A.N. - Hello everyone, this is the first time I've practiced writing in quite a few years, though I frequently read fan fictions from others on this site and have done so for quite some time. I would like to say first that this story was inspired, like so many others I have seen, by Gabriel Blessing's stories "Hill of Swords" and "In Flight," both of which I highly suggest reading.

That being said, I would have probably been content to simply continue reading fan fictions as opposed to writing them if the idea for this story hadn't come across me. I would have loved to read this crossover if it were written by someone else, but given how old the series involved is I doubt it would have ever been done. So I figured I may as well take a crack at writing if, if for no other reason than the hope that someone will see the idea and decide to do it better than I am capable.

While I doubt it needs to be said, I should confirm that I do not own The Familiar of Zero or Gundam Wing, and that this story is not intended to make me any profit.

With that said, please enjoy the following as best as you are able:

Zero-One

Prologue – Fallen Angel

"Grandpa, what is that?" The little girl asked, eyes sparkling brightly as she gazed up at the sky.

"An angel falling from heaven, trying to erase the sins of man my dear. Pray for him, won't you?"

The girl smiled and nodded. "Mmm! I will!"

Far above the earth a group was watching the momentous event from another angle.

"He's not gonna make it!" A young technician worriedly exclaimed from a nearby data station.

"Oh, he'll make it." A slightly older woman with golden hair replied, as she calmly watched the ship's external display.

"But he's gotta make it through the atmosphere's high temperature!" The technician responded.

"From what I've seen, the gundams can overcome any obstacle." A strict looking woman with long, dark brown hair replied.

"That's true. We can believe in him." The youngest of those watching said. "Because Heero can give everyone hope!"

And so Relena Peacecraft, along with her friends, comrades and former enemies watched and hoped. The fate of the world was about to be decided, and not even the former queen of that world could do anything but observe in silence.

Red warning lights were all that lit the small cockpit surrounding him, and sirens were going off continually. Though he supposed that the color of the lighting could be a result of the gundam breaching the atmosphere as well.

Heero Yuy ignored the alarms as he made several small adjustments to his approach vector. His gundam shrieked in protest as it fought against the intense turbulence and heat that resulted. He ignored that too. Nothing mattered now except finishing his mission. The most important mission he had ever been entrusted with, and possibly the last as well.

He glanced to a monitor on his right as a bright flash of red emanated from it. The last remaining section of the space battle station Libras had just entered the atmosphere as well, and was giving off an amazing amount of energy. Still, the remaining block was too big to be burned up entirely, and the power supply it carried would be enough to ensure a never-ending winter for the planet earth if it made contact. Millions would die in the resulting blast, and billions would follow as the earth turned into a barren tundra in the space of a few weeks. He wouldn't allow that to happen.

"I will." He said to himself. Pieces of the gundam were beginning to break free. He hadn't lost any critical systems yet, but it was only a matter of time.

Heero thought back to the path that had led him here. Trained from a young age to be the perfect soldier, he had been molded from birth to change the world. Now he was the only one capable of saving it.

"I will…" He repeated. The intense heat and shaking were getting worse. Targeting the falling station in these conditions was a nearly impossible task.

During his struggle against the corrupt earth sphere, and the secretive society named OZ, he had come across many different people. Some were enemies, others allies. His experiences had changed him, and for a time he had been concerned that he had been made weaker as a result; a lesser weapon. He knew better now.

"I will!" The targeting system was getting close now. It kept wavering back and forth across the body of the block. More of the gundam's heat shielding was breaking free. He would only get one shot at this, and anything but a direct hit on the power core would be insufficient to prevent the earth from being devastated. Maybe Zech's plan to drive the thought of war from the hearts of men by creating a tragedy to dwarf all others could work, but he wouldn't allow it. Peace gained through such means would have no meaning.

Peace was something that Heero had always fought for but never understood. He was born and raised to be a weapon. Peace was a fine goal for soldiers, but in the end he had always understood that all it would mean for him was to be discarded. Until he had met her. The one who had made him understand not only the possibility of true peace, but who had also believed that he had a place in it. Because of her, he could finally believe in a life beyond the battlefield.

"I will survive!" He proclaimed as the targeting sensors finally established a lock onto the falling space station. A massive beam of energy shot out of the enormous rifle tearing across the sky towards the massive block of debris. The station was pierced through by the powerful beam, and for a moment he was afraid he had missed. His worries turned out to be for nothing though, as a second later a massive explosion tore through its center and scattered the remains of the station to the corners of the earth like so many shooting stars.

The explosion was so vast that it obscured the sensors of all the ships watching these events unfold, so no one noticed a huge green portal opening behind the Wing Zero as the shockwave of the explosion catapulted it through. Its pilot would be remembered for the rest of time in this world as the savior of the earth sphere, who helped to usher in a new age of peace and prosperity for man. In another world, a new chapter in his story was about to begin…

Louise Francoise de La Valliere wrung her hands nervously as she observed the results of the ritual. This time, for sure, she couldn't have made any mistakes. She was sure that the spell had been performed perfectly. But for every heartbeat that went by her hopes sank further. None of the other students' spells had had any delay. Their familiars had appeared as soon as the incantation had been completed. She couldn't bear the thought that she had failed again, especially after…

Wait, what was that? A green oval had appeared in the air over where she had arranged her runic circle. Well, at the very least it was better than anoth-

Boom! A huge crash sounded throughout the courtyard and the startled yells of students could be heard as the resulting tremors in the ground knocked them from their feet. An enormous amount of dust had been knocked into the air, preventing her from seeing anything further than two feet in front of her.

Dear Founder! That had been the biggest explosion that she had ever caused! And Louise was, unfortunately, quite experienced with causing explosions. She winced as she thought of what Professor Colbert and the other staff members would have to say regarding this mess. And that was nothing compared to the reaction her fellow classmates would have. A breeze blew past her as she absentmindedly attempted to dismiss the situation.

"It was nothing! Just a small… mistake…" Louise trailed off as the wind, likely summoned by one of her fellow students, began to clear away the obscuring clouds of dust. As the dust dispersed, she was able to make out the first glimpses of just what it was that she had summoned. It was huge! Far larger than any of the other familiars had been. It also seemed to be made of… metal? It looked vaguely human in shape, and as she continued examining it, eyes growing wider all the time, its head turned towards her and its eyes began glowing with an intense green light.

Louise reacted as any rational person in her situation would and promptly fainted.

AN – I won't make it a habit of doing two of these a chapter, but I wanted to make a few things known for the fic. First, I am not a consistent writer. I sadly will likely not keep to any type of schedule. I do have a plan for the fic though, and have every intention of finishing it. I just can't promise that it will be updated weekly, though if the mood strikes me you could see several chapters in the course of a few days. Most chapters should end up being significantly longer than this prologue.

Another note, this story takes place at the end of the Gundam Wing television series but before Endless Waltz. There will be no further scenes in the Gundam Wing universe, so you can be left to assume that the events from Endless Waltz do not occur. The Gundam Heero is piloting is the Wing Zero Custom, despite the fact that in canon he would have been flying the standard Wing Zero.