Disclaimer: I do not own the characters, only the story. ATLA belongs to Nickelodeon and Avengers belongs to Marvel. I apologize for any errors in grammar and/or if I was not accurate in reference to something.

Chapter One: The Return

Katara: Soldier, mechanist, god, spy, archer, monster

(One by one, six figures do something to show off their skills: the soldier blocks an attack with his shield, the mechanist has armor envelope him and then uses the repulsor on his hand to blast something, the god holds a powerful hammer high to summon a bolt of lightning, the spy drops down from above and displays a few moves, the archer rolls across the ground and fires a few arrows, and finally the monster comes down from a jump and smashes his huge fists on the ground.)

Katara: When these heroes come together, they can do many great things.

(All six of the heroes stand in a spinning circle as they are surrounded by villains and arch enemies)

Katara: Working together they had saved their world.

(The team fights against an army of alien warriors in a city as a portal swirled open above them. The portal closed and the alien soldiers dropped to the ground.)

Katara: Soon, the heroes will journey to save another world.

Unknown World (January 1, 2014 10:00 a.m.):

The shifting black sands did as they always have on an unknown planet. Every-thing was quiet except the winds whipping by. Even a newly demolished space ship was quiet of any sound. But then the sound of groaning, could be heard from underneath the space craft. The being underneath the wreckage could do nothing as he lay there.

Suddenly across the dark plains of the Dark World, a blue portal opened. From out of the portal stepped a figure clad in a black robe, black tunic with a glowing symbol of a skull with tentacles on the sides and bottom of it, black pants, black gloves and black boots. But was most noticeable of this individual was that his entire head was red, and looked as if it were a skull. For indeed, this individual was known as the Red Skull, the man that once led the fearsome organization of Hydra.

Every day since his exile, the Red Skull had thought about when he had been exiled from the Earth by the Tesseract. At first when he had touched it, he thought that he would have immediately died. But all the Tesseract had done, was send him to another world. A world that he thought that would be perfect to start over. But he knew that he wouldn't be able to take over it without some assistance. Using what ever power of the Tesseract was left within his being, he brought himself back to Earth and found someone from his past. That person was more than willing to help Johann Schmidt to find more help than he could hope for. Right now, Johann was finding the first recruit.

After he stepped out of the portal, a group of Hydra soldiers, their faces and bodies hidden under masks, walked through with something under a tarp while on a bed with anti-gravity repulsors. Whatever was underneath the tarp was big.

Big enough to give this recruit just the edge he will need, Red Skull thought to himself. Turning to the soldiers he said in his German accent, "We should hurry and get him inside. I want to get to our next target before the day is up."

The Hydra soldiers nodded in compliance as they rushed over to the space ship with the thing covered with the tarp. The Red Skull turned to look over the horizon and said to no one in particular, "I should hope that the doctor is finding those were on his side of the list. The body that we designed from one of those robot parts from that rich boy should be able to get him far."

(Upbeat Music plays as the title slowly plays)

The AVENGING AVATAR

The Raft (January 1, 2014 10:30 a.m.):

The Raft was a place for the worst kinds of criminals on Earth, from major terrorists that were caught alive, to the occasional super villain. Its location was a mystery to those who didn't know the secret workings of the government. But two inmates were in cells close together. Justin Hammer, the corrupt business man who once employed the Ivan Vanko, the son of a former scientist who worked with Howard Stark on the Arc Reactor, and had tried to use illegal means to try and out stage Howard's son Tony Stark, but a double cross from Whiplash caused his downfall. The other inmate of the Raft was once a normal soldier, but when he got the taste of a power that made him stronger than most other men, it literally turned him into a big green monster. Sergeant Blonsky, now by the name of The Abomination, hung on the wall with special restraints as he kept thinking of his defeat at the hands of the only man, or monster that could match his strength: The Hulk.

Both inmates could only stare and think about how much they wanted revenge on those who defied their goals. But as they continued to do not really anything in their prison cells, an alarm went off all over the prison. The sound of the blaring alarms made them look out of their cells.

A robotic body made its way through the Raft. The robot didn't have a normal robot's head, this head was actually made of a special screen to show a man's face with dark glasses and on the body of the robot, a skull with four tentacles swirling to the robots arms and legs decorated it. Any resistance it met was quickly taken out by the stun blaster in the robot's hand. The robot came to the control center of the prison. It tried to open the door by its handle, but the alarm must have triggered the locking mechanism for the outside. The robot raised its fist and smashed it through the glass of the door. It took two blows, and on the second try the robot's arm went through. Feeling around, he grabbed the handle and turned it downwards. The robot pushed the door open and walked over to the console. Looking around it found the buttons he wanted. Pushing the buttons, it let out all but two of the prisoners.

As the other prisoners escaped their cells, the robot made its way out of the control room and to the last two cells. As a guard ran up to the robot to stop it, the robot raised its stun blaster and knocked the guard unconscious. Looking down, the robot saw that the guard had a key card. Reaching down the robot tore the key card off of the guard.

With the key card in hand, the robot continued to the cell block where the cells weren't open. It soon came before the two cells and turned to both of the occupants and said in a computerized male voice, "Greetings, gentlemen."

"Who are you?" Abomination asked in his deep voice. The robot turned its head to the monster and said, "I am Arnim Zola, once and still a great scientist of Hydra. And I am here to present you an opportunity."

"What kind of opportunity?" Justin asked as he came near the bars of his cell. Only slightly did Zola turn his mechanical head and said, "Ze opportunity of revenge and to do what you please."

This brings a smile to both villains faces as Abomination says, "I think believe we're both in."

Justin Hammer nods in agreement as Zola brings up the key card and said, "Excellent choice, my comrades."

Zola swipes the card through the slot to Abomination's cell and the door opened as the shackles keeping the monster suspended released him. As Abomination tore down the cell, Zola swiped the card through the machine to Justin Hammer's cell. The door opened and the business man stepped out. But before the three could go anywhere, more guards appeared in the hall. Just as they were about to attack, Zola turned to Hammers and said, "My employer and I have something that you may enjoy."

Justin was about to ask when something came barreling down the hall. It looked to be some form of metal armor. The armor was black and red in most places while on the suits chest was the same skull logo, only this one was with tentacles from three sides and smaller in design. The armor blasted the guards off of their feet. Landing next to the trio, the suit opened up so that one could step inside. Zola motioned for Hammers to step into the suit, "Zis is vhat you have always vished for, yes?"

Not wasting a moment the former business man jumped into the suit. Upon entering the suit, it closed to where it completely covered Justin. As soon as the face plate closed, he turned to his new comrades and said, "After you I should think."

With that said, all three of them started running for the exit. They were stopped by a sight before them: what appeared to be a small group of robots, six in total, acting as back up security with guns that . Zola threw away the stun blaster, knowing it would be useless to him against these automatons. Zola looked to his comrades and said, "Show zem vhat you can do."

All three escapees jumped at the robot guards and fought against them. Two of the guard robots tried to push Abomination back, but they were both soon pummeled into the ground by the monster's fists. Using his repulsor blasts, Justin Hammers blasted his two into scrap metal. Zola used his robotic body to avoid the gunfire from the two final guard robots as he got closer to them. He jumped up on the ceiling and quickly crawled along it to reach the two robots as they tried to shoot him as he got closer.

When he was over them, though the bullets hit the metal ceiling they didn't appear to scratch the Hydra scientist he made sure to avoid the bullets. Zola dropped down between the robots and grabbed them by the heads and smashed the robots together. As the no longer functioning robots hit the floor, Zola looked to the other two and said, "We are nearly there, gentlemen. I have our ride waiting."

The three kept running through the halls of the raft until they reached a dead end wall of the prison. Making sure that his comrades stood back, pointed his left arm to the wall and the hand and wrist parts of the robot body turned into some kind of launcher. Without turning his head, Zola said, "You may vant to hold your breath if you can."

Not waiting to see if they did, Zola fired the rocket from his weapon at the section of wall. Upon impact the rocket detonated and water rushed into the compound. As the water started to flood the Raft and submerged the group, Zola motioned for the other two to follow him. Abomination didn't hesitate to follow the robot doctor through the hole, but Hammers stayed back for a second.

Might as well, Justin thought, I helped them get this far.

Without another thought, Justin Hammers propelled himself out of the flooding prison.

As the three made their way away from the prison, a giant submarine came into view. It looked to be a submarine that was designed to look like an old World War 2 sub, but on this submarine the same logo. A hatch on the sub opened up. Look-ing back, he motioned his head for them to get in before swimming towards the open hatch. Both villains swam right towards the opening.

Once all three villains were inside, the hatch closed behind them and all the water that had come into the hatch was immediately removed. As soon as all the water was drained, Zola led them through the sub as the giant vessel began to move again. They walked through the hall and towards an elevator. Once Zola stood before the doors of the lift, he pushed a sequence of buttons. With a ding the elevator doors opened up to them. All three villains stepped inside and turned to face the closing doors. Once the doors had closed, Arnim Zola pushed another button to make the elevator go up.

The ride was going at a moderate rate, and the elevator music was certainly questionable. It sounded to be a current pop star, for whoever it was singing sang…

Female Singer: Who said, who said, I can't be Superman!

Both Abomination and the armored Justin Hammers gave Arnim Zola question-able looks. But all he did was sigh and said in his computerized voice was, "It was the idea of one of the Hydra soldiers. So don't look at me like zat, nor ask me any questions over it."

The elevator dinged when it reached to the intended floor. All three of them stepped out and were greeted by someone who had his back turned to them. Stepping forward, Arnim Zola gave a slight bow of his head and said, "The mission was a complete Agent Rumlow. Or should I say Crossbones."

The man turned around and allowed both Abomination Justin to see the man. Though his face was covered by a mask to look like a skull, the rest of him was dressed in military styled uniform while his arms had his gauntlets on them. Look-ing to Zola he said, "Excellent work Zola. The boss just informed me not to long ago that he found who he was looking for."

"Were you able to find HIM, not to mention ze our newest test soldier?" Zola asked him. Cross-bones nodded and said, "I gotta tell ya, it wasn't easy gettin' any of them. The test soldier needed convincing that they would indeed be getting a type of cut out of this, while the third needed a whole lot more persuasion."

"Yes, Hydra's greatest biological weapon does still have its/his flaws." Zola's robotic head nodded in agreement. Then he asked, "He is contained in a special holding cell, yes?"

Once again, Crossbones nodded to confirm. Just then a portal appears off to the side. The Red Skull stepped through, followed by the Hydra soldiers. Once they were a few good feet from the portal, Johann Schmidt looks back to it. All the assembled villains watch as something else comes through the portal. With each step it took, a loud and heavy stomp could be heard. The being stepped through the portal, revealing a giant suit of armor. The armor was silver like in color, spikes decorated its shoulders and bright orange eyes glowed under an angry looking glare. The Red Skull then turned to the others and said, "I trust that we have all been gathered?" Zola and Rumlow both nodded their heads to confirm, bringing a smirk on Schmidt's' reddened face. He then said, "Good. Now all that's left, is to go back to the world where I disappeared to, help those I found win their war, and then bring their armies back to help in the conquering of this world."

Abomination stepped forward and asked, "I have a question: what do we do about the newly formed group that this world knows as the Avengers?"

The Red Skull didn't say anything at first but moved to one of the many consoles. He closed his eyes and took a deep breath. Without turning to look at his new comrades, he said, "I have seen what Zola and Rumlow had showed to me of Captain America and his team. Though I doubt any one will notice my comings and goings on that planet during my mission, he will not doubt go to the Raft and investigate Zola's handiwork." He turned on a heel towards them and said, "But fear not. These 'Avengers' shall not be too much of a nuisance to us. They may become caught up in our plans, but they will not be a concern for long."

Looking out the window of the sub he said, "Trust me."

The Raft (January 1, 2014 11:30 a.m.)

The prison riot had nearly overran the guards of the Raft, and as the current five dozen armed prisoners had completely cornered the remaining staff into a corner in the mess hall, all hope seemed lost for them. Just as a prisoner raised a grabbed stun gun that he grabbed from a guard, a repulsor blast knocked the weapon out of the prisoners hand. The prisoner was bewildered for a moment, and when he looked to see what exactly what happened, he was knocked down by a flying shield. The shield bounced off of the prisoner, off of a wall and into the hand of its thrower.

The team known as the Avengers stepped into the Raft's mess hall. Six people stood shoulder to shoulder as they looked at the prisoners. The leader of the Avengers placed the red, white star and blue shield on his arm.

Captain America, real name Steve Rogers, the super soldier dressed in a red, white and blue suit. Standing on his left was a man in red and yellow armor, who underneath the armor was Tony Stark the billionaire who designed the Ironman suits. On Tony's left was a man who looked as if he was about to let loose a thousand pounds of angry. The gamma expert Bruce Banner let it all out of his anger as he quickly transformed into the Incredible Hulk, a green monster who gets stronger as he got angrier.

On Captain America's right stood a tall and really long blonde haired man in sleeveless Viking styled armor with a cap on his back. Thor swung his hammer Mjolnir in a circle as he smiled at the coming battle. On Thor's right stood a woman with long red hair and full black body suit. On Natasha Romanoff's, hips were two gun holsters while she had electro-sting shooters on her wrists. Finally on her right, a man with a bow that had an arrow at the ready. Clint Barton raised his bow and aimed it at some of the prisoners. Cap took a step forward and said, "Why don't you fella's make it easier on yourselves and just surrender."

"Heh, heh." A few of the convicts laughed. The prison staff quietly made their escape as one of them said, "I don't think you, 'Avengers' understand that we have you out numbered."

"You do realize that they have tangled with things bigger and more in number than us don't you?" The convict beside him asked. This earned him a slap to the face as the first convict. The first said, "Shut up if you know what's good for you!" Turning to his fellow prisoners he shouted, "Get them!"

Thor chuckled at this and said, "I was hoping they would choose the hard way." Looking to his left he said, "Tony, this means I win our wager."

"Uh, I still think that they should've just given up." Tony muttered from inside the suit. Nat groaned and said, "Can we just focus on the bad guys, please."

"She's right guys." Cap said. Readying his shield he said, "Avengers, take 'em down." He looked to his left he said, "Hulk." The green machine looked to the super soldier as the Cap said, "Be sure not to break them too much."

Hulk only smirked as he ran at some of the attacking prisoners. With a mighty swing of his fist, he swatted those prisoners into the wall. Just as some raised their blasters on the Hulk, Captain America used his shield to knock the weapons downward as he used it and his fists to give them a beat down.

He ducked under the swing and landed an upper cut on the prisoners chin. The blow sent the prisoner flying into a table. Cap readied himself against another, but this one dropped his weapon and laid himself down on the ground. Steve noticed that it was the prisoner who tried to make the others see sense before fighting. Deciding to give this man mercy, Cap ran past him to take care of the other prisoners.

Ironman made sure to move out of the way when a shot came at him as he ran forward. But when he got closer, Tony knew that he wouldn't be able to dodge, so he opened a compartment in his suit and fired half a dozen tiny rockets at his adversaries. The rockets landed a few inches from the assaulting prisoners, throwing them off of the game. It allowed Ironman to use his thrusters to ram into the two men. As all three fell to the floor, Tony did a roll over them and came back up on his feet. Standing up to his full height, Tony didn't turn around as another prisoner came running at him. Lifting a hand he used a repulsor blast that knocked the attacker off of his feet. Seeing that there were still more prisoners, he used his thrusters to rejoin the fray.

Thor swung Mjolnir at the oncoming prisoners who tried to use tables as shields. Each blow shattered the tables and sent the prisoners flying. Thor saw about ten attackers coming at him. With a smirk on the Asgardian's face, he jumped up into the air with hammer raised and brought Mjolnir down in full force. The impact sent a shock wave that tripped up the attackers. Thor looked over and saw that the Hulk looked to be having fun with his battles. With a war cry, Thor quickly joined the Hulk.

Natasha used the martial arts skills that she learned to defend herself from the prisoners attacks. On one prisoner she jumped up and wrapped her legs around the man's head and used her momentum to throw him to the ground. Quickly getting up, she had to duck under a swinging kitchen knife. Having to balance herself on her hands, Nat did a kick to the man's gut. It knocked the wind out of him as the knife fell from his hand. Bringing her wrists up she used her electro-stingers on the other prisoners. Just as she stood up, another prisoner tried to attack her from behind. Just as he was about to bring down a pipe, an electro-arrow caused him to spaz out down to the floor. Natasha looked over to see Clint giving her a thumbs up with a smirk. Smirking herself, she turned back to the fight.

Clint used arrows on the prisoners from a distance, but used fighting moves and his bow against those who got too close. A prisoner as able to keep up with Clint's moves. Clint was impressed at this guy as he blocked a downward stroke from the prisoners knife. Clint decided to use a move that the attacker wouldn't see coming, but he heard a yell come from behind. Moving out of the way, the running prisoner ran right into the other prisoner.

Each of the Avengers used their skills to fight off the remaining prisoners. Thor and the Hulk knocked the last two into each other. Once the fighting had stopped, the team regrouped with each other and rounded up each prisoner to tie them so they couldn't cause any more trouble. Once the Rafts guards came back into the mess hall, the Avengers took a step back to assess what had transpired.

Captain America turned to the others and asked, "So anyone know what happened here?"

"All the guards who weren't sent to the infirmary nor were killed said the Raft was broken into by some kind of machine." Nat said as she started to administer the 'lullaby' method on the Hulk. As he and Natasha placed the palms of their hands together, they moved their hands to where Hulk ran his fingers down her arm, and then vice versa. The 'lullaby' immediately takes affect as the Hulk groans and falls to his knees from the transformation back into Bruce Banner. His frame became smaller as the Hulk's huge muscles shrunk and the skin turned from green to white. When the transformation was complete, Bruce stood up on his own two feet as he held up his torn pants with his hands. Thor came up to him and handed the man some new clothes.

"As soon as we landed, I had Jarvis look into the security footage." Tony said as the helmet of his suit retracted. Thor then said, "Well, whatever this threat may have been, it seems to have vanished."

One of the Raft's security guards came up to the team and said, "We wish to thank you Avengers. For without your assistance, things could have gotten a lot worse."

"Happy to help, soldier." Steve told him with a smile. The super soldier then asked him, "Do you know who attacked you?"

The soldier shook his head, but did say this, "All I know of the breakout was that the machine had some kind of weird design to it. But I do remember it from somewhere."

This increases the Avengers interest, as Nat asks him, "What was the design?" The guard thought about it really hard and said, "Well, the face of the robot was some kind of video based display, but the design on its torso was that skull with the tentacles on it."

This makes most of the team gasp as Cap and Nat's eyes grow wide as they shout, "Hydra!"

A/N: In this fanfic production, this takes place after Ironman 3, Captain America: The Winter Soldier and Thor: The Dark World and Avengers: Age of Ultron. Don't worry, there will be other heroes and villains in this fanfiction. However, I will not be giving any spoilers to future episodes. And even though in the Marvel Universe Thor's not really a god, I won't let it affect my belief in the one true God. All you guys need to know is that I will do my best to put my heart and soul into this fanfiction.