It had been 6 months since the battle with Ultimate Kevin and Hope was still devastated. She had secluded herself in Hex's old library and she rarely ate. Ben was devastated that the guy he considered a brother turned on him and had been killed by his other friend. Gwen was also devastated by the fact that Kevin flew off as a monster because she started to have a crush on him. Ben and Gwen started going to Bellwood middle school while Hope started at Bellwood highschool.Rin however was much different, he had been living in his cave for the 6 months after the large battle. He had to forage and hunt to survive but t was going to change. One day when Rin was hunting a glowing symbol appeared in the air and started spinning. A female figure came flying out of the portal and Rin slapped the Ultimatrix and became Fasttrack but she grabbed Rin before he could do anything and dragged him through. When he got to the other side he noticed it looked a lot different. There were aliens and humans commingled together and there was a large statue of two people with a message on the bottom that said, "Rin 10,000 and Ben 10,000 heroes of heroes."
Rin was about to run and find out what was going on when some random alien kid said, "Lookin' nice Rin 10k."
He turned around to the woman who brought him here and he was able to get a clear look at her. She was wearing a blue cloak with blue and purple clothes underneath and 5 charms going down her right hand, she had green eyes and Red/orange hair and was a bit shorter than Rin.
"Who are you?" Rin asked defensively.
"You don't recognize me? I guess that's what happens when you time travel 20 years backward. It's me, Gwen." She said.
'G-Gwen what are you talking about time travel? How did you find me." Rin asked confused.
"You and Ben's future selves are in danger and I brought you to help. I don't know why you were in the woods though." Gwen answered.
"When did you intend to travel to?" Rin asked.
"To just after you recruited Kevin to the team. Isn't that what happened before I got you." She asked.
"I'm the Rin who already betrayed the group and worked with Albedo, it's been six months since that happened," Rin explained.
Gwen looked down and saw a red Ultiatrix and realized he was telling the truth.
"Either way we need your help, please," Gwen said.
"Fine, I'll help but I want to go back to my isolation after. Deal?" Rin said laying out the terms.
"Fine, I'll return you to your isolation after." She said.
Rin slapped the Ultimatrix and turned back into a human. Gwen grabbed onto him and she flew off. When they got to their destination Rin saw Fourarms and Humungosaur getting defeated by an alien with a mecha suit. Gwen let him land and he said, "For more powerful versions of myself and Ben you accel at getting destroyed in combat."
They looked back and saw 15-year-old Rin next to Gwen.
"WHAT IS HE DOING HERE GWENDOLYN?! SEND HIM BACK!" Rin 10,000 yelled.
Rin activated his Ultimatrix and turned into Upgrade, he jumped at the robotic alien and swiftly defeated it by short-circuiting it. He turned to his future self and said, "How did I grow up to be stupid enough to use Humungosaur against a stronger robotic enemy?"
"For your information, we were using even stronger versions of Humungosaur and Fourarms than from your time period." Ben 10,000 said.
"Still why didn't you think to use Upgrade to stop it? It took me 10 seconds to beat a threat that was utterly demolishing you too. And why did my future self at least use an Ultimate form?" Rin said angered.

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Ben 10 and the Ultimatrix user
Fanfiction(This story is how I would write Alien Heroes by @Sovereign343 the credit for the idea goes to him I just wanted to write it in my way. This is also somewhat co-written by @BenCowden2 for all the help and inspiration he has given me.) Ben, Gwen, and...