Tom Riddle laughed loudly as he raised a hand, causing a shield to come to life around him as Dumbledore jumped to his feet and launched a powerful stunning spell in the direction of the figure behind the desk.
"Wow, wow, wow. I'm sorry about that, Albus," the man said as his features returned to those of Harry Potter, and then changed again to Albus' own. "I must admit, that was a rather dramatic and idiotic way for me to explain to you," Albus' own voice told him as the real one breathed hard, his hand holding his chest above his wildly beating heart.
Once again, the man turned into Harry, motioning at the seat behind the older man. "Please have a seat, Albus. This may be a long talk."
Albus nodded as he took a seat, putting his wand away. His eyes weren't twinkling as he said to Harry, "I would suggest that you don't use that trick in that fashion with anyone else, Harry. If I were a few years older, my heart may not have been able to handle the shock. So. You're a metamorphamagus?" The old Headmaster asked.
Harry shook his head as he thought about how to continue. "No… I can't say that I am. Though the way in which I told you may have been… ill advised, what I told you was correct. I'm not exactly human anymore. When Tom caused the explosion, he… Destroyed both of our bodies. Like when he used the Killing Curse on me as a child, his spirit remained on the earth, held together by his desire for revenge, his hate. He thought that he could get rid of me with that explosion, and then have his followers revive him once again… And it probably would have worked, as I see," Harry glanced down at the book on his desk, "Lucius is contesting to become Minister. He's not the only Death Eater who convinced Corneilius that he was under the Imperius, so it would have been easy enough for them to revive Tom... In fact, they did try. Severus wasn't invited, and it didn't work, so you wouldn't have known about it.
But on with the story… Both of out bodies were destroyed in the explosion, his spirit being held together by desire for revenge and hate… Mine being held together by my love for my friends and my desire not to see anyone else hurt like that again. As spirits, we battled for survival… But that's where we come to The Power that Tom Knew Not. I was never as strong as you, or Tom before my body was destroyed… The Channels for my magic just weren't developed enough… But when my body was destroyed, my power was infinitely larger than his own… It took me the time from when my body was destroyed, until the flames of the blast dissipated to send his spirit to face the God of Death for his crimes in the world of the Living."
Harry took a moment to take a drink before he continuing, "I vanished before the smoke was fully cleared, and 'slept' for several months. In the time, I dreamt and Saw the future. There were three possibilities. In one, I saw all of my friends, all of my 'enemies', and everyone else in the Wizarding World, laying dead before Hogwarts. Every magical being, person and creature was rounded up and killed by the Muggles.
They didn't only greatly misunderstand what magic was, but they misunderstood how it kept the world dying. With the Wizards and Witchs dead, the seal they put on the hole in the Ozone vanished, and the polar icecaps melted in a matter of months, flooding the Earth. They shield that was raised many thousands of years ago by the Egyptians, to deflect any asteroids or comets that were set to strike the Earth vanished. Some million or so people survived the melting of the ice caps, but six months later, they couldn't survive the Earth Killer that struck. In nine months, all life on earth ceased to exist.
"In the second, I got my body back and I poured my magic into ridding the Muggle world's memories of the battle with Tom, and poured my magic into making everything invisible again. Life went on for the Magical and Muggle worlds as normal… For about 437 years, give or take. By that time, Luna had been colonized by both Muggles and Wizards, as had Mars and several of the Moons of other planets. That had been done probably 120 years from now. The rest of the time was spent mining, making better ships, better weapons… For Wizards and Muggles alike. But the Wizarding world was happy enough to stay in this star system… But the muggles wanted to strike out, explore the rest of the galaxy. So, they built ships that were able to travel fast enough that they could travel to other star systems relatively easily. They colonized the Alpha Centuri system, and several others.
"And then, they met the 'Greys.' They had been visiting earth thousands of years… You know, the Pyramids, crop circles, anal probing… That kind of stuff… The first ship they met was a colony ship. No weapons, no shields. So, the Muggles attacked, took all the Greys back to Earth and dissected them for science… Muggles, always with the 'science'…
"The Greys were outraged, but the Muggles didn't seem to care. The Wizards tried to negotiate, tried to explain that they weren't the same as the Muggles… But the Greys weren't interested. They hunted down and exterminated every last human in the galaxy, Muggle and Wizard both. They were thousands of years ahead of the Muggles in technology, and Wizards had grown lazy, forgotten a lot of the Magic we have today. There was no defense against them. So, it took several hundred years longer, but in the end, the Muggles destroyed Humanity once again.
"Then we had this last option. I don't know much about this one, since I was only getting information about how it was Humanity was dying, and how I brought about each time line… But I do know, there will be many wars, both on Earth and against aliens… But with New Hogwarts and Luna, Humanity doesn't end. The Polar Ice Caps don't melt, and a planet killer doesn't hit Earth. The Muggles aren't permitted to go out into the Galaxy and dissect much more advanced aliens and bring down their wrath. We actually get to meet the aliens first, and make a good impression on them…
"So, here we are… I made the only choice I could, and Humanity will go on. Of course, that's the long time. In the short term, I have to bring the rest of the Magical Community up here, get the new Ministry set up… With your help, of course, and set the Muggles, and some of those on Luna straight about how things will work from now on..."
Albus was silent for a long time, before saying, "That is a very interesting tale, Harry. You certainly have a lot on your shoulders. But that doesn't very much explain how you're not human yourself. Tom was a spirit and he came back. He wasn't very recognizable as human, but he still was human. What is the difference?"
With a bit of a sigh and a nod, Harry suddenly turned into a cloud of energy and floated up into the middle of the room, glowing a brilliant green. "I can take any shape I wish… But I'm actually the Son of a God. Hermes, the Messenger was given a... vacation of sorts, after seeing that the seeds that would grow into the Internet were planted. He was born to Harold and Virginia Potter, as James Potter. He never knew who he was, as James, but when he was 'killed,' he returned to Olympus with my Mother. When I was 'killed,' I lost most of my human side, and upon meeting Zeus, I became the God of Magic."
Dumbledore's eyes widened dramatically and he fell to the side, fainting. At least, Harry hoped it was a faint. As he returned to his body to check Albus' pulse. The man did mention that his heart might not take another shock, after all.