Ben's secret identity is exposed, casting him into the spotlight. Elsewhere, an alien plans to detonate a nuclear bomb.
Ben uses Echo Echo to make two clones of himself to attempt to be in three places at once.
Zombozo, Charmcaster, and Vulkanus form an alliance and plan to ambush Ben's parents.
Will Harangue comes up with a mastermind plan to put an end to Ben, the 'menace'.
The real story behind Aggregor and his escaped prisoners is revealed.
After Kevin accidentally releases Aggregor's third prisoner from a suit that protects others from his radiation, the gang has to stop him from radiating the Earth!
The gang encounter Argit, who has teamed up with the Forever Knights and Aggregor's fourth prisoner.
Ben accidentally gets fused with Aggregor's fifth prisoner who has no plans of getting out of his body!
Ben's childhood hero makes a comeback while he's on a date with a beautiful, young movie actress.
Aggregor, having recaptured the five aliens, puts his ultimate plan into action.
Ben must stop the newly transformed and extremely dangerous Aggregor from attaining the first piece of the Map of Infinity.
Cash and J.T. take credit for Ben's successes, so Psyphon comes back thinking J.T. and Cash were responsible for Vilgax's defeat!
Ben and the gang travel to a water planet in order to stop Aggregor from obtaining the second piece of the Map of Infinity.
Gwen is forced to team up with her nemesis, Charmcaster, when the team finds themselves to have to stop Aggregor!
With the fourth piece of the Map of Infinity almost in Aggregor's clutches, the gang chase him through the artificial planetoid known as the Perplexahedron.
When Aggregor goes after the limitless power of Alien X, the gang are forced to do whatever it takes...
Old feelings resurface when Kevin returns to the Null Void that housed him for years.
Argit asks for protection from Ben and Gwen after Kevin decides to finish him off.
When Ben and Gwen are faced with an unexpected enemy, Gwen turns to Darkstar for help.
Gwen and Ben have to do whatever it takes to bring down the "mad dog" Kevin.
The gang meet a new girl called Eunice and everything is going well... until Sunder shows up for her.
When Baz-El gets captured, it's up to Ben and the others to rescue him.
While looking for a story to put on his site, Jimmy sees a strange meteorite fall to Earth.
The team are called in to investigate a dispute in the small country of Zarkovia. Once there, they discover an old enemy is about to be unleashed.
Gwen is infuriated by the prospect of her cousin paying the team a visit, and it only gets worse when it is uncovered that her cousin is not entirely human...
The gang face the swarm again, but this time with a new, more powerful queen.
Ben 10,000 returns to help Ben battle a new, dangerous threat.
An evil creature released from another dimension has plans to enslave the human race for its master.
Ben, Gwen, and Kevin are forced to go through basic training at the Plumbers' Academy.
A day in the hectic life of Gwen Tennyson.
The team takes a look at the real purpose of Area 51 and have to recapture an escaped alien prisoner.
Max tells the kids about his first encounter with aliens and the story of how he and Verdona met and fell in love.
A Xenocyte Queen takes over the Arachnichimps' home planet.
Ben finds himself in an inescapable situation when Techadons, custom-made to destroy him, start coming after him.
Old George brings the Forever Knights in one group in order to vanquish every alien being on Earth.
Julie joins a fanatical group who, unbeknownst to her, have discovered Vilgax and worship him.
Albedo resurfaces, and he's making money off of Ben's fame.
The nanochips are back, and have disguised themselves as Julie.
The six Ultimate Forms demand their freedom from the Ultimatrix.
Ma Vreedle plans to create a clone army of her newest spawn, using all of Earth's saltwater as a key ingredient in the cloning process.
The team battles a new, dangerous threat in the Pacific Ocean.
A one hour crossover episode between Ben 10: Ultimate Alien and Generator Rex in which Ben Tennyson accidentally travels to Rex Salazar's dimension. After quarrels with each other, the two finally work together to stop a threat once created by Rex's brother, the Alpha Nanite (Michael Emerson).
Vilgax and the Flame Keepers' Circle duel George and the Forever Knights, who oppose their goals of reviving Dagon.
Azmuth reveals how Sir George got his sword and slayed Dagon, and the team decides to make a deal with the First Knight.
A mysterious weapon master from Techadon visits Earth and wants the Ultimatrix to enhance his creations.
Ben, Gwen, and Kevin set out to rescue Charmcaster from Ledgerdomain, but, unbeknownst to them, Charmcaster has plans of her own.
Movie star Jennifer Nocturne, who is not in her right mind, teams up with the evil Captain Nemesis.
Dr. Animo returns with an army of dragon-like mutants, while Ben has his own problems with his new transformation, Juryrigg.
Darkstar finds his way into Ledgerdomain, where he seduces Charmcaster, using her energies in his latest attempt to destroy Ben, Gwen, and Kevin.
Albedo tries to reclaim the Ultimatrix from Ben by transporting him into one of his own worst nightmares.
The Flame Keepers' Circle try to release Dagon from his dimension, but Vilgax is released instead.
Dagon breaks out of the seal and turns all humans into Flame Keepers' Circle soldiers.
Vilgax betrays Dagon so that he can absorb all of his power to destroy his one true enemy: Ben Tennyson.
