Because there aren't enough Danny Phantom/Supernatural crossovers, okay? There just aren't.
This is going to be a collection of oneshots, to be updated whenever a new idea pops into my head. Ratings will vary; I don't plan on hitting M any time soon, but if the occasion arises I will warn you. Genres will also vary. I will not be extending any of them into full-length stories, but you guys are free to continue one if you want to—just let me know, so I can read them! :D
First up, Sam and Dean meet Danny and Dani.
The Not-So Ghost Boy
Sam was the first to notice that a city in the Midwest, a run-of-the-mill and middle-of-nowhere town called Amity Park, had been experiencing some erratic weather that had even the best meteorologists on every weather channel baffled. First a drought that lasted so long it had the citizens verging on full-fledged panic, and now spontaneous electrical storms and sudden extreme fluctuations in temperature—fluctuations of almost fifty degrees in less than a day. Not to mention, only a week before, almost the entire town had been overrun by what the media was calling "an unexplained surge in plant life."
Most meteorologists, when asked about the situation in Amity Park, dismissed it all by saying that weather was a "constantly changing and unpredictable science," which of course Sam and Dean both knew to be complete and utter crap.
They knew—or at least, Sam realizes now, they thought they knew—what the crazy weather in this backwater town actually meant.
Demonic omens.
Now, of course, Sam is beginning to question that.
Maybe it's because his brother is pointing a shotgun at a teenage—maybe ghost, maybe not, but definitely not demon—boy, or maybe because five seconds ago that teenage boy had been shooting green lasers out of his palms. Maybe it's because that teenage boy is wearing a skintight jumpsuit straight out of the eighties, or because there is a preteen ghost girl in a similar jumpsuit hiding behind him.
Or maybe it's because the kid just won't shut the hell up, and as far as Sam has ever noticed, ghosts don't tend to talk this much.
"Look, I don't want to hurt either of you," the kid insists, and he shifts slightly so that he is completely between the ghost girl and Dean now, his arms tensed at his sides. Dean tightens his grip on the shotgun and aims it at the center of the kid's chest, and Sam almost tells him to lower the gun. Almost. The kid turns his head a little to the side and addresses the girl behind him, "Danielle, get out of here."
Dean opens his mouth and manages to get out the word, "She's—" before the girl speaks up.
"I'm not going anywhere," she argues, and Dean closes his mouth with the most absurd expression on his face because Sam knows that that is exactly what had just been on the tip of his tongue. She adds with an annoyed huff, "And I told you to call me Dani."
"You really are stubborn, you know that?" the boy growls at her, still not taking his eyes off of the shotgun in front of him.
"Why, because I won't leave you alone to face these two goons on your own?" she shoots back, and Sam raises an eyebrow. These two ghosts are acting like… well, they're acting like humans, actually, almost like siblings. The girl tilts to the side, peeking around her protective friend to get a better look at Dean and asks, "So what are you guys, anyway? Undercover Jerks-in-White or just some losers my dad sent after us?"
"Dani, don't—" the boy begins to intervene, but Dean speaks up before the kid can get another word in.
"I should be asking you that same question," he tells them both, and the kids give him a look somewhere between confusion and disbelief.
"You… don't know what we are?" the boy asks. "What, was the flying around and shooting ecto-blasts not enough of a clue for you?"
Dean scowls and raises the shotgun a bit higher. "If I were you I wouldn't get cocky with a shotgun pointed at my chest," he warns, and Sam has to physically bite his tongue to stop himself from pointing out that actually, yes, Dean, you would get cocky with a shotgun pointed at your chest. But that's beside the point, and Dean continues, "Now you seem pretty smart for a low-life creature of the night, so why don't you tell me what you are?"
The kid blinks and then cocks his head to the side as he looks Dean over, as if he's trying to debate what he should say.
Finally he opens his mouth and answers, "Danny Phantom."
"I'm sorry," Dean asks, "what?"
"My name is Danny Phantom," he explains. "And I'm not a what, I'm a who."
"Okay, then, Danny Phantom," Dean responds with narrowed eyes. "If that's who you are, then what are you? Because you are definitely not human, kid."
The kid chews the inside of his cheek for a second, and in between looking curiously at Dean he shoots a glance at Sam, who is startled for a second by how bright and green the kid's eyes are.
Dean's right, this kid is definitely not human… so why does he act like he is?
Danny Phantom switches from biting the inside of his cheek to biting his lip, and then he asks, "You guys aren't with the Guys in White, are you?"
"No," Sam speaks up, and the kid looks right at him. "Never even heard of them."
The girl speaks up then, and she asks them out of the blue, "Does the name Vlad Masters mean anything to you?"
"Vlad Masters?" asks Sam, and he wracks his brain for a second before answering uncertainly, "Isn't that the mayor here?"
"So you guys aren't with the Guys in White, and you're not working for Plasmius," the kid sums up without answering his question, and Sam is about to ask who or what 'Plasmius' is, but the kid continues before he can. He takes a step forward and says, "So I don't see why we can't be—AAH!"
The kid goes flying backward—he just came a step or two closer to Dean than he should have, and his reward was a chest full of rock salt—and he slams back-first into his friend, Dani, and they both skid across the floor a few feet before coming to a stop. The kid has his hand over his chest, and he's wincing.
Alright, so if he is a ghost, he sure is not a normal one. He didn't disappear on impact, anyway.
The not-so-ghost boy coughs, and he finishes his sentence with a little glare in Dean's direction.
"… friends."