Time Travel Arc

Future for Ben and Gwen
While trying to celebrate Max's birthday, they get teleported to the future. They find out that future Gwen has teleported them there so they can help. Ben 10,000 has different versions of aliens, such as future Cannonbolt. He also has three new aliens: Buzzshock, Spitter, and Articguana.

Not only did the main characters change, so did the villains such as Dr. Animo and Vilgax. Dr. Animo is now more animal-like, and Vilgax hasn't changed that much.

Alternate Future
In an episode of the alternate future that doesn't feature regular Ben or Gwen, Ken, on his birthday becomes friends with Devlin Levin, a descendent of Kevin Levin, who is bad in the future. They play hoverboard together. Kevin escapes the Null Void, but Ben 10,000 defeats him as Way Big.

Kevin returns to the Null Void, but Devlin lets him out again. Ken finds out the relationship of Devlin and Kevin. Kevin turns into a mutant form by absorbing aliens in the Null Void. Together, Ken and Ben defeat Kevin's form.

Meet Professor Paradox
The trio meet Professor Paradox, a time traveler that appears in a lot of later episodes in an uninhabited place. Kevin and maybe Ben are surprised about how he can travel so fast. Paradox says that he had a time machine accident a while ago, and Hugo got sucked in. A blue snake-like aging monster is traveling around. Kevin tried to defeat it, but it aged him.

The four try to solve the case about it's history. It later touches Kevin's car, which makes it age to a junky red old beat up car. Paradox takes Ben, Gwen, and Kevin to the moon of the future and find Earth. When they travel back, Professor Paradox holds off the monster. Ben makes Paradox take them back to the accident. The trio go in and find Hugo trying to not get sucked in. Ben uses Humungousaur to pull Hugo back. That causes the monster to go away, which was actually Hugo. Paradox takes Hugo through a time warp.

Gwenx3
Gwen tries to stop Kevin from being mutated the second time by using a time travel spell from one of Hex's old books. Professor Paradox warns her about the trouble, but she doesn't listen. Gwen travels to the past when Ben tried to hack the Omnitrix and convinced him to not do it. It worked, but Gwen is shocked when she finds out Charmcaster and Hex are taking over.

Paradox tells Gwen that Kevin was not able to fight Charmcaster and Hex without being able to shapeshift his hands. Gwen fights the two, then activates the spell again to erase the first Gwen's memory and tell her second self to not convince Ben to not hack the Omnitrix. Her and her second self time travel back to their original times and everything is normal again.



Young Ben, Meet New Ben
In The Forge of Creation, Professor Paradox take Ben, Gwen, and Kevin to the Forge of Creation to stop Aggregor from absorbing the power of a Celestialsapien. The Rustbucket 3 gets it's wings stuck in two white walls. Ben accidentally falls into a white wall, and saved by Gwen, brings back young Ben from Ben 10.

Young Ben asks questions and thinks Kevin is still bad. He turns into Heatblast while Ben turns into NRG. Ben stops Young Ben. They're real focus is to defeat Aggregor. They arrive where Aggregor is. They both turn into Four Arms on accident.

Aggregor defeats Ben and Gwen. Young Ben tells Kevin to absorb his Omnitrix like before, but Kevin says he needs the real deal and absorbs the Ultimatrix. Defeating Aggregor, he becomes insane and flies away.