Some things you should know:

This story is basically a mix of Supernatural, Avatar the Last Airbender, and Naruto. I've only taken characters from Supernatural. From Avatar I took the idea of people being able to bend one of the four elements (water, earth, fire, air); the avatar doesn't exist. I took the political system of this AU from Naruto; i.e. the shinobi villages and whatnot.

So basically, if you've seen either of these other two shows, you might be able to imagine this world a little better. However, if you haven't seen them, that's perfectly okay. Because I'm taking random elements from each of the stories, I'll explain everything. So don't feel like you can't read it because you don't know the other shows.

That being said, please notify me if something I've written doesn't make sense. Sometimes when I'm writing I assume people will know what I'm talking about. So if you read something that doesn't make sense, or have any questions about the layout of this world, please tell me!

One vocab term you should know:

Shinobi: A bender trained in the art of combat.

Now that I've rambled long enough, enjoy the story!

The signal was given and they all made their move. Reaching behind him, Dean grabbed the ninjatō from his back, pulling it from its sheath. He swung himself down and crashed into a window, entering the room. Immediately he grabbed ahold of the closest person, covering his mouth with one hand and slitting his throat with the ninjatō in the other. He was able to take down another shinobi by stabbing him in the side, in a vital point, before the others in the room got over their initial surprise and attacked. It only made it easier that they came at him. He swiftly cut down two more shinobi that charged at him before they figured getting close to him was a bad move. A torrent of air was sent at him, which he quickly dodged. He threw his ninjatō at his opponent, who was able to dodge it with ease. Dean didn't expect it to hit, it wasn't a throwing tool, but it served its purpose. The moment the Air shinobi became distracted by the thrown weapon, Dean quickly threw the stone dagger from a sheath on his leg. It tore into the shinobi's neck, and he fell to the ground immediately. With a flick of his wrist, the stone dagger sailed back into his hands. He threw it at his next victim, who dodged it and sent a blast of air at him. He dove out of the way of the blast then flicked his wrist once more. The stone dagger dislodged itself from the wall and came zooming back to it's owner. However, it didn't make it that far; Dean's opponent fell to the ground, the dagger protruding from his back.

When the last body hit the floor, Dean scanned the room for the stolen plans. Noticing a table with multiple scrolls on it, he shuffled through them. He found the scroll detailing his village's security plans and took his lighter out from his leg-pouch.

"Hey, I got it," he said to Gordon, destroying the scroll with fire.

"That was easy," Gordon remarked callously.

"Don't get cocky. These were just Intel shinobi." Their success was a mixture of Intel shinobi not specializing in combat and that they were taken by surprise.

"I'm aware. And you're the last person to lecture me on getting cocky, Winchester."

Dean dropped the flaming scroll on the pile of other scrolls, destroying as much of their information as he could. He hoped that the fire from that would be large enough to burn the whole room down, erasing their presence. The fire would also be a good distraction for them to make their escape. Walking over to his ninjatō on the floor, he picked it up and wiped the blood clean with his sleeve. Sheathing it, he flicked his wrist and his stone dagger pried itself from the dead body and flew into his hand. Reinserting into the small sheath on his leg, he felt a small satisfaction that he didn't lose any of his weapons.

He was about to call the mission a success when a soft sniffle came from behind. Walking slowly into the room was a boy, no older than 10, holding a dagger in his shaking hand. Tears were streaming down his face as he looked around the room at all the bodies.

"Stupid boy," Gordon remarked, walking over to the kid. The kid's eyes widened and he tried to back away from Gordon, but tripped over his own feet. He fell to the ground, any courage he held previously had vanished; pure fear was written across his face. Gordon pulled the ninjatō from the sheath on his back and swung his arm down to make the final blow.

Dean quickly caught the arm as it descended. "The hell are you doing?"

Annoyance flashed in the eyes of the man before him. "Our mission. We were told to kill everyone in the building. There are no exceptions."

"He's just a kid."

"Orders are orders. Now release me."

Dean gritted his teeth. "There's no honor in killing a kid. Leave him and lets move on. He's no threat to us."

"Dean. Emotions must be set aside during missions, you know this. There is a purpose behind our orders, and not following them could lead to the harm of our village or nation. Tell me, where is your honor then?"

"...I'll say this one more time. Leave the boy." Gordon didn't respond, only continued to look at Dean with eyes of cold indifference. Dean's eyebrows furrowed together as his anger grew. "If you don't sheath your weapon, we're going to have a problem. The enemy should already be on their way here; we don't have time for a problem."

Castiel peered through the binoculars at the intruders on the top of a building. He gripped them tight in anger and grief as he beheld the scene before him. These two shinobi killed everyone in the room. What confused him was what they were still doing there. One was holding the weapon hand of the other... Were they fighting? But why... Scanning the rest of the room he saw no one left alive.

"Take them out."

Dean was finally able to garner a response from his comrade.

"You would jeopardize the mission for this Air Nation underling?" he spat.

"This is between us and the Air shinobi. He's not a shinobi, and he's not old enough to defend himself."

"He will grow to be one, though. It's only a matter of years before he is sent out on missions."

"You can kill him then. But for now... The boy lives. We still have time to complete the mission and get out of here. Drop it."

Now Gordon was truly angry. "You ask me to go against the word of the Tsuchikage? Dean you-"

He was unable to finish his sentence. Faster than Dean could even see, a kunai knife tore into Gordon's back, piercing the heart on the other side. Before his body hit the floor, Dean immediately pulled back in attempts to evade a similar fate. His reaction was quick, but not quick enough. Another kunai with unbelievable speed bore into his arm. He let out a scream of pain as he could feel the knife dig deep into his upper right arm. He cursed his slow reaction, yet in the back of his mind he knew they had aimed at a vital point, and that he was lucky to be alive. He dodged to the floor as fast as he could, then heard another whoosh above him. He looked up and saw another kunai sticking out from the wall. His eyes widened when he saw the paper bomb attached to it.

The kid!

Castiel observed the scene as it played out. The first enemy was taken down immediately, they had the element of surprise for him. The second was hit in the arm with one of their blades, but was still alive. Out of the corner of his eye he saw a paper bomb being lit, then thrown attached to a kunai. Just as it left the Air shinobi's hand, the intruder dropped to the ground, revealing a child huddled on the ground. Castiel's eyes widened with shock.

"Stop the attack! There's a child in there!" But it was already too late. Castiel's heart stopped as he watched the knife hit the wall, the paper bomb seconds away from exploding.

Dean sprang across the floor and pulled the kid as close as he could in attempts to shield him. With a swoop of his arm, the rocks from his leg pouch came flying out and began forming a make-shift shield between him and the bomb. But there wasn't enough time. The unfinished shield was able to absorb a good portion of the blast but not all of it. He was thrown across the room from the force of the explosion, keeping a strong hold on the kid. He attempted to get up but immediately dropped to the ground with a gasp of pain. He was undoubtedly burned in several areas. Panting he looked to the kunai still in his arm. It was bleeding badly but he would only loose blood at a quicker rate if he took it out. He could still use it, but it hurt like hell.

He needed to get out of the building though. Not only was it on fire, but reinforcements were bound to show up at any moment. He picked up the kid with his good arm and jumped out the window. Gritting his teeth, he used his injured arm to raise a section of the earth below. He stumbled a landing onto the raised platform and then lowered them to the ground as quick as he could without hurting them. With that he let go of the boy, there was no threat to him anymore. The explosion itself should have been enough to rile all the villagers. If he didn't get out of here immediately he would be done for.

Where the hell was Sam? He and Andy were supposed to be keeping a lookout for enemy attacks. Sam wasn't stupid though. When he saw the explosion he would know to get out. His best option was to meet up with him at the rendezvous spot and get the hell out of the Air Nation.

So he ran. There were several alarmed villagers that shrieked in surprise at seeing him, but none of them were shinobi. Suddenly from the corner of his eye he saw a man running parallel to him on the rooftop. He confirmed he was a bender when a torrent of wind was sent at him. He easily deflected the attack, raising a shield from the ground. Raising his palm, he sent dust particles from the earth into the air, creating a smoke screen. He knew the airbender would be able to blow it away quickly, yet all he needed was a second to escape. With a stomp of his foot and the push of his hand, a hole formed in the ground. He jumped in it quickly and covered it up.

He began to make a cave heading for the outside of the city. Digging underground was a last resort technique for a reason, however. Not only did it take a lot of energy to do, but his time spent underground was limited. There wasn't enough air for him to be down there for more than a couple minutes while exerting this much energy, and still function properly. Using a good portion of his strength, he burrowed his way out. There wasn't a whole lot of room to put the earth he was moving aside; the ground was compact enough as it was. He only hoped he wasn't cracking the surface, leaving a trail to where he was.

Annoyed by the stifling confines his shoes brought, he placed his hand on the wall of the tunnel and focused. His feet were better able to pick up the vibrations of the earth, but his hand wasn't a bad substitute. Satisfied he was far enough away from the village, he pushed the ground upwards. As he surfaced he took a deep, desperate breath of the fresh air he was previously denied. Panting from exertion, he slumped against a tree to catch his breath, grimacing as it made contact with some of his burns. He was in bad shape and he knew it. With a final deep breath, he picked himself up and quickly began making his way to the rendezvous spot.

A sigh of relief escaped him when he saw Sam there waiting for him. However, his initial relief was dampened by grim realization. When Sam saw him, his brothers eyes widened with shock.

"Where's Andy?" Dean asked, already knowing the answer.

"They pulled a sneak attack from behind. Andy didn't make it." Sam looked down sadly. But now was no time to dwell on such things. He looked up to his brother, assessing his injuries. "God, Dean are you alright?"

"Never better," he panted out. He reached down to grab his backpack from the ground; Sam must have retrieved them while he was tunneling his way out.

Dean knew that Sam would be able to see through that one in an instant. He was right. He didn't object when Sam came over and put his uninjured arm around his Sasquatch shoulders so Sam could support some of his weight; Dean knew he was in bad shape.

"Let's just get the hell out of here."

"Don't have to tell me twice," Sam agreed. "The airbenders aren't going to let us get away that easy."

An exhausted chuckle escaped Dean. "You call that easy?"

"Right...Sorry."

"Just make sure to stay under the cover of the trees, they have all of the sky to look for us."

"I know." He cast a worried eye to his brother. "What happened?"

"Got caught in a paper bomb. Then I had to tunnel my way out of the village."

Sam looked at him angrily. "A tunnel? Damn it Dean, that was reckless."

"Skip the lecture Sam," he snapped back.

Castiel clutched his glider as he flew thorugh the woods, scanning for the Earth shinobi. Bending the air underneath his glider became second nature to him by the age of 12, so he didn't even have to think about it as he weaved his way through the trees. Finally spotting the Air shinobi that gave him the signal, he quickly landed on the tree branch next to him.

"Update?" he asked, getting directly to the point.

"There's two Earth shinobi directly ahead of us heading toward the Earth Nation. I've already sent out an ambush squad to take care of them."

"...No."

His comrade startled. "But-"

"Capture them. I want them alive."

This is just the prologue to the story, I was curious to see how many people would be interested in it. So please review, let me know if this is something I should continue to work on! Also, again, let me know if you have any questions. Thanks!