Ben 10: Ultimate Alien is an American animated television series, the third entry in Cartoon Network's Ben 10 franchise created by team Man of Action (a group consisting of Duncan Rouleau, Joe Casey, Joe Kelly, and Steven T. Seagle), and produced by Cartoon Network Studios.
Not recognizing one of the aliens on Jimmy's website, Ben and his team travel to Orlando, Florida, the site where the photograph was taken, to investigate.
Ben's team is brought into custody by the U.S. military, where Air Force Colonel Rozum explains that the alien in question has been stealing parts from a NASA interstellar rocket called Orion.
Eventually, all three Bens reunite to help defeat the Forever Knights to prevent them from stealing ancient alien battle armor.
In reality, however, Oliver is in the employ of Will Harangue, who is developing a battle robot called the Stalker to target and destroy Ben by analyzing and predicting his moves.
Galapagus explains that he was one of the five aliens from the Andromeda Galaxy captured by Aggregor, who brought him into a cell on his spaceship along with the other prisoners: Bivalvan, Ra'ad, P'andor, and Andreas.
The aliens manage to escape, but are divided on what action to take: Bivalvan, Ra'ad, and Galapagus send a distress signal out to nearby Plumbers, while P'andor and Andreas confront Aggregor.
Aggregor defeats and recaptures them, subsequently killing Magister Prior Gilhil, the Plumber responding to their distress call.
Kevin takes on an underground job to open a safe for a large sum of money, only to discover that the employer is P'andor, one of the missing Andromeda aliens, who wishes to be freed from a containment suit that he has been kept in.
Captured in the abandoned military base at Los Soledad, Ra'ad reveals that Aggregor recaptured the other four aliens and blames Ben for it.
Vampire Summer movie star Jennifer Nocturne is attacked by mercenaries, but rescued in a joint effort by Ben and Carl Nesmith, a.k.a.
It is then revealed that Nesmith secretly orchestrated the attack on Jennifer to gain popularity, and is conspiring with Will Harangue to boost his public image.
Ben and his team confront Aggregor, with Kevin attempting to reason with him, insisting that energy absorption causes Osmosians to lose their sanity.
Ben, Gwen, and Kevin travel to the tidally locked planet Mykdl'dy to retrieve the first piece of the Map of Infinity, encountering a group of Necrofriggians and entering an ancient temple.
Inside of the temple, the trio evade a series of traps, but end up at the mercy of Aggregor, who takes the piece of the Map of Infinity and leaves.
Ben and his team defeat the Forever Knights but are suddenly attacked by Psyphon, Vilgax's former subordinate, who saw the web show and wishes to kill Cash and J.T.
The team pursues Aggregor to the interior of the Perplexahedron, discovering that it is an enormous, shifting maze designed by Professor Paradox to protect the final piece of the map from all who are unworthy.
On Galvan Mark II, Azmuth chastises Ben, Gwen, and Kevin for their failure to stop Aggregor from acquiring the completed Map of Infinity.
The episode focuses on the daily life of Gwen as she juggles her various responsibilities, including school, her mother's errands, her friend Emily's piano concert, and the threat of Dr. Animo.
As Gwen struggles to concurrently carry out her various tasks, she ultimately helps Ben and Kevin defeat Dr. Animo, and makes it to Emily's concert just in time to see her finish.
He reveals that President John F. Kennedy intends to send humans to the Moon in order to meet alien visitors on a level playing field, and invites Max to join the Apollo program as an astronaut.
Ben and the team are summoned by Cooper Daniels to investigate, where they meet Colonel Rozum and discover a layer of metal at the bottom of the crater that doesn't originate from Earth.
Rozum reluctantly reveals that beneath the metal is a holding facility containing hundreds of aliens, who have been illegally detained by the Air Force over the course of fifty years after being deemed a threat to national security.
Ben, Gwen, and Kevin confront Prisoner 775, who reveals that he was captured unjustly by the Air Force, and while imprisoned, his family members were killed on his home planet.
Azmuth agrees to take the ultimates to a planet where they can live in peace, and Kevin offers to buy food for his "best girl" and his "best friend."
George is still alive in the present day, possessing immortality, and has left the Forever Knights in order to retrieve his sword, which is buried in Dagon's heart.
At the location, a battle breaks out between the Forever Knights and the Esoterica, and Vilgax absorbs the power from George's sword and Dagon's heart.
Gwen deduces that Jennifer is suffering from Stockholm syndrome and has begun to identify with Nesmith due to her feelings that her old life was empty and meaningless.
Dr. Animo is unexpectedly paroled from prison and starts up a company selling eggs, which in fact contain mutant dinosaurs which he wishes to distribute around the world.
Benjamin "Ben" Kirby Tennyson teams up with sixteen-year-old Rex Salazar to save both of their Earths from a very powerful and deadly nanite-of-nanites called "the Alpha Nanite", the enhanced technological force of the Omega Nanite which resides within Rex's body, having integrated into his DNA one year ago that entered New York City through a swirling vortex from an entirely different alternate universe, the same way Ben Tennyson arrived in the city as Humungosuar.