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Leonardo Voorhees: Alien Chronicles by Pravus666 reviews
What happens when a 12-year-old Harry is given the Ultimatrix and given the chance to become something greater? Well this is that story, as we follow his misadventures in the world and the worlds beyond, with a legion ready to take on anyone. Rated M for Blood, Violence, Gore and Mature Themes. Ultimatrix Harry AU.
Crossover - Harry Potter & Ben 10 - Rated: M - English - Sci-Fi/Fantasy - Chapters: 2 - Words: 12,886 - Reviews: 11 - Favs: 43 - Follows: 54 - Updated: 7/13 - Published: 6/29 - Harry P., Voldemort, OC, Charmcaster/Hope
Amalgamation: The Huntsmen Arcana by epic insanity666
One world falling to ruin, hope lost with the death of the Phantom thieves, Ren Amamiya is given a chance to right the wrong sof a fake god, but he won't do it alone, for a Huntsmen will be the Sword and shield of the Phantom thieves of Hearts
Crossover - Ben 10 & Persona Series - Rated: M - English - Adventure/Supernatural - Chapters: 2 - Words: 2,769 - Favs: 4 - Follows: 4 - Updated: 1h - Published: 7/17 - [Akira K./Ren A., Ann T./Panther] [OC, Sae N.]
The Tennyson Priestess Logs by SilverSoulmmc reviews
Side Stories of Yukiko and her family during their summer vacation! Filled with humor, friendship, romance, and lots of property damage!
Crossover - Ben 10 & Persona Series - Rated: T - English - Family/Adventure - Chapters: 14 - Words: 25,574 - Reviews: 27 - Favs: 21 - Follows: 28 - Updated: 2h - Published: 12/20/2021 - Ben T., Gwen T., Max T., Yukiko A.
Avenging by Celestial Watcher reviews
Young Ben Tennyson experienced a great loss and tried to escape the life of a hero only to end up being sent to a universe full of heroes. There Ben will have to make a choice, will he return to being a hero or will he give up all together?
Crossover - Ben 10 & Avengers: Earth's Mightiest Heroes - Rated: M - English - Sci-Fi/Adventure - Chapters: 3 - Words: 12,423 - Reviews: 9 - Favs: 27 - Follows: 24 - Updated: 19h - Published: 7/10 - Ben T., Iron Man, Hulk, Thor
The Omnitrix and the Umbral Star by Justin Sewell1 reviews
In one world, two thirds of the Extella Trio are having a ball with who may be their greatest partners, Tamamo with an unlucky spiky teen with a mysterious right hand, Nero with a boy with more guts then one hundred spec ops soldiers, but what about the final member? Well she gets flung into a different world and entwines her fate with that of a young watch wearing hero of course!
Crossover - Ben 10 & Fate/stay night - Rated: T - English - Sci-Fi/Adventure - Chapters: 2 - Words: 6,637 - Reviews: 8 - Favs: 27 - Follows: 34 - Updated: 20h - Published: 7/15 - Ben T., Attila the Hun
Omniverse Ponies After people by jboy44 reviews
One twist of Fate, change the world. Most of humanity is gone, Most of those that remain changed. My name is Ben Tennyson. I am not longer human, and I don't feel like a hero anymore. Yet I think I need to be one more then ever, In the world of ponies after people.
Crossover - My Little Pony & Ben 10 - Rated: M - English - Supernatural/Adventure - Chapters: 13 - Words: 14,023 - Reviews: 27 - Favs: 5 - Follows: 7 - Updated: 7/18 - Published: 6/24 - [Ben T., OC] Button Mash
Lost in a World of Heroes by DMDSKLL reviews
After a grave defeat, Ben loses hope in being a hero but after some unexpected circumstances, the wielder of the Omnitrix is transported to a world filled to the brim with heroes. Having to adjust to not only a new country but also going to school to be a hero Ben has plenty of challenges ahead.
Crossover - Ben 10 & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Sci-Fi - Chapters: 8 - Words: 12,210 - Reviews: 18 - Favs: 62 - Follows: 76 - Updated: 7/18 - Published: 6/7 - Ben T., Shouta A./Eraserhead, Mina A., 1-A Students
Lincoln el Usuario del Omnitrix by Overlord159 reviews
no soy de resúmenes, solo se que hay varias historias de este tipo, pero quería hacer mi propia versión, espero que les guste
Crossover - Ben 10 & Loud House - Rated: T - Spanish - Adventure/Sci-Fi - Chapters: 17 - Words: 204,051 - Reviews: 212 - Favs: 57 - Follows: 53 - Updated: 7/17 - Published: 6/28/2021 - Gwen T., Lincoln L.
Earth's Mightiest Heroes by UltraPhantom reviews
When the powerful King Detritus and his massive army invade Earth, a group of unaligned heroes and a certain Anti-Hero, discover the only way to fend off the attack will be to work together as a cohesive unit. The Blur, Ben 10, Cat Noir, American Dragon, Gwen, Danny Phantom, Ninja, and Kevin combine their respective talents in an all-out battle to save the planet. YJHU: 1
Crossover - Danny Phantom & Ben 10 - Rated: T - English - Supernatural/Sci-Fi - Chapters: 8 - Words: 20,800 - Reviews: 29 - Favs: 49 - Follows: 52 - Updated: 7/17 - Published: 3/18/2020 - Danny F., Ben T., Gwen T., Kevin
The Infinity Legion:Fairy Tail by Jerry Ruffin reviews
After the Darkentors and save the entire Multiverse, the Infinity Legion travels across the Multiverse as its protectors. They travel to the Fairy Tail where they meet the Fairy Tail Mages. They face many challenges together.
Crossover - Ben 10 & Fairy Tail - Rated: T - English - Sci-Fi/Fantasy - Chapters: 2 - Words: 17,580 - Reviews: 7 - Favs: 6 - Follows: 6 - Updated: 7/17 - Published: 7/2
Amalgamation: Good night Night City by epic insanity666
Tests of new technology malfunctioning, Kenneth Tennyson gets plunged into a new adventure into the Urban or city wide combat zone of Night City, scary cyborgs, cyberPsycho's, dead rocker boys, Rogue AI. Who said violence wasn't fun?
Crossover - Ben 10 & Cyberpunk 2077 - Rated: M - English - Adventure/Sci-Fi - Chapters: 1 - Words: 824 - Favs: 2 - Follows: 2 - Published: 7/17 - [OC, Panam P.] V
Corrupt World by Celestial Watcher reviews
Young Ben Tennyson finds himself falling into a universe that is overrun with corruption and evil. The laws of this land are kill or be killed, Ben's morales will be put to the test as this corrupt world throws everything it has at him.
Crossover - Ben 10 & Akame ga Kiru/アカメが斬る - Rated: M - English - Sci-Fi/Fantasy - Chapters: 1 - Words: 4,072 - Reviews: 3 - Favs: 6 - Follows: 4 - Published: 7/17 - Ben T., Akame, Tatsumi, OC
Tales from Avenging 10 by CaptainRex75 reviews
So many Heroes in one Universe. Too many to fit on one story. A series of One Shots involving Ben 10 as he teams up with different Character of the Marvel Universe to fight the forces or evil. (Co-Written by bcarandang1)
Crossover - Ben 10 & Avengers: Earth's Mightiest Heroes - Rated: T - English - Humor/Adventure - Chapters: 5 - Words: 34,815 - Reviews: 75 - Favs: 125 - Follows: 95 - Updated: 7/16 - Published: 7/15/2016
Amphibia 13! by Vgn Golley reviews
Anne and Dereck were just normal kids enjoying their average lives, until one day, they were forced by their friends to steal a musical box, and a pair of strange watches fell down from the sky as they were then transported into another world. Now watch as the kids live among the Frogs, go on adventures, and learn secrets from their Omnitrixes! Full summary in the first chapter.
Crossover - Ben 10 & Amphibia - Rated: M - English - Adventure/Sci-Fi - Chapters: 9 - Words: 154,600 - Reviews: 74 - Favs: 70 - Follows: 61 - Updated: 7/16 - Published: 6/1/2021 - [Anne, OC] Sprig, Hop Pop
Runaway Hero by Victor2120 reviews
Lincoln had run away from home for about four months and had been on his own since. Until one night, he meets the Tennysons and a watch that turns him into ten different aliens. Now he has become something that never thought possible he'd become a superhero. (Got the idea from Overlord159)
Crossover - Ben 10 & Loud House - Rated: K+ - English - Adventure/Hurt/Comfort - Chapters: 12 - Words: 24,422 - Reviews: 58 - Favs: 67 - Follows: 81 - Updated: 7/16 - Published: 11/23/2021 - Gwen T., Max T., Vilgax, Lincoln L.
Ben 10: Rise of a Hero by Ciel Binns reviews
Ben Tennyson is in a world filled with superheros and it's up to him to save the day. Watch as he encounters psychic sisters, kung fu masters, cyborgs, and villains you wouldn't believe. Will Ben be able to rise to the occasion or will evil triumph.
Crossover - Ben 10 & One Punch Man/ワンパンマン - Rated: K - English - Romance/Supernatural - Chapters: 10 - Words: 83,581 - Reviews: 144 - Favs: 97 - Follows: 103 - Updated: 7/16 - Published: 1/28
Ghoul-Vampire: Omniversal by Dragon Emperor0 reviews
Ghoul Vampire Sequel. Months following his conquest of Yokai Academy, Tsukune and his girls find themselves thrust into an unexpected alien conspiracy. New allies and enemies are emerging, and everything is changing. Can Tsukune adapt? *Tsukune x Harem and Ben x Fem! Albedo Harem*
Crossover - Ben 10 & Rosario + Vampire - Rated: M - English - Supernatural/Sci-Fi - Chapters: 2 - Words: 6,726 - Reviews: 2 - Favs: 24 - Follows: 25 - Updated: 7/15 - Published: 11/9/2021 - [Ben T., Frightwig, Albedo, Princess Attea]
James Harem 2 by GreyKing46 reviews
It has been two years since Brother Blood. Two years since the Titan's went their own ways. To learn, to train, to grow stronger. Now they return, stronger than ever, as their greatest challenges look just over the horizon. No longer Teens, they are the Titan's. And they will fight together, until the the end. James(OC)XHarem. NightwingXDuela. ChangelingXHarem. CyberianXSarah
Crossover - Teen Titans & Ben 10 - Rated: M - English - Adventure/Romance - Chapters: 99 - Words: 523,502 - Reviews: 1029 - Favs: 508 - Follows: 478 - Updated: 7/15 - Published: 4/21/2018 - [OC, Starfire, Raven, Jinx]
Izuku's Omnitrix by chloedi reviews
When Ben dies, the omnitrix finds itself a new host in the form of 14-year-old Izuku Midoriya. Will Izuku rise to the challenge, or will it all fall apart?
Crossover - Ben 10 & My Hero Academia/僕のヒーローアカデミア - Rated: T - English - Adventure/Sci-Fi - Chapters: 8 - Words: 8,128 - Reviews: 10 - Favs: 30 - Follows: 35 - Updated: 7/15 - Published: 6/27 - Izuku M., Ochako U., Kyoka Jiro, Eijiro Kirishima
DRAGON BALL OMNI JUSTICE SUPER Z by samuraimatrix1 reviews
Benjamin Tennyson just saved the world from The High Breed and he thought it would be best to celebrate their victory in Las Vegas. Unexpectedly Ben and Julie got involved in a three way marriage after meeting a certain Farm girl from Smallville.
Crossover - Justice League Unlimited & Ben 10 - Rated: M - English - Sci-Fi/Fantasy - Chapters: 15 - Words: 66,377 - Reviews: 37 - Favs: 22 - Follows: 21 - Updated: 7/15 - Published: 6/28 - Supergirl/Kara Kent/Kara In-Ze, Ben T., Julie Y.
Ben 10 JL by Ben 1000000 reviews
An alternate ben gets thrown into the DC then he will heed to live there and survive invasions and attacks of gods and man that could take down gods and deal with his life as well now the questions is that will he take up the omnitrix again to be a hero, can he be an hero again and save people when he himself is a bit broken. (This ben is not ben prime but alternate ben).EXPERIMENT
Crossover - Justice League & Ben 10 - Rated: M - English - Chapters: 2 - Words: 6,445 - Reviews: 2 - Favs: 9 - Follows: 8 - Updated: 7/15 - Published: 6/25
Ben's teenage romantic comedy by Ben 1000000 reviews
Ben 10 goes to sobu high to complete his education. Mostly from the oregairu cast's point of view and 3rd POV not that much action they will mostly investigate what ben is hiding. Pairing ben x Saki or ben x Haruno, it'll be majority of how the characters interact with each other amd trying to live there youth it'll be about Ben living normal life while being a hero.
Crossover - Ben 10 & My Teen Romantic Comedy SNAFU/やはり俺の青春ラブコメはまちがっている - Rated: T - English - Chapters: 4 - Words: 9,903 - Reviews: 5 - Favs: 12 - Follows: 14 - Updated: 7/15 - Published: 6/18
Ben 10 RWBY Volume 2: Ultimate Omniverse by The Omni-Remnant reviews
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)
Crossover - Ben 10 & RWBY - Rated: T - English - Adventure/Romance - Chapters: 43 - Words: 588,181 - Reviews: 768 - Favs: 430 - Follows: 401 - Updated: 7/15 - Published: 4/4/2021 - [Ben T., Yang X.L.] Gwen T., Ruby R.
Priestess 10 by SilverSoulmmc reviews
It's been a couple of months since Yu Narukami and The Investigation Team solved the case and returned peace to their town of Inaba. Yukiko Amagi was looking forward to spending the upcoming summer with her friends however it seemed that her parents had other plans for her, plans that involved sending her to America for a Summer Road Trip with relatives she's only recently heard of
Crossover - Ben 10 & Persona Series - Rated: T - English - Family/Adventure - Chapters: 38 - Words: 187,098 - Reviews: 158 - Favs: 131 - Follows: 141 - Updated: 7/14 - Published: 8/17/2021 - Ben T., Gwen T., Max T., Yukiko A.
The Unidentified Lifeform by Chris Chronos reviews
A Comedy/action crossover story featuring Ben Tennyson as an underground hero in Saitama's world. Comedic events happen around our protagonist as he struggles to mind his own business and achieve peace and quiet. Following his own ideals, will he be able to pull it off as a hero, too?
Crossover - Ben 10 & One Punch Man/ワンパンマン - Rated: T - English - Humor/Sci-Fi - Chapters: 10 - Words: 95,509 - Reviews: 45 - Favs: 31 - Follows: 35 - Updated: 7/14 - Published: 6/18 - Ben T., Genos, OC
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