A/N: So this intro takes place in the first chapter of Order of the Pheonix. Post Phantom Planet. Sorry ahead of time for some of this being almost a fun-house mirror of "Demented Dudley", I really felt like there was no other way to start it.

Disclaimer- Yeah, I own nothing.

Ghost on Dementor

Harry could feel them.

Even as he lay there, face down on the ground from Dudley's blow to his head, he knew they were getting closer. He didn't even need to look up.

He could feel them taking away the light, the happiness.

He could feel the dementors.

"You moron, Dudley!" Harry shouted as he got to his knees, and frantically felt around in the darkness for his wand. Harry heard Dudley running away, rattling the alley fence as he stumbled.

"DUDLEY, GET BACK HERE! YOU'RE RUNNING RIGHT AT IT!" As much as he disliked his cousin, he couldn't let him suffer a fate worse than death from the dementors.

There was a terrible squeal, and his cousin's footsteps stopped. Harry felt another chill travel up his spine, and heard a rattling breath a distance behind him.

There was more than one.

"Dudley, keep your mouth shut! WHATEVER YOU DO, KEEP YOUR MOUTH SHUT!" Harry yelled as his hands frantically crept along the ground. "Come on, where are you— come on, please— Lumos!"

Harry said the spell in desperation for the light he needed, and in a shocking relief– a bright light shone only inches from his right hand. Harry snatched his glowing wand, got to his feet, and rapidly spun around, only to stumble backwards when he saw the towering, hooded figure gliding towards him.

Harry raised his wand.

"Expecto Patronum!"

An unimpressive silver wisp of smoke came from the tip of the wand, and only seemed to slow the dementor down.

The spell hadn't worked properly.

Harry lurched backwards has he tripped over his own feet.

The dementor was getting closer. A pair of slimy, gray hands slid from inside its robes, reaching for him. Panic was overtaking him.

Concentrate!

"Expecto Patronum!"

Another wisp of vapor shot from his wand, only slightly larger than the last.

The spell wasn't working.

The dementor was upon him. It's icy fingers circled around his throat.

Shrill, high-pitched laughter echoed in his head. It was growing louder, and louder as the dementor's faceless head grew closer to his own. A voice spoke inside his head — "Bow to death, Harry…. It might even be painless…. I would not know…. I have never died…."

This was it. The end.

He was never going to see Ron and Hermione again…

Their faces burst clear as day into his mind as he fought for another breath.

"EXPECTO —"

His spell was interrupted by a large roaring noise as the dementor was pushed back by a blast of green light. Harry looked at the recovering creature in shock.

Did someone just use the killing curse on a dementor?

"Woah there tall, dark, and ugly," Someone spoke up from Harry's side. To his surprise, he saw a black and white clad, glowing, floating teenager with his arms crossed, not much older than Harry by the looks of it. He had strange, bright white hair, and vibrant green eyes. His presence illuminated the alleyway.

"How about you lay off these kids, and keep this between you and me, eh? Ghost on ghost." The self-proclaimed ghost boy challenged the dementor with a surprisingly confident half smile.

Ghost on ghost? Surely this being was magical since it could see the dementor, shouldn't it know this was not a ghost? And Harry had never seen a ghost so… Solid before. Besides Peeves. And he's never seen one cast a spell—

The dementor moved faster than Harry knew was possible, and was on the ghost boy in an instant.

"Hey!" The teen yelled as it grabbed him by the throat. It's hooded head moved up and down the ghost, as though it was confused. The boy struggled to get free from the creature.

The same burst of energy spread through Harry again as he pointed his wand at the dementor.

"EXPECTO PATRONUM!"

A brilliant, silver stag erupted from Harry's wand, and charged at the dementor. The patronus' antlers struck the dementor in its torso, and vaulted it away from the ghost.

Now it was the ghost boy's turn to be in awe as the stag chased the defeated dementor away.

"What— how?" The ghost continued to stare at the patronus. Harry ignored the baffled ghost.

"This way!" Harry shouted and ran towards the end of the alleyway, the stag in tow. "DUDLEY! DUDLEY!"

"Right," The glowing teen got a grip on himself. "There were two of you— and two of them." He followed Harry, and it was only a dozen steps ahead that they came across Dudley, and the cloaked figure crouching down towards him.

Before Harry could even react, the ghost slammed into the dementor, sending them both flying back. The dementor didn't even get a chance to recover when it was blown back by another blast of green energy that seemed to erupt from the ghost's fingertips.

Not a spell was muttered.

The blast sent the dementor floating into the air, and soon it was engulfed in the surrounding darkness of the night sky.

As soon as dementor was gone, light had returned to Magnolia Crescent. Streetlamps flickered to life, stars began to twinkle again, and the Moon was as visible and vibrant as ever. A warm breeze swept through the alleyway, rustling trees in the neighborhood, and cars seemed to be driving through once more.

Dudley was on the ground, curled up and whimpering as he shook.

Harry looked up at the floating being, who was looking around at their now lit surroundings.

"Thanks." He told the ghost, truly grateful for his help.

"Yeah, don't mention it." He landed on the ground and stared at the wand in Harry's hand, then looked up to his face. "Now, before you ask: Yes. I'm the Danny Phantom." He told Harry in an exhausted fashion, as though he was asked this question a lot; but Harry didn't have the slightest idea who he was. Maybe he was famous in the Muggle world. "And I have a lot of questions for you."

Danny looked down at the shivering Dudley.

"But first, let's get a move on getting you two home." They both crouched down to check on Dudley, but then they heard loud, running footsteps from behind them. Danny was the first to stand back up while Harry instinctively raised his wand; they both spun to face the newcomer.

Harry instantly recognized the old woman as Mrs. Figg, the old cat lady that lived next door. She came panting into sight, her grizzled gray hair showing from underneath the hairnet on the top of her head, a shopping bag dangling from her wrists. Danny put his hand up and waved at the woman.

"Everything's alright over here ma'am," Danny said. "Just a bit of a ghost problem, it's all been taken care of."

Mrs. Figg was completely ignoring Danny. Harry started to tuck his wand into his pocket—

"No, no, don't put it away, idiot boy!" Mrs. Figg yelled. "What if there are more around? Oh, I'm going to kill Mundungus Fletcher."

A/N: Sorry about the short chapter, hopefully there'll be more in the next.

Let me know what you think!