Okay, I admit. I should probably be worrying about fixing up and/or finishing "Origins." (Un)fortunately, I got this idea and couldn't get it out of my head, so one project gets laid off for another one to step forth. And it's a crossover? Good heavens, I must be insane! Again!

So…Kingdom Hearts and Danny Phantom. Kingdom Hearts can pretty much cross over with just about anything due to its nature, and this isn't exactly the first time I've done this. I've sifted through a few other DP/KH crossovers, but I haven't found one quite like the idea I have in mind, and you know what a wise man once said? If you can't find it, make it! Or something along those lines…

So, here's my go at it. Also, this fic is pre-Phantom Planet. You know, for reference and stuff.

Before you all kill me to death...

Disclaimer: I don't own Danny Phantom or Kingdom Hearts. They are owned by...uuh...their owners. And stuff.

Amity Invasion

By FlikFreak

Chapter One: Crossing the Line

"Mister Fenton, will you please pay attention!"

Danny Fenton snapped out of his catnap and sat straight up in his desk. Mister Lancer was staring at him with narrow eyes, and by the looks of things he was definitely not happy with the raven-haired boy. Danny quickly attempted to regain favor, but was quickly interrupted. "I understand my class isn't quite as exciting as your parents' occupation, but that does not give you an excuse to sleep through it."

The irony of the man's statement nearly gave Danny a headache. His parents were the most notorious ghost hunters in Amity Park, but what many didn't know was that he himself was also a ghost hunter, under the guise of Danny Phantom. While he was indeed successful in his endeavors, he often became exceedingly tired by the time certain hunts were through, and it never failed to aggravate him when certain ghosts failed to learn their lesson after being sent back to the Ghost Zone. Thankfully, the rate of attacks had significantly fallen in the past few weeks, but each encounter was still tiring in its own right.

Lancer cleared his throat. "Now, then. Before the bell rings, I have a special announcement to make."

Special announcement? Danny thought, sitting up in his chair a bit more. It wasn't every day they had one of these, especially from Lancer.

"We have an exchange student arriving tomorrow," Lancer continued. "He will be joining the Freshman class for an undetermined amount of time. I will introduce him to you all tomorrow, but I trust you will treat him with respect as a fellow classmate."

The bell promptly rang, cutting off whatever else Lancer would have said. Danny was glad to exit the class; it was the last one of the day and he had some serious homework to catch up on. It wasn't long before Sam and Tucker joined him in the halls.

"You hear the news about the transfer student yet?" Sam asked. "No one knows where exactly he's from or how long he's staying."

"Lancer announced it just last hour," Danny replied. "My parents were talking about having a visitor for a while the other day. I don't think it's a coincidence."

"You've got a visitor other than us?" Tucker exclaimed, somewhat sarcastically. "That's a new one. He a fellow ghost hunter?"

"I doubt it," Danny said, sighing, "Though whether he's a ghost hunter or just a ghost, I'm not going to be surprised. Mom and Dad said he's staying for at least a month or so, but they're not sure."

"Sounds suspicious if you ask me," Sam grumbled. "Unknown origin, unknown stay time…I wouldn't be surprised either, to be honest."

"He's supposed to be arriving tonight," Danny continued, "So I have to get home fast. If I'm late, I don't think Mom will be too happy."

"So why walk?" Sam answered, a rare mischievous glint in her eye.

Danny grinned back at her. He knew where she was going with this. "Cover for me, will you?"

Sora, for the very first time since meeting him, seriously doubted Cid's information. He had landed on a world known as Amity Park, which was supposed to be the top ghost infestation target around, but it seemed perfectly peaceful. He suspected it was probably because of timing issues, but he brushed it off. Cid had received readings from Amity Park signaling Heartless presence, and immediately contacted Sora and the Hollow Bastion Restoration Committee, whom all formed together for a plan to get rid of the menace. Unfortunately, none of them were simple, and they were left with only one choice.

"So, basically I'm going to school again for the first time in two years?" Sora asked, tugging at his jacket. They hadn't bothered giving him new clothes for the escapade, which he was very happy with. He had gone through quite a bit of astonishment and embarrassment to get his current ones.

"That's right," Leon repeated. He and Aerith were temporarily posing as his parents, mainly because Aerith had the right appearance and Leon was the only one of the right age to pull the trick off. Sora personally thought they looked a bit young, but he had seen some teenagers' parents look exceptionally younger than they actually were, so it wouldn't be too hard. "We've had to pull quite a few strings, so don't mess this up."

"You'll be staying with the Fentons as a foreign exchange student," Aerith explained calmly. "They have two kids, and one is about your age, so you won't be all alone. Just remember not to blow your cover unless you're in danger."

"Got it," Sora replied. It was somewhat different from his previous missions. He normally didn't have a problem with the keyblade showing up, but here it would make him stand out like a sore thumb. People didn't exactly wield swords here as far as he could tell. This wasn't going to be an easy task: it was basically sneak in, seal keyhole, sneak out, and don't get killed (or worse) while you're at it. At least the Organization wouldn't be after him.

But someone else was bound to be.

They finally came upon the house that Sora was to be staying at. It was certainly an odd piece of architecture; it looked like any other brick building other than the fact that it had a large metal UFO-style structure on top with the sign "Fenton Works" on the front. Simple, yet completely wacky. Nothing new there, Sora thought, But it certainly isn't what I was expecting.

Leon was obviously nervous about this whole affair; they were forbidden to bring weapons along with them, thus his gunblade was left in the Gummi Ship, leaving them at the mercy of Aerith's magic (which wasn't all that bad; Aerith was known to be a very formidable opponent in spite of her peaceful nature). Thankfully, they had no attacks on the way. Aerith was the one to knock on the door. "Remember the plan, Sora."

Sora simply nodded. It might be harder than it sounded, but the plan was all they had. He had to work with it.

The door opened to a woman dressed in a teal jumpsuit. Upon opening the door and recognizing the people before her, she pulled off her hood and red goggles. "Oh, hello!" She said. "You must be the Leonharts."

Leonhart, Sora echoed in his head. Gee, that's original. I guess I'll have to get used to that one.

"It's nice to meet you, Mrs. Fenton," Aerith said, bowing politely. "We're here to drop off Sora."

Mrs. Fenton cocked her head in concern. "You can't stay?" She inquired.

"I'm afraid not," Aerith replied. "We have some meetings to go to before we get ready to head back home." She bent down in front of Sora. "Keep in touch, sweetie, okay?"

Man, this is awkward. "Okay, Mom." After an odd hug, Aerith and Leon headed down past the stairs and down the street. Sora watched and waved awkwardly, still having a hard time accepting this whole façade. Aerith would make a great mother should she ever decide to have children, he decided. As for Leon, he had a hard time believing the man even volunteered for this. He'd sooner pass for a mercenary.

"It's awfully cold outside," Mrs. Fenton said suddenly. "Come on in, young man. We have dinner ready for you. Are you alright with spaghetti?"

Sora nodded. Spaghetti was more than welcome. In many of his adventures, he had usually been stuck with instant-fix meals or some form of Asian food. He could hardly remember the last time he had actually used a fork and knife, but thankfully he hadn't forgotten how.

As he and the woman made their way into the kitchen past what he assumed was the living room, Sora quickly caught sight of the family in the room. A rather chubby man wearing an orange jumpsuit (whom Sora immediately assumed was Mr. Fenton) sat next to a young, red-haired girl wearing a black shirt and headband along with a pair of jeans. She also had her nose buried in a book. At the far end of the table was a boy whom had to be around Sora's age. He had unkempt black hair and ice-blue eyes, and wore a white shirt with a pair of jeans. Something about the boy caught Sora's attention, but he couldn't quite pinpoint what it was.

"Everyone," Mrs. Fenton began, "This is Sora Leonhart; he'll be staying with us for a few months."

Sora took that as his cue to wave politely. The family returned the gesture.

After finding Sora a seat at the table (which involved a bit of digging through a nearby closet), dinner began. The keyblade master found it awkward to introduce himself to these strangers, in spite of having gone through a similar routine every time he went to a new world. This escapade, however, was going to be far more intricate than his previous ones, he was sure…

Thankfully, the introductions were short. After being introduced to the adults of the family, the children introduced themselves. "I'm Jasmine," the girls said, putting her book down now that the meal had started, "But you can call me Jazz."

The boy smiled weakly. "My name's Danny," he said, looking quite sheepish. Sora nodded at him, smiling brightly. It paid off; some of the anxiety on the boy's face faded a bit.

For a while, Sora feared that dinner would be a quiet occasion, but to his relief the parents were talkative – especially Mr. Fenton. "I've got a few new inventions underway, Maddie, and the new Ghost Finder is just about finished!"

"You seem to like ghosts a whole lot," Sora commented.

"Mom and Dad are professional ghost catchers," Jazz said, taking another bite of her meal. Danny vaguely nodded his head in agreement, but winced. He apparently wasn't fond of his parents' occupation.

"We haven't had much success lately," Mr. Fenton scowled. "Every ghost we run into either manages to get away before we can reach it or gets taken care of by someone else. We've been going after Inviso-Bill for ages and the only time we managed to catch him was when he blatantly sat in front of me, and I had to make a truce with him to get back to safety."

"At least you got out of there okay," Danny insisted, smiling uneasily. "I mean, not all ghosts are evil or anything, right?" The boy cast an odd glance to his sister, whom just smiled oddly. Sora also nodded in agreement. He had met a few ghosts in his own time; Jack Skellington's pet dog, Zero, had been anything but evil. The spectral canine had actually been a huge help to him.

"That is true," Mrs. Fenton mused, nodding somewhat slightly, "Though the only ones I ever see are the hostile ones. Inviso-Bill is a bit of a strange case, though; we've been tracking him for almost a year and we still haven't caught him."

"Kind of like that one fish the fishermen always go after?" Sora suggested.

"That and more," Mr. Fenton groaned. "Inviso-Bill's the 'big one' for us, all right, but for some odd reason he never fights back against us whenever we attack."

Sora swallowed down the last of his noodles (he wasn't sure if he was supposed to eat them like ramen or not, so he played it safe and stuck with the fork) and glanced around. Danny had been the only one to finish the rest of his dinner and was giving him an odd look. Everyone else was quick to notice, but thankfully the odd silence was quickly broken. "Danny, I'll clean up the kitchen," Mrs. Fenton began. "Would you please show Sora around the house?"

The raven-haired boy seemed a bit reluctant at first, but he nodded momentarily. "Okay." He quickly placed his dishes in the sink and made for the door to the living room.

As Danny stood, Sora abandoned his own chair, bowing politely before following his guide. "I take it your parents are pretty interested in ghosts?" he said once he was sure they were out of earshot. In attempt to further appeal to Danny, Sora gave an odd smirk to him.

Thankfully, it worked; Danny rolled his eyes and laughed. "You have no idea," he grumbled. "Once you get my dad started he'll never shut up, but thankfully Mom's a bit more reasonable."

"What about you and your sister?" Sora continued, hoping to make some conversation as they passed into the living room by the front door and up the stairs.

"Jazz is more into psychology than anything," Danny replied. "Me? Well…" He paused, an unsure expression on his face. "It's hard to say. I want to be an astronaut more than anything."

Sora couldn't help but smile. He had flown through space more times than he could count, shooting laser beams at enemy space ships and asteroids, not to mention visiting countless other planets. After all, before this whole mess had started, he had wanted to see other worlds. "Looks like we've got something in common," he said a bit more quietly than he intended. "I've had a sort of interest in astronomy myself."

Danny's eyes seemed to light up and a smile beamed across his face. "Really?"

"Yeah. I've always wanted to go out and visit other planets and stuff." Upon saying it, Sora couldn't help but remember where that had landed him. Oh, the irony…

"Cool," Danny replied, grinning from ear to ear. "I always liked the no-gravity part. It just seemed awesome to fly around like that."

Sora blinked at this. "Seemed?" he echoed. That's odd. It's like he's done it before or something.

Apparently, Danny quickly caught himself and corrected his mistake. "Ah, well…it still does. I guess as you grow up you get less…I dunno." They reached the top floor of the house and he began pointing to various doors. "Mom and Dad's room is down the hall. Jazz's room is the door next to it. We're not really allowed in those rooms. Over here is my room." On cue, he pushed open a door. Inside was a relatively clean room; with several posters of space ships and other planets, a small bookshelf to the left, a computer situated neatly on the desk, several model rockets (there was one carefully displayed next to the computer that had apparently been smashed and reassembled before), and the bed was conveniently situated next to the window. A basketball was stuffed into a corner, but it was apparently not good for much more than gathering dust.

Sora almost laughed. It was loads cleaner than his own room back at Destiny Islands.

"We don't have a guest bedroom," Danny said, wincing noticeably as he spoke and eyeing a rolled-up sleeping bag on the floor, "So Mom and Dad are having you sleep in my room. I hope you don't mind or anything…"

"It's fine," Sora replied, smiling hopefully and kneeling next to the sleeping bag, placing his backpack next to it. "I've slept in some pretty odd places before. This is actually a pretty welcome sight."

Danny smiled awkwardly. "Wanna see the rest of the house before Dad comes in ranting about a new invention?"

Sora grinned, chuckling. "He does it that often?"

"Like you'd never believe," Danny replied. "While we're at it, I might as well show you where the lab is in case you need to go looking for someone and we're not upstairs."

"Lab?" Sora echoed. He had been to a certain scientist's labs before, and both had been quite well-concealed. Whatever the large metal building was on top of their house couldn't have been a laboratory; it was too easily exposed.

Danny stiffened a bit, but eventually nodded. "Yeah. Mom and Dad have a lab in the basement. Come on."

The keyblade master obediently followed Danny down the stairs once more. After climbing those, Danny led him through the house to another staircase (pointing out the living room and the foyer while passing). As they descended, Sora became aware of the walls becoming some sort of metallic structure. After a short descent, Danny pushed open a large, metal door, leading into a large room fitted with several tables, which were covered in beakers, a number of strange gadgets, a thermos, and a good number of papers. At the far end of the lab, however, was something that caught Sora's undivided attention: a large, cylindrical shape in the wall. It apparently was some sort of doorway; it was shut tight by a pair of black-and-yellow doors. There was a small control panel to the right of it, with three small dials but, ironically, no power switch. Sora gestured kindly toward the object. "What's that?" he asked.

The dark-haired boy next to him followed his gaze until he found out where Sora's attention was. "Oh, that?" He began, a hint of anxiety in his voice. "It's the Fenton Portal." He walked casually up to it, crossing his arms. "My parents built it a while back. It's supposed to be some sort of portal to the Ghost Zone."

"Does it work?" Sora asked, curious.

Danny chuckled knowingly. "Does it ever," he replied. "It lets ghosts into down every so often, and not all of them are friendly. They stuck the power button on the inside of it, so there's no real way to turn it off without unplugging or damaging it now."

At this, Sora furrowed his eyebrows. "How'd it even get on in the first place?"

There was an odd moment of silence before Danny shrugged. "Whatever happened, it's on now. I wouldn't get too close to it if I were you; it's a pretty dangerous piece of machinery."

Later that night after everyone else had settled in, Sora and Danny were just starting to get ready for bed. Sora had insisted on taking the floor when Danny had done his best to insist upon hospitality, but eventually the two had decided to alternate on who got the floor and who got the bed, and Danny won the bed that night. Thankfully, Sora was quick to nod off when it came to a sleeping bag, though that could probably be attributed to his high adaptability that he developed over the past two years.

He was also a very light sleeper.

An odd rustling caught Sora's attention past midnight, and he sat upright nervously. It took a while to adjust to his surroundings, but once his memory set in again, the only thing he found startling was the fact that the bed next to him was empty. He probably had to use the restroom, Sora reasoned. He was about to head back to sleep when he caught a strange shape in the sky through the open window.

It was a boy…or at least something similar. Sora could make him out clearly enough: there was a black suit of some sort, white hair, and an ethereal glow around him. Rather than legs, he had a spectral tail behind him as he flew about, making circles and loops in the sky. It was an odd sight to behold, but still somewhat peaceful.

It's not a heartless, Sora confirmed, And definitely not a Nobody. I've already dealt with enough of both to know if there's one around…so what is that?

Whatever it was, it was certainly content. The moment of peace, however, didn't last long; it spotted Sora and stopped in its tracks. A moment of awkward calm passed before the figure shot out of sight. Sora leaned out the window to see where it had gone, but to no avail. The figure was gone.

It was moments later that the bedroom door opened and Danny walked in, looking a bit more awake than he should have. "What're you doing up?" he whispered.

"I thought I saw something," Sora replied. "I think it was a person. A kid, actually…he was flying, but when he saw me he took off."

Danny made his way to his bed casually. "Probably one of the local ghosts," he replied, as though it happened every day. "Assuming you don't leave by the end of the week, it probably won't be the last you see of them." With that, Danny went right back to sleep.

Now with something to think about, Sora slipped back into his sleeping bag and stared at one of the many posters on Danny's wall. He had seen a ghost outside the window. Not a Heartless, not a Nobody. A ghost. And yet here this boy was, acting completely normal as though it happened all the time.

I can understand if it's commonplace around here, the keyblade master thought, But his parents are ghost hunters. Wouldn't he have some sort of hatred for them or something, or at least fear?

Though the questions were still in his mind, Sora eventually fell asleep. He could ask around tomorrow after school.

So...good? Bad? Completely lacking of continuity? (I tend to do that every now and then.) This has got to be my longest first chapter EVAR, by the way...three thousand words, WHEW.

I realize the majority of this first chapter is in Sora's point of view. We'll have more Danny love very shortly, everyone! I promise! (hides)