(AN: So this is my first story at least posted I do have another story that has three chapters to it but I don't think I'll post it any time soon. As for this I noticed that there weren't a lot of Ben 10/YJ stories so I thought I would try my hand at it. I also took my own spin on the Ben 10 universe. Such as no Kai/Ben romance, Also a little darker Ben but doesn't show often. Now last thing Ben and all his Aliens have there have their Omniverse design except Big Chill I like his original design. I do not own Ben 10 or Young Justice.)

Summary: After his Universe wide road trip Ben's Parents and Grandpa were killed because of this Ben stopped his Hero work and decided to work on a new device to help people while he grieved, but now the one that killed his family has escaped to another universe and it is up to Ben to help take him down, But there are some changes that Ben doesn't particularly like.

Chapter 1: (Coincidences Don't Happen)

Ben Tennyson was in his workshop working on something he had seen multiple times yet still didn't exist. He had been working on this since the end of his Galaxy wide road trip with Rook. Now after 6 years a 22 year old Ben Tennyson was putting on the finishing touches to his new Biomnitrix, of course this isn't exactly like the one his future. Using the combined forces of Grey Matter, Brainstorm, Jury Rigg, and Upgrade he made it better than his future self's.

The two gauntlets look exactly like his future self's version a Dark Green gauntlet with a Black faceplate with a Lime Green hourglass symbol on each Matrix.

The features he added besides the ability to fuse aliens together are two very advanced AI's in each Gauntlet so advanced that they are technically Human they analyse the threat and give Ben advice on what alien or fusion to go with. He also added a hard light hologram feature so he could use it to get a lay out of the land and for distractions. Another feature is the Evolutionary Function but that only works if he is just a normal alien the reason for this is because he might need the extra power in case of a threat that he couldn't handle with just his fusions. A cloaking device to hide his Biomnitrix from public view. And the last feature is a function to form a White Suit of Armor with Dark Green Lining making it have a circuity look kind of like upgrade, on the Chest of the Suit is a big Black circle with a Lime Green hourglass in the center, And a Helmet just like Spanners. This last function was mainly because he thought it was cool and he needed more protection in his Human form.

Ben had just put on the final touches and was getting up to test the new device out. Getting out of his lab and into his training room took about a minute This was his house in Bellwood payed for with his Plumber paycheck it was a moderately sized house but since he lived alone he had room to have a lab and training room. Entering the training room he said "alright after this I won't need the Omnitrix anymore" his voice pierced the quiet night air.

"Omnitrix Command Function Override Code 10" He said with absolute authority.

[Override accepted Voice Command activated] the omnitrix said with a robotic voice. "Decouple Omnitrix Command Code: 000 - Release Coupling - 0" The authority in his voice giving anyone listening chills.

[Command Accepted, Omnitrix Decoupled] the robotic voice said as the straps of the Omnitrix retracted into itself looking like a square cracker as it was placed on a nearby table.

Standing in the center of the room Ben slid the Biomnitrix onto his arms the Matrixs adjusting to fit perfectly on his arms. "Are we good to go?" he asked to no one when suddenly the two devices on his arms lit up glowing a soft green. "Yep there seems to be nothing wrong with either of us but I would still recommend a test of each function" a very energetic female voice spoke out of the device on his left arm. "I agree, but remember to be careful" spoke a different female with a silvery voice from his right arm.

"Thank you Amy and thank you Zoe for your consideration." Ben said with a gentle smile speaking to each of his arms respectively.

"Alright Big Chill." As soon as he said that an emerald green light engulfed him and when the light faded a slim humanoid, blue moth like alien with a green and white belt that had the Biomnitrix symbol on it to look like a belt buckle. After a second of making sure he was fine he decided that he would test the next function.

"Ok Amy check the normal transformation off the list because now we are testing out the ultimate function." The happiness in his voice couldn't be contained as he hit the Matrix symbol causing four spikes to pop out and a green wave of energy to flow over Big Chill. "Ultimate Big Chill." Ben shouted as he looked over his new form looked similar to his old form but instead of Blue he was Red and his wings and antenna have a Flame design. Taking a few more seconds to look over his form he eventually was engulfed in a green light returning to human.

"Great Job Ben the normal transformation function was a success and so was the ultimate function one more test and I can officially say that me and Zoe are completely operational." Amy said this with a hopeful voice.

"Yes and then we can finally see what hero work is like." Zoe spoke with interest in what the rest of the world would be like when they had complete bodies.

Ben smiled sadly at that because even though he is a hero he couldn't save everyone and of those people his parents and grandpa were the ones he failed to save. This had happened almost immediately after his universe wide road trip the person that did this was Albedo though he is now confined to the most secure prison in the universe for not only his past transgressions but for killing one of the greatest Plumbers the universe had ever known. No one knows how he got off of Galvan Prime or how he fixed his Ultimatrix since he won't talk. After that Ben stopped being a Hero and decided to work on something to help him be a better hero when he was ready to come back. He spent a lot of time grieving but kept pushing forward, but now after 6 years of grieving he has finally gotten over their deaths is ready to get back to being a hero.

"Alright time for the last test and then it's Hero Time." He said this while wiping away a single tear. Steadying himself he slammed his two gauntlets against each other while yelling "Humungoopsaur!" With an emerald flash Ben was replaced with a being that looked like Humungousaur in shape, But his body was a green slime like substance that was Goop. Above his head was a tiny white UFO that was Goop's Anti-Gravity Generator and draped across his chest was a white sash with Biomnitrix symbol on it.

"Oh Yeah that is what I'm talking about the new and improved Ben 10 is here and ready for anything." Humungoopsaur said with excitement. Before an emerald flash reverted him back to human. "Alright and with that we are finished I have completed the ultimate hero tool now I can help as many people as possible." Just than a portal opened and out stepped a person he seemed to be be at least in his 40's or 50's he was dressed in a steampunk look and had a prosthetic right hand.

With the portal closing behind him the man spoke "Hello Benjamin there is a problem and you have the choice of fixing it but you probably will never see your friends or this universe again." The man spoke in a gravely serious voice.

"What is it Professor Paradox?" He asked with worry because this felt oddly to coincidental that he just finished the Biomnitrix and that Paradox comes with a problem.

*Elsewhere 1 Hour Ago*

Albedo was sitting in his cell smiling to himself the reason for this was because after six years of looking like a 13 year old Ben Tennyson with white hair and red eyes he was finally gonna escape of course the six years of imprisonment though hated was necessary for his partner to heal from being thrown into a warp generator and then launched into space. But today was the day he would break out of this prison and journey to a new universe that didn't have an Azmuth and he would rule that universe after he killed his partner.

After a few minutes of him counting down He heard an explosion and then an alarm, but it was shortly cut off and soon it was silent Albedo smiled and soon the door to his cell was ripped open as though it was paper. And behind the door was a black and red being that had a yellow star mouth and squid tentacles, this being was known as Malgax. He is the combination of Vilgax and Malware and for the past six years he has been in a healing pod in a safe house on a unmarked planet. Of course he knew the plan because, Albedo had foreseen what would happen because of his Evolved Chronosapien form and knew that for him to rule the universe he would need to trick Malgax into freeing him and then kill him with a failsafe he put in his armor before leaving to his new universe.

"Right on time though I should know I have already foreseen what is to come until we leave this universe." Albedo said with a haughty tone to his rather young voice.

"Whatever now shall we go before the Plumbers get here." Malgax said with impatience as he handed Albedo three items. One was his Ultimatrix that he slid onto the back of his right hand. The next item was the device that would take them to the other universe it looked like a red and black version of Azmuths teleportation device. And the final item was a grey box with a single red button on it, this was the failsafe that would kill Malgax.

Albedo looked at Malgax with a cruel smile before pressing the button on the grey box, causing Malgax to spark before turning into a puddle of red with hints of Purple blood. "Sorry, But I this new universe will be mine to rule and I will not share it with an inferior being such as you." he said this while activating the Dimensional Gate causing a red portal to be opened before walking through.

*In Ben's Training Room*

"You want me to travel to another universe with no way back to stop Albedo from taking over that universe." Ben asked this while trying not to lose his cool about the one who killed his Mom & Dad as well as his Grandpa.

"Precisely Ben though this universe does have heros none know what Albedo is capable of and should you not intervene many will die before that universe submits to his rule. I know this is asking for a lot from you Benjamin, but being a hero requires some sacrifice and though you may not like it at first you can start over no one will know who you are." Paradox pleaded with Ben to do this for him. Ben took a moment to think before sighing and saying OK to paradox. "Thank you now pack up what you need in this storage cube, when you get there you should already have enough money to last until forever and you may experience some changes to yourself physically but don't worry and remember to be a kid and to have some fun." With Ben finishing putting the last of his stuff in the small cube the last things to be put in the cube was the Omnitrix, the Tenn-Speed, his HoverBoard, and a bunch of photos of his family and friends. When done Ben was confused about what Paradox meant, and before he was able to ask what he meant by "changes" and "be a kid" he fell through a blue portal.

The next thing he knew he felt himself slamming into the ground before getting up and hearing two people giggling at what just happened to him. Guessing it was Amy and Zoe he said "Will you two be quiet and now that we are in a new Universe you can't talk until we have a secure base or I'm in my armor so now I need you two to activate cloaking mode so no one will see you." His only confirmation that they understood his orders was his Gauntlets suddenly disappearing.

Looking around found he was in alley way and that his Storage Cube and a green with white lining wallet was at his feet. Grabbing the items he looked in the wallet and saw that there was a note that had his account info on it and his ID which said he was born in a place called Keystone City, but what really caught his Attention was that his picture in his ID was what he looked like when he was 14. "Ahhhh what the hell happen to me? This is so not cool. Great I have to go back to school now or else people will start to wonder. At least that will help me get to know about this universe better." Ben said this his voice going from shock to defeat to acceptance. Pocketing the wallet and cube he exited the alley and make his way to see where he was and to find a place to set up shop.

(AN: For pictures of Fusion Aliens go to .com and search #BiomnitrixUnleashed that will have the designs I will use and I do not own these pictures so please support the guy who actually made it especially since I did not ask Permission.)