| Villain | Description | Key Arc | | :--- | :--- | :--- | | | An Osmosian villain from the Andromeda Galaxy who kidnaps five powerful aliens to absorb their powers. | Main antagonist of Season 1. | | Ultimate Kevin | After absorbing the Ultimatrix's energy, Kevin becomes a power-crazed, amalgamated monster. | Main antagonist of the Season 1 finale. | | Sir George | The immortal founder of the Order of the Knights of Ascalon and the original wielder of the Ascalon sword. | Secondary antagonist of the Dagon arc. | | Dagon | A nigh-omnipotent, multi-dimensional entity of pure evil whom Sir George sealed away millennia ago. | Main antagonist of Season 3. | | Vilgax | Ben's original nemesis, a powerful Chimera Sui Generis. He returns in this series to absorb Dagon's power. | Main antagonist of the series finale. | | Will Harangue | A sleazy, influential news anchor who uses his media platform to turn the public against Ben at every opportunity. | Recurring antagonist. |
"Simian Says" – DNAliens return on a distant planet after a dynamic virus gets loose. Season 3: The Dagon Invasion (Episodes 33–52)
, a planet-destroying sword, to defeat a god-powered Vilgax before Azmuth replaced the buggy Ultimatrix with the finalized, perfect Omnitrix. from this era or a list of every ultimate form shown in the show?
The focus shifts to Sir George, the immortal founder of the Forever Knights, who seeks to prevent the return of Dagon, an extra-dimensional energy being. index of ben 10 ultimate alien
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– The sentient Ultimate alien forms trap Ben inside the Ultimatrix, demanding their freedom.
The Transmogrification of Eunice (The team protects a mysterious girl) | Villain | Description | Key Arc |
– Ben's old enemies target his loved ones after his identity is revealed.
A Knight to Remember (Sir George prepares Ascalon to face the Dagon)
Ben 10: Ultimate Alien takes place just a few weeks after the dramatic finale of Ben 10: Alien Force . Ben Tennyson is now 16 years old. His secret identity has been leaked to the world by a young fan named Jimmy Jones, turning Ben into an overnight global celebrity. While the public is divided—some view him as a superhero, others like news anchor Will Harangue see him as a menace—Ben must navigate his newfound fame while continuing to protect Earth from cosmic and terrestrial threats. | Main antagonist of the Season 1 finale
Replaces pure physical strength with biological organic missile launchers on his hands and armored mace-tails.
"Map of Infinity" – The team travels to a dangerous planet to stop Aggregor from obtaining a cosmic artifact.
– Ben meets his 10-year-old self while trying to stop Aggregor from absorbing a Celestialsapien baby.
Ultimate Aggregor (Aggregor begins absorbing his captives)
Ben 10: Ultimate Alien is the third installment in the original Ben 10 franchise, premiering on Cartoon Network on April 23, 2010, and concluding on March 31, 2012. It directly follows the events of Ben 10: Alien Force , picking up with the Tennyson family a few weeks later.