During a battle with Vilgax, a freak weapon malfunction has duplicated and sent 11-year-old Ben Tennyson to another Earth, altogether. Now, not only does he have to get used to this new world, where he is found by 3 teen spy girls, but also figure out how to use the Omnitrix after it rebooted and back to 10 aliens again! This AU Ben has a different middle name from Ben Prime.

What happens when in a Hail Mary to destroy Vilgax in their final battle, that Ben is sent hurtling across space-time throughout the Omniverse; and finds himself not only in a different one entirely...but 30,000 years in the future...Well, strap in as our intrepid Hero enters into the Great Crusade and battles against the Ruinous Powers. Rated M for Mature Themes and Violence.

This is as the title says a crossover between the two shows, with Eon as the main treat and his villain team. Eon plots to obtain the anti-life equation in order to be able to defeat Alien X, however, Eon will prove to be a formidable enemy to the Light/Apokolips. Eon will end up being an arch nemesis to Vandal Savage. Ben will get to meet the League/Outsider eventually.

When A Chocolate Bunny Meets A Hero With More Than 10 Aliens (I Own Nothing)

Everyone knows Izuku Midoriya when he got his Quirk One For All from All Might to become the greatest hero. In this one, he returns that special Quirk and he is now the wield of the Omnitrix. Rate T later M

Sup, this is Cal. I'm your average Joe except that I died and didn't know till this guy call ROB told me. I can choose a new life to live in any universe. I figured, if I'm going to enjoy this, I better be a pretty powerful dude. But not too powerful, well maybe have a few perks. Look out world, a saiyan is here to be a true badass. (Based on a Ben 10 cyoa, more than 1 crossover)

Ben Tennyson meets Ruby Rose during his summer break, and picks up both the Omnitrix and a thrill for action. Along the way, Ben discovers new alien forms, develops new techniques to use in battle, and a blossoming romance, while also forging close bonds with his new friends. But can he and his friends handle being thrust into a conflict between good and evil? (Cover by elmike)

when the Novatrons, a species, attempt to rule the multiverse and shape it to suit their purposes. In order to save the multiverse from the Novatrons, Ben Tennyson and the other worldly superheroes must stop them. It's time to unite Ultra legion.

Izuku Midoriya is about to give up on his dreams of heroism when a teenager clad in a green jacket and a man claiming to be a professor break into his room in broad daylight. Ben Tennyson and Professor Paradox have travelled to the My Hero universe in order to find a worthy successor to wield the Omnitrix once Ben passes... and they firmly believe Izuku is worthy to inherit it.

we all know that we have one life to spend in this world, and death is the end of that life, but there are some who want to defy death and life push back the shadows, Zack will join S.E.E.S and delve into the Darkest Hour to repel agents the shadows and find their own truth together.

Same story but a new and improved dialogue.

Heroes let villains get away with an awful lot. But what if a villain were to push a hero too far? When Albedo pushes Ben Tennyson past his breaking point all villains will feel the wrath of a fallen hero.

Having returned from a massive adventure in the world of Remnant, Ben, Team RWBY, and the rest of their friends find themselves faced with new challenges at every turn on Earth. Be it villains old and new… or even things that they never imagined to be real. It's going to be a challenge unlike any they've seen before, but they're up for it. It's Hero Time! (Cover Art credit inside)

Gwen Stacy is chosen to become the successor of Ben Tennyson. Read and enjoy her origin as the heroine, G-Morph, and her ever-growing adventure with her arachnoid boyfriend. Mainly based on The Amazing Spider-Man movies and the MCU but has some original ideas. Peter and Gwen pairing. Inspired by The Incredible Muffin. Originally titled "Wristed Heroes"

Ben Tennyson never seem to run out of crazy adventures, but this has to be one of his craziest yet. When he is discovered by Night Raid, a group of assassins fighting for the Revolutionary Army, Ben must decide whether to join them or become a soldier for the corrupt Imperial Capital.

While working under Max Tennyson, Jason comes in contact with an alien device that grants it's user the power to transform into aliens, The Omnitrix. He begins fighting crime and anyone after the power he now has. Slowly becoming the greatest hero in the universe. (Harem) [Dc/Young Justice, Ben 10, Transformers, and maybe more crossover]

Ochako Uraraka finds herself unexpectedly taking on the mantle of the Omnitrix wielder from Ben Tennyson. As Ochako begins to explore the capabilities of the Omnitrix, she must also navigate the complex relationships and alliances, all while facing off against increasingly powerful enemies. Cover by @ZebraKnight1 on Instagram

All his life, Jaune wanted to become a huntsman so he could protect others. However, everything comes crashing down when Ozpin learns about his forged transcripts and expels him from the school. Jaune thought that was it, and he could no longer chase his dream. Yet, that all changes when he stumbles upon the Omnitrix. Maybe there was hope for him still to chase his dream.

When several evil organizations start disappearing and being quiet, Sailor Sun makes the risky choice choosing six heroes on Earth to prevent an evil Digimon's return by searching out the four special Mega Level Digimon known as Guardian Digimon. The Guardian Seekers begin their mission by searching for the first Guardain of the Sea.

The Saddest Cry Baby In The World Gets The Most Powerful Weapon Ever (I Own Nothing)

Here we will see the heroes return with a whole new adventure, and old foes will tried to take over the multiverse

There will always be a hero in any world, but what happens when the most powerful alien device ends in the hands of another ten-year-old boy who was also a wielder fo a powerful Longinus? Let's see.

Ben Tennyson just started his hero career at the age of 10. But he already has a pretty interesting list of villains he faced during his summertime. Many wanted to get their hands on the alien watch, Omnitrix. But today he faced the villain that aimed not just his watch but himself, Eon. During their battle they traveled through dimensions into new world, full of alot of new things

Ben Tennyson was abducted by aliens when he was 10 years old after accidentally received the Omnitrix, but then got rescued by Tetrax. He also brought Rook Blonko with his side. Both Ben and Rook are orphans, where Tetrax trained them to become the Galactic Guardians. Then after reaching his teen years, he received the Ultimatrix and recruiting more members.

Here is a world for both Ben 10 and mass effects Fans, but basically it like any story where ben world is gone and lives in another universe to move on from the pain