The first season (Episodes 1–20) focuses on two major shifts: Ben’s secret identity being leaked to the public by young fan Jimmy Jones, and the arrival of the Osmosian villain .
This season introduces Eunice , a "living Omnitrix" who absorbed Gwen's DNA, and sees the return of Ben 10,000 . ben 10: ultimate alien all episodes
Fans see the return of Elena Validus from the Alien Swarm movie and the introduction of Gwen’s cousin, Sunny. Season 3: The Dagon and Vilgax Finale The first season (Episodes 1–20) focuses on two
Aggregor kidnaps five powerful aliens from the Andromeda Galaxy to absorb their powers and reach the "Forge of Creation" to obtain the Ultimate Prize. Season 3: The Dagon and Vilgax Finale Aggregor
To stop a fully powered Aggregor, Kevin Levin makes the ultimate sacrifice, absorbing the Ultimatrix's energy. This saves the universe but drives him insane, turning him into Ultimate Kevin and forcing Ben to consider a lethal solution to stop his best friend. Season 2: New Allies and Galactic Threats