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Ben 10: My Alien Hero Academia

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Synopsis
You all know the story of Benjamin Kirby Tennyson, but what about if he was suddenly transported to the My Hero Academia universe so there other heroes aside from him. What if he joined a school made to train the next generation of heroes. As they adapt to this new world, Ben and his team enroll in U.A., training alongside future legends in the making. Romance blooms, friendships grow, and villains rise with dangerous curiosity about these “American transfer students” with mysterious powers. But the truth won’t stay hidden forever. Watch as Ben Tennyson redefines what it means to be a hero—beyond quirks, beyond limits, beyond worlds.
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Chapter 1 - Chapter 1

3rd POV

Ben's home universe

Bellwood 

One year has passed since Ben Tennyson, Hero of Earth, defeated not only his arch foe Vilgax, but also took down the extra-dimensional demonic entity known only as Diagon. Since then, things had gotten back to a relatively normal state for the Omnitrix wielder, though you wouldn't have guessed it if you'd seen him at the moment. Ben was currently spread out across his bed, staring at the ceiling with a forlorn expression. Normally, Ben didn't get upset that easily, but considering what was on his mind at the moment, you'd probably understand.

'Its quiet moments like these where I start to miss her sometimes can't believe its been a year already since me and Julie broke up. I guess my life is a little to crazy to date someone normal and doesn't want to be apart of the hero's life.' The 17 year old hero thought to himself. His pulled out of his thought when he hears his phone ringing. Checking the caller ID Gwen. He smiled and answered. "Gwen! What's up cuz?"

"Ben! Glad you picked you picked up. I'm doing great really. How about you?" 

"Eh pretty solid week stopped Animo and his army of crocodiles that all looked like killer croc. He was trying to take over the world starting from Bellwood AGAIN! So how's your test you got back your scores today right?"

"Ugh, yes FINALLY done! I PASSED! So I'll be graduating and be done withhighschool." Ben laughed and congratulated his cousin. "We're actually on our way back right now. I'm calling from Kevin's car."

"Really? That's great! Just one week away from our vacation you excited?" Ben cheered. The two cousins, Kevin and their grandfather were taking a cross country trip to south America in a week and Ben could hardly wait.

"Yeah, It's gunna be great. But what about you. You holding up okay?"

"yup, I'm doing great. Though things at base have been pretty busy lately. The incarcecpn prison around Vexis-6 is ready for our... guest. All I gotta do is see him of world and we should be good for the summer... and hopefully the rest of our lives." Ben seriously did hope.

"That's great but not entirely what I meant. Ben it's been a year and I was concrend that you didn;t call me after it happened. Kevin told me to give you some space and to avoid asking but... Are youokay?"

Ben instantly knew what she was talking about, but it didn't really help. He looked over to a photo on his night stand, one that had been taken at his grandfather's sixty-sixth birthday cookout last year (don't ask how the food was). The picture was of him, Gwen, his best friend and former enemy, Kevin, and his now ex-girlfriend, Julie Yamamoto. There were disadvantages to dropping out of school and this was one of them. Ben had dropped out a long time ago to focus on his hero duties, but Julie had stayed in and graduated this year. However, she decided to go overseas for her degree. In the end both she and Ben agreed that, knowing the ups and downs of their relationship, long distance would not work between them. The two parted ways at the airport a year ago.

"BEN!"

"Gah!" Ben snapped out of his memory. "Y-yeah?"

"I was asking if you were okay." Gwen repeated. "I just... I wanted to know if you think you made the right decision. Breaking up with Julie."

Ben sighed. "Gwen, I know that ending it wasn't the easiest thing to do... but it was the RIGHT thing to do. In the long run, it'll save us both a lot of pain. Besides, you know Julie, she's not made for this kind of stuff. And I think she might of gotten sick of it just a little bit."

Gwen sighed. "Alright, just... don't beat yourself up over it okay? It's not healthy to keep your emotions bottled up like that. You're free to talk with me anytime, you know that right?"

"Heh, yeah, I do. Thanks, I'll see you soon Gwen, bye." Gwen said her goodbye and Ben hung up the phone, sprawling onto his bed again. He gave a sad sigh. "She's right, I've gotta get my mind off of this." At that moment, the lights in his room suddenly all went dark. Ben sat up in annoyance. "Oh, great. Just perfect!" But then, just as quick, the lights flickered back on. "Huh, well that was—"

BOOOM!

Ben's head jerked back at the explosive noise that shook not only his eardrums, but his entire room. The Omnitrix started blinking and beeping, signaling that someone was calling him. Ben tapped the watch face and spoke into it. "Ben here, go ahead."

"Ben, it's Max, we've got a situation." His grandfather answered on the other end.

"Grandpa, what's wrong?"

"The base just experienced a short term electro-magnetic pulse. I'm on my way there now. From what the officers said... I'm afraid a certain inmate's making an escape attempt. We need you here on the double."

"Who's trying to escape?!"

"Look outside." Ben flew to his window, seeing a billow of smoke rising up from the Plumbers secret Bellwood headquarters. It was only when he gazed further up that he knew who was trying to get a "Get-Out-of-Jail-Free" card.

"Crap." Ben said in a hushed tone. Floating about 10 meters above the city was none other than one of Vilgax's mighty warships. He spoke into the Omnitrix once again. "I'm on my way!" Ben touched the watch face of the Omnitrix and a holographic ring came up from it, showing the faces of his aliens. He selected one and the watch face slid back, the Omnitrix core popping up from its resting place. Ben slammed it down and turned into the alien he chose, a humanoid made of molten rock and fire.

"Heatblast!" Ben shouted in a raspy voice. Heatblast jumped out of the bedroom window, willed the earth that was now underneath him up out of the ground and lit it ablaze, making a platform for him to fly on. The Pyronite rose up and shot off toward the Plumber base. "No time to mope Ben," he told himself, "there's work to be done."

...

In hindsight, at least from Max Tennyson's perspective, he knew that keeping the arch nemesis of your family in the secret underground base was a bad plan. However, Plumber High Command, being the absolute GENIUSES that they were, insisted that NOTHING could go wrong by just keeping Vilgax there for a year while they prepared a new maximum security prison that could actually hold him. But Max knew something was wrong from the moment that Vilgax was locked up, that being the warlord's compliancy in just about everything. He hadn't even been any escape attempts in the time that he was there. At least until now, on the day that the new prison for him was finished. Max knew why as well, to lull the Plumbers into a false sense of security, and then strike when they least expected it.

These were the thoughts that were running through his head as he pulled up to what remained of the outer facade of the Plumber base and saw the Chimera Sui Generis standing amongst the rubble. Vilgax was now donned in an armor that was similar to the one that he had worn seven years ago, with the addition of a headpiece on top of his head as a sort of crown. The once bright afternoon sky had turned dark, arcs of lighting shooting through the sky marking the alien warlord's return. Max exited his motorhome, the Rustbucket, and began to approach Vilgax, who didn't waver from his spot. Before he could make himself known to his old foe, he saw a body moving amongst the rubble out of the corner of his eye. It was a Plumber, in full uniform, one with a familiar head of messy blonde hair. Max's eyes widened. "Cooper!" he exclaimed.

Cooper Daniels, Plumber, technopath, a young man who once had a crush on Gwen, but most importantly, a friend. He was laying there, half buried by rubble, struggling to break free. Max made his way over to him while Vilgax turned in his direction, now fully aware of his old enemy's arrival. As Max worked to get Cooper out, the young Plumber started doing the first thing that came to his mind: apologize. "I'm so sorry Mr. Tennyson. We had no idea this would happen and it happened so fast and I—"

Max cut him off before he could start rambling. "It's okay Coop, none of this is your fault. I've always suspected this would happen, but I guess no one in the higher ups likes to listen to us old timers anymore."

"Heh, respect your elders right?"

"Exactly." Max slung Cooper over his shoulder and asked: "Can you feel your legs?"

"Yeah, and they hurt." Max got a brief chuckle out of that before his attention was redirected to the shadow that was now looming over them. Vilgax had stridden over while the two were talking. The two old enemies simply glared at each other, one knowing he and the boy he was carrying were in no shape to fight, and the other feeling like the most powerful being in the universe once more.

"Ah, Tennyson," Vilgax spoke in his raspy yet guttural voice, "I suppose you didn't see this coming did you?"

"To be honest Vilgax," Max retorted, "I almost expected you to make your escape once you were off world and on your way to your new home. But on the other hand, destruction IS your forte."

The warlord scoffed. "I suppose the unfettered snark must run in your family."

Max smirked. "More than you know."

Vilgax however, turned around and waved him off, walking into the middle of the road underneath his ship. "But that is of no matter right now, I must be on my way back to my world. I shall let you live for now Tennyson, but know this, when next we meet, it will be our la—AAARRRGGG!"

A ball of hot fire hit Vilgax square in the jaw, sending him sprawling on the ground, clutching at his face. From out of nowhere, Heatblast flew down and leapt off of his earthen platform and next to his grandfather. "Hot stuff, huh Vilgax?" the hero taunted.

"TENNYSON!" Vilgax cried out from his place on the ground.

"Which one? Me or him?" Ben asked as he pointed a thumb between him and the elder Plumber.

"Ben, this is hardly the time for smack talk." Max pointed out.

"I know Grandpa, but I had to at least get a few good ones in. Besides, you heard him, we Tennyson's are naturally snarky. But from here on, it's strictly business." Ben redirected his attention to the blonde hanging off of his grandfather's shoulder. "Hey Coop."

"Hey Ben," the technopath replied. "Come to kick ass and take names?"

"Yep, though I suggest you sit this one out in the Rustbucket. Things are about to get ugly out here." He turned back to Max. "Get a Null Void projector ready Grandpa, we're gonna need it."

Max nodded. "Good luck, Ben. Do me proud." Ben nodded back and Max went back into the Rustbucket, helping Cooper alongside him. He laid Cooper down onto one of the bunk beds and went to work. Max reached into a secret compartment and pulled out a strange device that looked like a handgun with a big lens attached to it. The Null Void projector, a device to send intergalactic evil-doers to an alternate dimensional jail, was just what they needed in this situation. All Max had to do was calibrate it correctly.

Back outside, Vilgax stood up, his attention focused squarely on his Pyronite opponent. He let out a roar of frustration and pointed a clawed finger at Ben. "Tennyson! I have had enough! You and your compatriots have been a thorn in my side for far too long!" However, Ben wasn't paying any attention to Vilgax. He was too focused on the green and black muscle car that was fast approaching the warlord from behind. The car swerved around and knocked Vilgax down from underneath himself. It screeched to a halt and the driver's side door opened, revealing Kevin Levin, a big smirk on his face.

"I'm sorry," the black haired Osmosian said sarcastically, "but did somebody mention us?" The passenger side door opened and out stumbled Gwen, looking rather dizzy and a little green. She covered her mouth and gagged, trying her best to keep whatever was in her stomach down. She turned to her boyfriend and gave him a sharp glare.

"Kevin Ethan Levin... please... never do that again!" She said in between breaths.

Kevin put a steady hand over Gwen's shoulders, supporting her as they made their way over to Ben. "Sorry," Kevin apologized, "just wanted to get the drop on ol' Vilgy over there."

"Well next time, could you just fire the plasma cannon that I know you have in that car?"

"Oh, okay." Kevin sighed. "Just wanted to have a little fun with it. Do you know how hard it is to make a badass entrance like that?"

"Practicality over badassery sweetie." She saw her cousin and smiled. "Hi Ben."

"Hey Gwen." the Pyronite replied. "Looks like South America's gonna have to wait huh?"

"Eh, what can ya do?" As Gwen regained her composure, Vilgax stood up, clenching his clawed hands in an attempt to restrain his rage.

"Must I always expect interference in ANY attempt to escape this wretched planet?!" he bellowed.

"Yes, yes you will." Heatblast said while lighting his fists ablaze. Kevin reached down to the pavement and absorbed it, turning his hands into a pair of maces in the process. Gwen's eyes lit up in a bright pink color with her own hands lighting up with mana of the same color. Ben gave the word. "It's Hero Time!"

The following battle was seismic in proportion. As the two sides clashed, the impacts became more intense. You could almost hear the thunderous sounds of colliding punches from miles away. The trio of heroes desperately tried to keep Vilgax down, but nothing seemed to faze the warlord, getting up every time they put him down. A good five minutes passed before Max finally came back out, Null Void projector in hand.

"Kids!" Max hollered. "Get clear!" The three teens retreated as fast as they could as Vilgax got up once again. When the warlord found his footing, his vision cleared... only to see Max pointing the projector directly at him. "Make my day, Vilgax!" Max shouted as he pulled the trigger.

However... nothing happened. No portal, no ray of light, nothing. Max was confused, he was sure he calibrated the thing correctly, so what was happening? He tried pulling it again and again, but nothing came of it. The projector suddenly began to spark in malfunction, shocking Max's hand so much that he tossed it to the ground in-between himself, the kids and Vilgax. What happened next, no one could have guessed.

The projector broke apart and a burst of light came out of it, a portal to the Null Void opening up in the ground. The group stood in shock as they saw something trying to claw its way out. As it moved out further they could finally get a clear view of its body. It was a reddish-orange colored creature that appeared to be entirely made out of flames. Its face and chest were clearly defined by a brighter orange color with white slits for eyes. It spoke in a tired raspy voice: "Free... at last."

Gwen, Kevin, Max and Vilgax looked on, the warlord speaking first. "What IS this creature?"

"That's what I'd like to know." Gwen responded almost out of obligation, not really talking to Vilgax himself. "Kevin, Grandpa, any clue?"

"Nope."

"Not a one."

A green flash caught the corner of Gwen's eye. Ben had changed back to normal... and wore a horrified expression. "Ben... do you...?"

"Yeah," he answered, "That... that thing shouldn't be alive. It's the Alpha Nanite."

"You mean that thing you said you beat up with the help of some dude with machine powers in another dimension?" Kevin asked.

"Yep."

"...The story that we didn't believe you on?" Gwen added.

"The very same."

"Oh... sorry."

"Yeah, sorry dude." Kevin added.

Ben shrugged. "No big deal. I probably wouldn't have believed myself either if I wasn't there." Another lightning strike came thrusting down from the sky, directly onto the portal and Alpha. The Nanite creature screamed in agony, the combined energies being too much for it to handle. As if things couldn't get any stranger, the portal imploded around itself and, out of its center, a dome of light began to expand. "What the hell's going on?!" Ben screamed.

"The portal!" Vilgax yelled in a panicked voice. "It is destabilizing! Flee you fools!" Vilgax was beamed up into his ship which blasted off into space while the four humans were left in front of the expanding dome.

"RUN!" Max hollered and the teens followed suit. However, the dome of light was growing faster and faster. It encapsulated the Rustbucket, Kevin's car and the four humans... before finally bursting into nothingness. There was nothing left on that city block in downtown Bellwood but a crater with no sign of the universe's greatest heroes in sight

 ...

Mustafu, Japan

Unforeseen Simulation Joint

On another earth in a different universe, Shota Aizawa was not having the best day today. Why? His students were split up and in danger fighting villains, his colleague is injured possibly dead and the worst part he's fighting for his life while listening to the leader of this attack whining like a damn man child who destroyed his elbow.

Using his one good arm and legs, Eraser Head is fighting any grunts in his way to get to Thirteen. He dodged the gorilla arm grunt and drop kicks the villain holding bolas. Eraser Head starting to get tired as he is panting surrounded by enemies.

"That annoying quirk of yours isn't suited for drawn out fights against big groups, is it? Don't you think your a little out of your element here Eraser Head? Your known to be a stealthy hero and doing surprise attacks." Shigaraki taunts him.

"But despite knowing that you didn't hesitate to jump in the middle of the fight to put your students at ease." 

Eraser Head glares at him for a moment before wrapping up villain d in his capture weapon and using him as ram knocking the other villains away. Villain a almost hits him with his mace hand but Eraser Head punches his jaw knocking him out. He erases villain c quirk that allows him to spit fire balls and kicks him down. Using the gorilla arms villain as a spring board Eraser Head jumps out of the circle of villains surrounding him. 

"Look at you your still standing your so cool! oh and by the way hero I am not the final boss." Shigaraki says.

Eraser Head turns just to see a ten foot monstrosity with an exposed brain and a beak.

"Nomu break him." Shigaraki orders.

A few minutes before, near the entrance where some students are watching Thirteen battling Kurogiri. She is using her quirk Black Hole to suck up Kurogiri dark purple mist so her other students won't get warped away.

"Ah Black Hole, the quirk that sucks up matter and turns it into dust such an astounding power. However your a rescue hero Thirteen. Skilled at saving people from disasters." Kurgiri activates his quirk opening a small warp gate Infront of of him. "Consequently that means you have little fighting experience or battlefield awareness" Another warp gate appears behind Thirteen.

Before the warp gate fully forms, a glimmer of light appears between them both and an exploding blinding light stops their quirks and pushes them back from each other. As they land on their feet Kurogiri and the students are shielding their eyes from the harsh light, Thirteen is fine as her helmet acts as a cover. Once the light dies down they all see a figure in the middle. It was a young man, about a year or two older than the students, caucasian, brown hairm green eyes, wearing jeans, sneakers and a black t shirt under a green and white jacket with the number twn emblazoned on the left pectoral. He also wore a weird watch on his left wrist, white eith a a green and black hourglass on its face. He rubbed the side of his head in pain. 

The first words out of his mouth being. "Why do explosions always happen around us? Thats gotta be the fifth time this month!" 

Ben looked around and sees a weird figure made out of purple mist, another weird person in an astronaut suit and a bunch of injured teens. Seeing the way the teens are behind the astronaut, with said astronaut Infront of them protectively he understands what's going on.

"I may not know where I am but I do know that your are hurting innocent people weird mist guy." Ben glares at Kurogiri.

"I'll be happy to explain where you are after I kill that hero her students so kindly get out of the way or join them in death." Kurogiri threatens Ben.

Ben blinks at the threat he hears in Japanese's. 'Thank god I learned Japanese with Gwen and Kevin when we were going to Japan for a vacation in Japan with Julie.' 

"I'd be happy to get out of your way if it weren't for two things. One, these teens look scared and hurt. Two you just said you wanted to kill them and this hero. That sounds PRETTY EVIL. I'm surprised that you haven't attacked me yet." Ben tensed up getting ready.

"Your right I should just attack you now!" Kurogiri sticks out his hand and a warp gate appears Infront of him. 

"WAIT KID! Run over here this guy's dangerous and will kill you!" Thirteen tries to warn Ben.

Ben turns and smirks at her. "Don't worry I'm tougher than I look." Ben brings up the Omnitrix a small green holographic disk appeard over it. He scrolled through it, the face pulled back and its core sprang up. He slammed it down and... something incredibly happened. Everyone in the vicinity watched as a blinding green light came in an instant. When it died down taking the boys place was a semi-armored Velociraptor. He has black orbs on his feet, a black tail with five blue stripes, and bulky claws on his three fingers that can only open and close. He wears a black cone-like helmet with a protective visor that slides over his face. When the visor is lifted, one can see his blue face, green eyes, black lips, and stripes running under and in between his eyes; the rest of his head's features are unknown. XLR8 wears a black bodysuit and turtleneck-like shirt with a white stripe on the center. The Omnitrix on his chest. "XLR8"

Everyone was taken back at what the teen transformed into with some of the students whispering cool. With speed faster than anyone could track only seeing a black and blue streak XLR8 runs circles around Kurogiri. Running so fast he causes a small tornado sucking up Kurogiri warp gate. XLR8 stop infront of him and spins generating speed to tail whip Kurogiri on his metal brace flinging him across the room into a wall indenting it and knocking him out. XLR8 appears infront of Thirteen and the others.