Taking place a few weeks after where Ben 10: Alien Force leaves off, Ben 10: Ultimate Alien follows the now sixteen-year-old Ben. The Omnitrix has been destroyed and Ben must learn to master the secrets of the new Ultimatrix, a gauntlet-like version of the old Omnitrix that not only gives him access to all of his original powers and abilities, but also allows him to evolve his alien forms into even stronger and even more powerful versions (called "ultimate forms").
Movie star Jennifer Nocturne, who is not in her right mind, teams up with the evil Captain Nemesis.Watch Now:Amazon
Ben 10,000 returns to help Ben battle a new, dangerous threat.Watch Now:Amazon
Azmuth reveals how Sir George got his sword and slayed Dagon, and the team decides to make a deal with the First Knight.Watch Now:Amazon
The six Ultimate Forms demand their freedom from the Ultimatrix.Watch Now:Amazon
Old George brings the Forever Knights in one group in order to vanquish every alien being on Earth.Watch Now:Amazon
Julie joins a fanatical group who, unbeknownst to her, have discovered Vilgax and worship him.Watch Now:Amazon
A day in the hectic life of Gwen Tennyson.
Ben, Gwen, and Kevin are forced to go through basic training at the Plumbers' Academy.Watch Now:Amazon
An evil creature released from another dimension has plans to enslave the human race for its master.Watch Now:Amazon
The team battles a new, dangerous threat in the Pacific Ocean.Watch Now:Amazon
When Baz-El gets captured, it's up to Ben and the others to rescue him.Watch Now:Amazon
Ben finds himself in an inescapable situation when Techadons, custom-made to destroy him, start coming after him.Watch Now:Amazon
The team takes a look at the real purpose of Area 51 and have to recapture an escaped alien prisoner.
Vilgax betrays Dagon so that he can absorb all of his power to destroy his one true enemy: Ben Tennyson.Watch Now:Amazon
Dr. Animo returns with an army of dragon-like mutants, while Ben has his own problems with his new transformation, Juryrigg.Watch Now:Amazon
Ben, Gwen, and Kevin set out to rescue Charmcaster from Ledgerdomain, but, unbeknownst to them, Charmcaster has plans of her own.Watch Now:Amazon
A mysterious weapon master from Techadon visits Earth and wants the Ultimatrix to enhance his creations.Watch Now:Amazon
Max tells the kids about his first encounter with aliens and the story of how he and Verdona met and fell in love.Watch Now:Amazon
The Flame Keepers' Circle try to release Dagon from his dimension, but Vilgax is released instead.Watch Now:Amazon
Darkstar finds his way into Ledgerdomain, where he seduces Charmcaster, using her energies in his latest attempt to destroy Ben, Gwen, and Kevin.Watch Now:Amazon
Albedo tries to reclaim the Ultimatrix from Ben by transporting him into one of his own worst nightmares.Watch Now:Amazon
The nanochips are back, and have disguised themselves as Julie.Watch Now:Amazon