I know this says its an Avengers Academy crossover, but's more of a Marvel Crossover. I only chose Avengers Academy because its the only one with the right character tag. But there won't be too many Marvel elements. Just a few that will be seen as the story moves on.

Anyway, I do own Fate Zero or Marvel. They are properties of their respective owners.

Please enjoy!

"Gogo? Why did you choose me to hold the Amulet?" The boy asked as he scratched Diablo's chin. The giant, red-skinned, theropod lizard released a chuckle-like noise from it's throat.

The Hag of the Pits opened her eyes to face her champion. The Hag had dark eyes, and white hair that contrasted with the black fur that grew around her dark-skinned body. The fur was a sign of her age, as she has existed long before the rise of Homo Sapiens. She would likely live long past them.

But right now, the Hag only cared for the boy. And he had asked a question.

"Because young one, unlike the warriors of the past, you hold an understanding that they could never achieve."

"What is it Gogo?"

"You are not enticed, and therefore not restricted by the glories and honors that they coveted. You understand the true meaning of life. You know it's true value."

"Is that why you chose me?"

"That and more, young one" The boys Gogo said. "One day, you will know why. You will know."

"It's ready Kiritsugu" Irisviel told her husband. They both stood within a chapel, one housed within the Einzbern estate. This was a sacred ground, one meant specifically for the summoning of Servants during a Grail War.

Which is exactly what was meant to happen tonight. Before the altar, both mages stood ready. One was dressed all in black, with a trench coat covering his suit. He was the designated master, and he was prepared to start the summoning. To his right was his wife, a woman clothed in a white and gold dress. She was meant to stand by his side and assist him any way she could.

Upon the altar stood a gold and blue scabbard, one covered in the dust of a summoning circle. A relic meant to be be used as a catalyst to summon the correct heroic spirit. The greatest of the old Kings. The most powerful of the Saber class, the most powerful class.

With the help of King Arthur, victory in the Grail War would be assured.

"Are you alright Kiritsugu" Irisviel asked. Her husbands face seemed more worried than it usually did. And that was troubling.

"I know I am capable of summoning Saber. That is not an issue Iri" Kiritsugu said. "However, I am still uncertain if Saber is the right class for me. Honestly, Caster or Assassin would probably mix better with my style."

"That doesn't matter" Iri gently said. "You may have differing methods, but I am certain you two will be able to work together. You both have the same goal."

Kiritsugu offered a small smile at his wife's words. While he still had his doubts, he was truly unable to deter Iri's optimism.

Which would only make what he would have to do so much harder.

Pushing those thoughts aside, Kiritsugu stepped before the scabbard. He held out his hand, one that had three red marks, and began the ritual.

"I hereby swear."

"That I will be all that is good in this eternal world."

"I will be the dispenser of all that is good in this eternal world."

"Thou shall come under my command."

"So let thy sword be my fate."

"Abiding by the summons of the Holy Grail."

"If thou does accede to this will and reason, answer me."

The circle around the scabbard began to glow. The glow burst into a blinding flash of light and smoke. When the smoke dissipated, a new figure stood on the altar. A young woman with blonde hair and green eyes. She wore blue and white armor, and seemed to be holding something in her hand.

"The Servant Saber answers the call. Are you my master?"

Kiritsugu was momentarily confused. The incantation was supposed to summon King Arthur. But upon closer inspection, he realized that he had done just that.

"Yes. I am your master" he told his servant. He was acknowledged with a curt nod.

He turned to leave, when the unexpected happened.

The circle began to glow again.

"Kiritsugu? What is happening?" Iri exclaimed. She was clutching her left hand, which was now glowing red.

"Iri?" Kiritsugu didn't know what to say. Or what to do. This wasn't part of the plan. This shouldn't even be possible.

The glow from the circle was becoming stronger. It was much more intense then when Saber had been summoned.

The glow not only burst, but this time exploded with force. All those present, Saber included, were thrown back by the blast. When they rose, they could not believe their eyes.

A young man now stood where Saber had once been. He looked to be around seventeen, with naturally tan skin, messy black hair that reached to his ears, and golden eyes. His outfit was not like something Kiritsugu would have expected. He wore a black hoodie with white stripes printed around the chest and sleeves, two pockets in the front, and sleeves that reached his elbows. He also had on a pair of dark shorts that only reached a little past his knees, and had white stripes similar to the hoodie. He also wore no shoes. But he was not the biggest surprise.

The true shock was the creature behind him.

A ten-foot tall, red skinned, theropod lizard stood behind him. It stood on massive, powerful legs with dangerous talons. It's arms, while short, each had claws on two fingers that seemed like they could tear through flesh like paper. A tail, over five feet in length, swung in the air. It had a rather large head, with white razor fangs appearing from it's mouth. It's eyes, like the boys, were a golden color.

It looked like a dinosaur. A T-Rex, to be more specific. But why was it here? And who was the boy? How did they get here? And what had happened to Iri?

Kiritsugu refocused on the situation as Saber immediately stood in a battle ready position.

"Master! Your orders!"

Kiritsugu analyzed the situation. He didn't know anything about the boy, and he knew even less about the lizard. But they posed a possible threat. That was all he needed to know.

"Saber, attack them! Go for the monster first!" The lizard would be more difficult to deal with. It would be better to kill it quickly, and the move on to the boy.

Saber gripped something in her hand. To the uninitiated, it would seem that she was just grabbing air. But Kiritsugu knew exactly what she was holding. Her legendary weapon.

Saber rushed rushed forward, her weapon aimed at the creature. She was close, and about to strike the beast.

Until the boy appeared in front of her. One of his hands was used to grab her sword arm. The other was pulled back in a fist. Saber was about to respond, to break from his grip. But what she saw surprised her, and made her hesitate.

The the skin of the boy's arm changed color from a bronze tan to a scarlet red. The skin itself became more scaly, as well as thicker. It now resembled the skin of the beast behind him.

The boy threw his punch, and sent Saber crashing into one of the benches. The wood was reduced to splinters.

Kiritsugu watched in worry. The boy was capable of fighting one-on-one against a Saber-class servant, so he wouldn't be easy to beat. That only made him doubt his chances of beating the Lizard.

But he had to try. But Iri's sake. For Illyasviel's sake. For the worlds sake. He had to tear through any enemy, to ensure that peace would be bought. He took out his gun.

RRRRRROOOOOOOOOOOOOAAAAAAAAAAARRRRRR!

The creature let out a terrible roar. Likely a response to Saber trying to attack it. The roar made Kiritsugu stop in his tracks, and sent Iri back. Even Saber, though she wouldn't admit it, was unsettled by the roar. The lizard continued to growl at those present, only to suddenly stop.

The lizard looked down at the boy. The possible servant was gesturing his hands down. Was he telling the beast to stand down?

He must of been, because the lizard suddenly sat on it's tail. It looked much more tranquil that it had previously.

The boy then moved over to Kiritsugu, who reacted by pointing his firearm. But the boy seemed undeterred. He simply walked over to them, and focused his attention on Iri.

"Wh-Who are you?" Iri asked the boy. The boy responded by pointing at her hand. Iri gazed at it to see what he was pointing at.

What she saw baffled her.

On her hand were three red marks. Marks that seemed like a three-toed footprint. Marks that signified her as a Master.

"You-You are a servant? My servant?" Iri asked. The boy responded with a nod.

"That's impossible" Kiritsugu stated. "The ceremony was only meant to summon one servant. How did you come to be?"

The boy only shrugged.

"Do you speak?" Kiritsugu frustratedly asked, realizing that the boy had not said a word since appearing. He had not even asked for his master.

The servant did not answer. Instead, he then took out a piece of paper from one of his pockets, and handed it to Iri. Iri scanned the paper, before adopting a worried expression and handing it to Kiritsugu.

"Can you read this? I don't know the language" she said.

Kiritsugu read the paper, his brows furrowing in confusion. "Spanish? Does that mean he is a hero from Latin Legend? Perhaps. I may not have much experience with this language, but I can manage" Kiritsugu pondered as he read the paper aloud.

"My friends is called Diablo. Yes, he is a T-Rex. Don't kill him. And yes, I am the servant of Irisviel von Einzbern. My servant class is..."Kiritsugu had to stop to make sure he was reading correctly. "Avenger?"

The boy nodded.

Kiritsugu threw the paper in disbelief. "What game are you playing here? There are only seven types of servants. Avenger isn't one of them."

The servant narrowed his eyes, seemingly annoyed. He then started waving his hands around. What was he doing?

"He is trying to use Sign Language Master" Saber said, now stepping up behind Kiritsugu. "Servants are imbued with knowledge of the current world once summoned. That includes its languages. As I can understand him, would you like me to translate?"

Kiritsugu had very little experience with sign language, so he wouldn't be able to fully understand the boy. He nodded at Saber.

"He is saying that he himself is confused. But the Grail itself has told him that his class is Avenger. He is certain."

The boy made more signs. "He also says that he has no reason to listen to you. He was summoned to serve Irisveil."

The boy, Avenger, looked directly at Iri. When Iri saw his eyes, she expected to see the eyes of a dangerous predator, similar to his beast friend. But instead, she saw eyes that seemed full of life. They were intelligent, and seemed to carry a sense of fun.

"I don't think he is lying Kiritsugu" Iri told her husband. Kiritsugu warned her not to step too close, but she pressed on. She moved directly in front of the servant, holding out her right hand.

"I ask you. Do these Command Seals mark me as your master? Are you my servant?"

The boy smiled, and performed a small bow to Irisveil.

That settled it then, in the eyes of everyone. Another servant had been summoned, one in a completely different category.

Avenger was now a part of the Fourth Holy Grail War.

Suddenly, the doors to the Chapel burst open. Two servants of the Einzern family stepped in.

"Master Kiritsugu! We heard many loud noises. Did the summoning...?"

The servant stopped mid-question as her eyes fell upon the Dinosaur on the altar and the boy who was clearly not King Arthur.

"Master Kiritsugu, what happened? Should we inform...?"

"Tell Jubstachiet that there is nothing to worry about. In fact, the ritual went more than well" Kiritsugu said. "In fact, we have another servant, along with his familiar, whom we can use to win the Grail."

The family servants were shocked at the news, but nodded and left to relay the message to the head of the Einzbern family. Avenger smiled at being accepted.

"Avenger?" Iri asked. The servant turned to her. "I am not sure if it is appropriate to ask, but I was wondering who you are."

"As am I" Kiritsugu said as he put away his gun. Saber allowed her weapon to dissipate as she moved in closer. "What legend are you Avenger?"

The boy smirked. "You won't hear my story in any book" he signed, which Saber translated.

"Why not?" Iri asked.

"I haven't been born yet" he explained, shocking everyone present. "The year of my birth is 2095."

That was a bombshell. Avenger was only becoming more and more of a mystery. First he claimed to be of a class that shouldn't exist. Now he was from the future?

That would explain his clothes. And Heroic Spirits were able to be summoned from all points in time, so it was possible to claim one from a time that was yet to come.

But about the Dinosaur. They were supposed to be extinct now. How could he have one in the future?

"What about your T-Rex there? Diablo? How do you explain him?"

"He is my best friend. Long story" was all that Avenger. Kiritsugu wanted to know more, but he had to tread carefully. Especially with Diablo still eyeing them.

He would have to be patient for more answers concerning that.

"What about you Avenger?" Iri asked. "Can you tell us your name?"

Avenger took out another piece of paper. When Iri read this one, it was merely one word.

"Avez? That's your name?"

Avenger smiled, confining his name.

"I see. Well then Avez, why don't you and Diablo follow me? I'll show you the mansion, and where you can stay."

The Dinosaur lifted itself up at the mention of his name. It made a noise that sounds similar to a coo. What the beast happy?

Kiritsugu wasn't. "Iri, are you sure that is wise?"

"Don't worry Kiritsugu. I do not understand how, but Avenger is my servant. He won't hurt me."

And with that, Iri led Avez and Diablo out of the chapel. The T-Rex had to lower itself to fit through the door.

Kiritsugu eyes both Avenger and his pet suspiciously as they left.

Saber walked up to her master. "Master. Is keeping him around wise? Even if he is a servant, he may still prove to be a threat."

Kiritsugu sighed. Things just got a lot more complicated. He was already having doubts about Saber. But now there were two complete unknowns that just barged into the plan. A plan that would now need major revisions.

But for now, Kiritsugu would do what he could. He would have to report to the Einzbern family head, and tell him what had occurred. That would certainly be a cause for many headaches.

He would also have to keep an eye on Iri's servant, and his pet. If they did anything to present a threat, he would do everything in his power to destroy them.

But for now, he would treat them like the tool they are. He would find find out their abilities, and employ them in the fight against the other masters and servants. He would make sure to use everything at his disposal.

Speaking of tools...

"For now, just remain on guard Saber. Once the time comes to fight, I want you to be ready."

With that, Kiritsugu exited the Chapel, leaving Saber alone.

The Fourth Holy Grail War was shaping up to be very interesting indeed.

Hopefully you enjoyed the introduction. Now just to clear some things up.

Inspirations- As I said, Genndy Tartakovsky's Primal is major source of inspiration. The rating of the story will probably change to M later on to match the tone of that show. Especially as more backstory is explored.

Marvel is another obvious inspiration, with the characters here coming from that comic company.

There is also the real-life story of Marcos Rodríguez Pantoja, a boy who survived in the forest for many years living with wolves and mimicking animal sounds. His life story is really interesting, I would recommend checking it out.

There will also be some sprinklings of HTTYD, mostly with the bond between the boy and his dinosaur.

The main story inspiration from this site is neverendingZero's story The Einzbern's Hero.

Characters- None of these characters are OC's, just named differently from the comics. Devil Dinosaur is a Marvel Character. And the boy is a character from the comics as well. Humberto Lopez, aka Reptil, and the is the main character in this story. I don't use the name because he doesn't have it here. He was raised in the Savage Land, so no one gave him a human name, or a superhero name. The circumstances of his life are different, so he is different from the comics.

Names- Instead of being called Reptil or Berto, I am calling the boy Avez. I came up with the name after playing with the name 'Alvarez'. That's because Luis Alvarez is the man who came up with the theory of the KT Event. It seemed fitting to me. The significance behind the name is something that will be revealed later.

Devil Dinosaur in this story will be called Diablo. I wanted to play with Avez's Spanish roots, and Diablo is Spanish for Devil. I imagine his being the same as the one in Jurassic Park.

The Hag of the Pits is called the Hag of the Pits in the comics. She will retain that name, but will also be called Gogo by those close to her. Gogo is a South African term for 'grandmother'. Given her age, and the fact that science points at human life starting in Africa, this made sense to me.

For these three, more information will be revealed as the story continues. There is a reason Avez and Diablo are now in the Grail War.

Speaking of Avez, I wondering about a pairing for him. I'm currently leaning towards Scathách (Lancer).

Hope that clears some things up. I've probably gone on too long.

Anyway, please leave reviews, and I will see you all next time.