Author Note:

So, this is my first fanfiction! It will be an epic, multiple way crossover, but that's later, now we will first focus on Harry Potter and Avatar: the Last Airbender. Time HP-universe is very beginning fifth book, ATLA-universe is episode Bitter Work, with some changes in the last two episodes. In this chapter Harry and Dudley find a mysterious stranger on their way home... Tell me what you think! Furthermore, this is my first story in English, so comments on language are also welcome (if your own English is good...). Enjoy the show!

"Don't point that thing at me!"

Suddenly the stars were darkened by large menacing clouds and rain started to drop down. The now frigid air sent a quiver down Harry's spine. It couldn't be… No, it couldn't. Dementors didn't cause rain.

"D-d-don't do that!"

"I'm not doing anything!"

"Don't do that!"

Harry groaned inwardly. Talking sense into Dudley was now the least of his concerns. Although he wouldn't show it -he loved making Dudley believe he could actually do something horrible to him- the change in weather made him nervous as well. The rain was raging down at the moment and it just wasn't supposed to be this cold, not on the hottest day of the year.

"We really should get home."

"Says who? You're the one who started this storm in the first place!"

"What! Why would I do that?"

"I don't know! Probably just a stupid trick so you can laugh at me with your stupid, ugly wizard friends." Apparently he still hadn't forgotten the Ton-Tongue Toffee incident.

"Listen! I've got no idea what is causing this storm and I don't have anything-"

CRAK-BOOM

A flash of lightning set the sky ablaze. Dudley made a sound most resembling a frightened pig.

BAM

Before Harry knew what happened Dudley's fist had slammed in his face and Harry landed on the ground, wand lost in the rain. While he searched for it on the pavement he heard his cousin running away.

Having put his wand safely in his pocket he ran after him, soon finding him blindly pacing down the road.

There would be a lot of yelling when they got back. Nothing he wasn't used to, but things could be hardly any worse. Unexplainable storm, a panicking Dudley, accusations of using his wand at his cousin, which weren't entirely untrue, in their eyes it would be all his fault. Fortunately there weren't dangerous men magically appearing out of thin air this time.

CRAK-BOOM! A thunderbolt struck the road a few meter ahead of a screaming Dudley. Harry ran forward when he saw…

Of course there would be dangerous men magically appearing out of thin air this time. Or out of lightning, to be precise.

As Dudley stood frozen in shock, staring at the boy who now lay face down on the sidewalk, Harry cautiously approached the mysterious stranger. The first thing he noticed was the terrible burn across the boy's back. Flaming red skin was visible beneath his torn and charred clothes, still glowing orange at the edges. Those clothes were pretty unusual anyway, grey-green, shabby and old-fashioned, like he imagined the clothes of a medieval beggar. That picture was completed by his lean body, yet he seemed quite muscular. Harry realised he couldn't be much older than himself. Dark hair, fair skin and there seemed to be something red on his face, another wound? He was nauseous with the idea what he might see, but he had to check if the teen was still alive.

"Don't touch him!"

Harry deliberately ignored this. He carefully turned over the boy's face and shrunk when a horrifying scar came in sight, but didn't step back. His eyes were half-lidded and there were no irises visible: unconscious, but still breathing.

Without further thought Harry heaved the boy by his shoulders and began dragging him to the house. He may not be strong, but the boy was surprisingly light.

"What are you doing?"

"I'm trying to bring him to our house." He glanced up at the large, fat, beefed-up figure of his cousin. "You could lend me a hand, you know…"

"Are you crazy, you don't know him, what do we have to do with him? He just appeared on the side walk, he may be a murderer for all you know, he probably isn't even human!"

"Then what do you want to do, leave him here to die?"

He had no answer to that. He reluctantly picked up the boy's legs and helped Harry carrying him home, fear and disgust written all over his face.

"I don't know what you are plotting, but I swear I'll beat the crap out of you when this is all over." Harry couldn't keep from rolling his eyes. Poor boy, after all that happened, he wouldn't get a warm welcome from the Dursleys.

Well, at least he wasn't a Dementor.

Can you guess who the mysterious stranger is? How will Dudley's parents react? What will happen when he wakes up? Who more will get involved? Read this and more in the next chapter...