Ben 10 belongs to Man of Action Studios and Cartoon Network

Monster Hunter belongs to Capcom

RWBY belongs to Rooster Teeth and Monty Oum

I only own my OC and Ultimate forms

Dedicated to Braedey95 and CorJayNelson

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Opening - Ben 10 Ultimate Alien Theme

https://youtu.be/cxUbzV__dUI

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Emerald Forest

"You'll pay for that!" Ultimate Teostra roars as he fires two powerful flamethrowers from his two faces. Ultimate Swampfire held both his arms out and fires a powerful blue fiery beam as parries with Ultimate Teostra's. When once they're done, the Elder Dragon and Ultimate Alien towards each other.

Ultimate Swampfire grabs some gels in his arms and throws them towards Ultimate Teostra, which explodes upon contact as he roars in pain.

"You can't win, just give up." He said as smoke covers the Elder Dragon.

Just then, several ashes of blue aura comes out of the smoke and surrounds Ultimate Swampfire, much to his surprise. When the smoke clear it is revealed Ultmate Teostra who releases it before snapping his teeth. An after, blue auras explodes right in his face, launching him while screaming.

Ultimate Swampfire then turns into Ultimate Arctiguana and uses his cannon to fires ice beams that allows him to land on the ground. But before he could recover, Ultimate Teostra tackles him and turns into Ultimate Rajang as he roars and pummels him with his fists.

"Insolent fool!" Ultimate Arctiguana sneers as he aims his cannons at Ultimate Rajang's face and fires. "AAAAUUUUGGGHHH!" Ultimate Rajang bellows in pain as he he tries to rub the ice away from his body. Having his ice weakness grow upon evolving doubles the pain as well.

Ultimate Arcticguana then turns into Ultimate Rath and grabs Ultimate Rajang's face. "LET ME TELL YOU SOMETHING JACK ANDROS! YOU'RE FIGHTING A LOSING BATTLE!" He said as he throws Ultimate Rajang over his shoulder before turning Ultimate Gravattack.

"So just be a good boy like mommy says and die!" He cackles maniacally as he traps Ultimate Rajang in his orbit and slams him repeatedly hard and fast. However, his comment made Ultimate Rajang more angrier and he turns into Ultimate Teostra again.

"How DARE YOU!" He fires powerful flamethrower from his goat head. Ultimate Gravattack raised his free arm and the attack orbits around him. Suddenly, Ultimate Gravattack began screaming in pain as he drops Ultimate Teostra as he fell to the ground panting and sweating. "What just happened?" He gasps.

"You can change the direction of my attack, but you can't change the intensity of the flames!" Ultimate Teostra declares before he turns into Ultimate Rathalos and swipes his fired claws at Ultimate Gravattack several times. He pushes Ultimate Rathalos with his power before going Ultimate Humungousaur.

"Now this is where you will die!" He hisses as he charges towards Ultimate Rathalos and uppercuts him in the chin before grabbing his tail an slams him down to the ground multiple times. He then rears his free hands which morphs into a missile launcher hand before firing up close to Ultimate Rathalos' face

"Auuggh!" Ultimate Rathalos screams as he manages to free his tail and flew at a distance before turning into Ultimate Zinogre. Ultimate Humungousaur and Ultimate Zinogre then locked claws with one another. It remains a stalemate before Ultimate Zinogre charges electricity, the former's biggest weakness. Ultimate Humungousaur screams in agony, tearing himself away from him as he recovers.

As Ultimate Zinogre and charges at him, Ultimate Humungousaur quickly turns into Ultimate Echo Echo as he releases sonic disks towards Ultimate Zinogre and fires powerful sound blasts.

"Damn you!" He howls in pain as he turns back to Zinogre before going back as Jack. Jack pants as he is on his hands and knees. Ultimate Echo Echo turns into Ultimate Spidermonkey as he laughs and walks up to him.

"Yo should've given up when you had the chance." Jack looks up to see the Evolved Arachnichimp raised all six arms to deliver the final blow.

However, the ice encasing Emma earlier cracker before breaking, freeing her as it caught their attention. Emma heard eerything and she glares at Albedo.

"I won't let you kill him!" She yells angrily before turning into Root Shark and underwent Ultimate Evolution. Her body morph into a blue great white shark as big as Mucilator and a gray forehead and underbelly with three sharp fins with the tips being gray in color. Her fins and tail are also spiked with the Nemetrix symbol around her neck by a collar.

"ULTIMATE ROOT SHARK!" She snarls as she dives under the ground. Seconds, she emerges and smacks Ultimate Spidermonkey away. He screams as he's sent flying up in the air.

"Jack do it now!" She said. Jack wastes no time as he turning into Ultimate Rathalos and fires a powerful fireball from his mouth and hits it target. "AAUUUGGGHHH!!!" Ultimate Spidermonkey screams as he is sent falling down and landing with a few scorch marks on his body.

He groans in pain as he looks up, only see Buglizard and Seregios standing before them. "Stand down Albedo, it's over. You lost." Seregios said.

Despite this, he chuckles as he turns into Ultimate Albedo. "You may think so, but Albedo always returns!" He flashes a bright red light that forces Jack and Emma to covertheir eyes, when the light subsides, the Galvan is no longer there.

Seregios sighs as he and Buglizard turn to Jack and Emma. "He'll return as always." Jack said before looking at Emma. 'You still got the piece?" Emma nods as she grabs the relic from her pocket.

Jack as he and Emma starts to walk back to Bacon Academy.

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Every student in the Amphitheater sat there in shocked silence, their eyes wide and their jaws drop at the battle that had taken place. What began as a imple iniation escalates into an all-out brawl. Soon after, they began whispering amongst themselves.

"Damn that was awesome!"

"How many forms they can take?

"The boy's handsome I'll tell you that."

"I wonder if she's/he's single?"

Soon after, they all decided to head to the cafeteria.

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After they at elunch, all the students return to see Ozpin, and Glynda with the two people who had done the initiation earlier.

"Hello everyone. Mr. Andros and Ms. Emma here happens to have something to say to you all." Ozpin said.

"I'm sure all of you know they re about to share." Glynda said, with Jack and Emma stepping forward to face the crowd.

"If anyone has a question they want answered, we can start from there," Ben said into the microphone.

"Just who exactly are you?" A familiar voice called out. Jack realized that Weiss is the one who demanded to know the most, seeing as she wants to learn their secrets without any information about them or any warning.

"I believe that's where I come in," a voice echoed throughout the Amphitheater. Everyone looked around, trying to figure out who the mysterious voice belonged to and where it came from. The only person not searching frantically is Jack, who recognized the voice immediately.

Turning around, Jack notices a blue portal appear on stage. Stepping out of the portal was the time walker himself, Professor Paradox.

"I was wondering when you would show up." Jack said, "The only times I can think of that you didn't was when I traveled to the dimensions of alternate versions of Ben."

"And based on those experiences, what do you think is the reason I took so long, at least from your perspective?" Paradox questioned.

"If I had to guess, I'd say that my help is needed in this dimension." Jack answered confidently.

"Bravo." Paradox congratulated, "You really should devote some more of that critical thinking to your school work. You wouldn't be a C student if you did."

"Hey, I put effort in school. It's just that hero time gets in the way of study time." Jack defended himself, earning a giggle from Emma.

"Uh." Pyrrha said, "I'm sorry, but could you please explain who this person is?"

"Allow me, Miss Nikos." Paradox said with a bow. "You may call me Professor Paradox. I wander all of existence to guide all worlds along their most beneficial path. As for how I know your name, it is not because you were famous but because we will have met it the future. Sorry, time travel makes verb tenses so confusing."

"Paradox has a tendency to live events out of order." Jack explains. "The only benchmark I have for the order he lives these events is his outfit change, which includes his mechanical arm."

"Now on to the more important matter," Paradox said as he tapped his walking stick on the ground, creating a holographic tree in the stage, "If you think of time as a tree with branches, then a multiverse consists of the multiple branching events that can and have occurred within a universe."

"But Jack and Emma's universe is so different from ours." Jaune spoke up. "Our dimensions couldn't possibly have a shared history."

"Correct Mr. Arc." Paradox compliments Jaune. "That is because Jack and Emma are from a different multiverse."

"So why are they here then?" Ruby asks.

"I have seen the possible futures of this world." Paradox said, rubbing his chin." Unfortunately,  with the exception of one, all 14,000,605 of the future you will all have to face is rather, if you excuse the pun, grim." (1)

"So the reason you sent me here is to help this world and produce other outcomes, correct?" Jack said.

"Correct." Paradox confirms, then looks at Emma. 'And I think it's time they know about your origin too." He then taps the Nemetrix symbol her chest with his staff, causing a red light to consume her body as her real form is revealed, much to everyone else's shock and surprise.

"Is that even necessary?" Jack asks, not amused. "You could have just asked." He picks the Nemetrix symbol and twists it clockwise once before Emma returns.

"So no cool." She glares slightly at Paradox before sighing and looks at the crowd. "But yeah. As you can, I'm not really a girl, but a device that allows me to turn into natural predators of certain aliens, or extraterrestrial beings, and turn into Ultimates as well."

"Can you demonstrate?" Pyrrha asks.

Emma nodded as she slaps the Nemetrix symbol on her chest as a red light developed her. In her place is Crabdozer.

"This is Crabdozer. The natural predator of the Pyronites, or people with bodies literally made of fire. They are incredibly resistant to fire, extremely durable and, despite their sizes, are actually fast." Crabdozer stated.

Not soon after she said, that, a loud ding is heard as a pink grenade is launched and hits her in the back, though it didn't fazed her one bit. Crabdozer turns to see Nor with her grenade launcher/hammer out. "Um, what are you doing?" She asks in annoyance

Nora shrugs as she puts her weapon away. "Just wondering if is that durable." She said. Crabdozer sighs before turning back as Emma.

"Welp, meeting's over. You are all dismissed." Jacksaid as he and Emma headed back to there dorms.

"I'll be taking my leave then as well." Paradox said as a portal appears behind him. "I'll see you all again soon enough, or is it I have met you all before soon enough." With that said, he enters the portal as it disappears.

After 10 minutes, most of the students left the Amphitheater. The only students left are Teams RWBY and JNPR, who are still a bit stunned by the events that occurred.

"Well..... that was a thing." Yang said.

"You said that during our initiation." Blake adds.

"I think I've had enough excitement for one day." Jaune said, exhausted.

"You didn't collapse on the ground after fighting a Grimm." Ren counters, remembering their first fight together against the Death Stalker.

"Let's just go back to our dorms and get some rest." Ruby said as she made her way out of the Amphitheater, the rest of the two teams following her lead.

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Alien Data

Ultimate Root Shark

Species: Root Sharks. The predatory species of Arachinchimps

Abilities: Shark-like body, spikes on its body, can dig and swim on land

Weaknesses: Ironically doesn't swim in water unlike real sharks, high pitch sounds can force her back up on the surface