If you're a random person on the street who has no idea what we're talking about, help my daughter, please." He looked like he was going to cry. "After she's gone through, hopefully safe on the other side, we're going to use the Tesseract and blow the place up. It's the home base of the Chitauri. Hopefully with them gone, the rest of the Chitauri will die. But we won't be alive to see it. We knew that going in. I hope the Avengers of your world were better. I hope you get this video. Attached is all of Rosie's file, all of our pictures, her medical record. She's allergic to pineapple." He flinched as a Chitauri came up behind him and fell with an arrow in its neck.

"Banner we gotta go!" came Captain America's voice off the screen, hoarse and ragged, but determined.

"Don't tell her what we've done," Banner said to the camera. "She's thinks we're powering the Phase Two weapons. If she knew, she wouldn't go through. She's stubborn. Watch out for that." He picked up the laptop and ran with it, the camera shaking. "And tell her, tell her I love her."

The camera went static-y and the screen went blank. A second later a menu popped up to access the rest of the files.

Nobody spoke. Nobody moved. They were all too shell-shocked.

"We won, right?" Bruce asked finally, his voice hoarse.

"Yeah," Natasha said, swallowing hard. "We won."

"Just checking."

"I cannot believe..." Thor started, choked on emotion, and then continued, "I cannot believe that we would have lost in New York. Why didn't we succeed?"

"Maybe because you weren't there, to begin with," Natasha said, but there was no blame in her voice.

Tony accessed the files. "The Avengers Initiative," he said. "Put together by Nick Fury. Iron Man, Hawkeye, Black Widow, and Captain America- that's it? We know the other Thor's off-world in that world, but no Hulk?"

"The other me was there, though," Bruce pointed out.

"True..." Tony pulled up the SHIELD file that said 'Bruce Banner.' He skimmed it quickly and his eyes widened. "There is no Hulk in that universe."

"What?"

He moved the screen so they could see. "Dr. Bruce Banner, after the death of his wife he became an expert in gamma radiation, started working for SHIELD to harness the energy, formally protested against Phase 2, developed the transport through universes..." He trailed off. "Only relative, daughter, Rose Banner. Apparently she was a SHIELD consultant as well."

"Wife?" Banner asked, his hands shaking.

"Wife," Tony repeated. "A, uh, Dr. Elizabeth Ross. Died in an accident involving gamma radiation -" he broke off as they realized that it would've been around the same time as the accident that created the Hulk.

Bruce dropped into a nearby chair and held his head in his hands. "That should've been me," he groaned, shaking visibly.

Steve put a hand on Bruce's shoulder, keeping his tone level and soothing. "Bruce, it's okay. You're fine, Betty is fine. She's alive, and she's okay. Just focus on that."

"Yeah, and you're both dead now in that universe," Tony said, and promptly received a punch in the arm from both Clint and Natasha. "OW! You both can't do it at once!"

Bruce smirked. "Whatever."

They browsed the rest of the file about the battle of New York, and Tony realized something. "Where's Coulson?" he asked, ignoring the twinge of grief in his chest. "There's no Coulson in this entire file."

"Look him up," Clint ordered.

Tony searched the USB, and came up with nothing.

"He doesn't exist in that other universe," Steve said.

"Yet he was the key to our working together in this universe," Thor said, hitting the nail on the head. "Without him and the Hulk it is no wonder the Avengers did not win."

"So what do we do now?" Tony asked. "What do we do with mini Banner?"

"They asked us to take care of her, so that's what we're going to do," Steve said firmly.

"Cap, we can't just-"

"Yes, we can," he interrupted. "Who else is going to take care of her? She just lost her entire universe. She doesn't have anyone else." Out of the people in that room he knew exactly what that girl was going through.

"Steve's right," Bruce muttered. "We can't abandon her." He ran a hand over his face. "I don't know if she'll even accept me, though. I mean, her father didn't turn into a giant green rage monster."

"We're all going to help you," Natasha said, "it's okay."

He sighed heavily. "Okay."

Rosie stayed unconscious for a long time. Fury gave the Avengers custody of the girl and she was moved to Stark Tower with a nurse to watch over her.