AN: After reading several Ben 10 x My Hero crossovers I noticed that there isn't a story of what if Ben was transported to the world of My Hero. After realizing that I decided I should write my own story. For context of the timeline, this is a post Omniverse Ben wearing the same clothes he did in UAF, and on the My Hero end, Ben appears at the same time the sludge incident happens. Enough with my ramblings time to get on with the story.

-Chapter 1: Not in Bellwood Anymore-

Ben Tennyson is a boy of many things, a hero, the savior of the universe, and defender of Earth but tonight, he is nothing more than a child lost in a forest. The young brunette with emerald eyes stands next to the DX Mark 10, a custom black sports car with a green accent over the sides of the car. On the hubcaps are a green and black hourglass symbol. The teen is holding the trunk open looking at both souvenirs and pictures from his past adventures laying a green leather jacket with a white stripe going down the left side on top. Taking a step back Ben activates a white watch on his left arm.

"I guess it only makes sense to end it where it started," Ben says to himself while looking at a crater that has been filled in with plantlife for the last 6 years.

Closing his eyes he slams down on the watch after selecting a flaming head icon but instead of the green flash of light he was used to, it was blue when he opened them he was no longer in a forest but a lavish office.

"Excuse me, young man, how did you get in here?" came a small voice

Ben turned around to see a bear, dog, mouse, thing in a suit and a scar on its left eye sitting at a desk. If this creature was an alien Ben has never seen this species before.

With a hint of frustration in his voice, the teen responds "Before I answer that, where is here exactly?"

"You would be in my office at UA." the creature states as if Ben should have known this.

"UA? What's that?" Ben quickly asks.

"UA, The top Hero School in Japan rivaling several schools worldwide." The mouse thing states with an air of concern. "Young man, before this conversation continues may I ask who you are? I'm Principal Nezu by the way."

Already getting an idea of what is going on the teen states "I'm Ben Tennyson. You know, Ben 10? Savior of the universe?"

The only response that the white creature gave was, "Sorry, I don't know what you are talking about."

"Not again! Not now!" Ben proclaims putting his face into his hands.

"Young man, are you ok?"

"Physically, yes. Mentally, questionable. Situationally, royally screwed."

"Care to explain?"

"Well to answer that, I need to ask. Are you familiar with quantum mechanics?"

"In fact I am. My quirk gives me intelligence that makes me one of the smartest beings on the planet." the creature states matter of factly.

"That makes things much easier for me," Ben says in relief before pulling his thoughts together "I believe I am not from this dimension."

"Why do you believe that? Because that is quite the assumption to make."

"Many reasons actually. For starters, this isn't my first time in another dimension. Secondly, I'm an intergalactic superhero. Lastly, I don't know what a quirk is."

"That is a lot to take in." Nezu mutters to himself "Starting from the top, You have been to a separate dimension before?"

"Four to be exact, along with a couple of pocket dimensions," Ben states offhandedly.

"You also said intergalactic, as you have interacted with alien life?"

"Yeah, quite a lot actually, my partner Rook…" Ben trails off before looking sorrowful and bottling his emotions "You mentioned something about a quirk. What is that exactly?"

"Well, a Quirk is a supernatural ability or trait that someone may possess," Nezu answers with an air of uncertainty about the teen's mental health.

"So everyone in this dimension has a superpower?" Ben questions a little dumbfounded

"Not everyone, sadly; about 20% of the population do not have a supernatural ability and even then, not all powers are great for hero work." Nezu then asks "Would it be ok if I ask some questions about your world, along with having Psyclone probe through your memories? This way I can confirm your assumption about alternate dimensions is true."

"I'm assuming Psyclone has a telepathic ability?" Ben asks unsurely

"Along with telekinesis, yes. Psyclone is a counselor at the school and is amazing with helping students find their way through their years here at UA."

"I will allow him in my head on one condition. Do NOT go through the last month of my memories. Am I clear on that?" Ben states rather than asks.

"Crystal," Nezu says with his beady little eyes.

After what felt like an eternity, of both questioning and mental probing from both Nezu and Psyclone, a purple-clad man with an eye for a helmet, Ben was told to go to Class 1-A to retrieve a man that goes by Eraser Head.

Still, in the room, Nezu asks the taller man "Did you get what we needed from the boy?"

"Indeed sir but, What I saw was something a boy his age should never experience." Psyclone says before importing an image of a being with a tentacle face holding a dripping sword into the mind of the white-furred creature.

AN: Thank you for giving my first chapter a read. If you have any comments or critiques please do so in the reviews.