– After losing control of Ledgerdomain, Charmcaster teams up with Darkstar to drain Gwen’s magical energy. Kevin and Gwen must patch up their relationship to defeat them.
The series serves as a perfect bridge, concluding the mature themes of Alien Force while setting up the more lighthearted, expansive multiverse of Ben 10: Omniverse . For any Ben 10 fan, and represents the final chapter of the franchise's most cohesive and well-written era.
| Episode | Title | Original Air Date | Plot Summary | | :--- | :--- | :--- | :--- | | | " Fame " | April 23, 2010 | Ben's secret identity is exposed by a young blogger, casting him into the spotlight. Meanwhile, he must stop an alien from detonating a nuclear bomb. | | S1E2 | " Duped " | April 30, 2010 | Ben uses Echo Echo to make clones of himself to be in three places at once, but the plan quickly spirals out of control. | | S1E3 | " Hit 'Em Where They Live " | May 7, 2010 | A villainous alliance of Zombozo, Charmcaster, and Vulkanus plans to ambush Ben's parents at their home. | | S1E4 | " Video Games " | May 14, 2010 | After defeating an old foe, Ben gets to star in his own video game, only to find it's a trap by the corrupt news anchor, Will Harangue. | | S1E5 | " Escape From Aggregor " | May 21, 2010 | The backstory of the villain Aggregor is revealed as five powerful aliens from the Andromeda Galaxy escape from his captivity. | | S1E6 | " Too Hot To Handle " | May 28, 2010 | The team must stop a radioactive alien from inadvertently radiating the entire Earth after his protective suit is damaged. | | S1E7 | " Andreas' Fault " | June 04, 2010 | The gang encounters Argit, who has teamed up with the Forever Knights and Aggregor's fourth prisoner, a gentle giant named Andreas. | | S1E8 | " Fused " | June 11, 2010 | Ben accidentally gets fused with Aggregor's fifth prisoner, a nanotechnology-based alien who has no plans of leaving his body. | | S1E9 | " Hero Time " | June 18, 2010 | Ben's childhood superhero idol makes a comeback, forcing Ben to choose between his hero and saving the day on a date with a celebrity. | | S1E10 | " Ultimate Aggregor " | October 10, 2010 | Aggregor has recaptured all five aliens. He puts his ultimate plan into action and absorbs their powers into himself. | | S1E11 | " Map of Infinity " | October 10, 2010 | Ben learns from Azmuth that Aggregor now seeks the Map of Infinity, a cosmic road map that will lead him to ultimate omnipotence in the Forge of Creation. | | S1E12 | " Reflected Glory " | October 15, 2010 | While Ben is busy, Gwen and Kevin must protect the first piece of the Map of Infinity from a tech-collecting alien bounty hunter. | | S1E13 | " Deep " | October 22, 2010 | To retrieve the second piece of the Map, the team must travel to the bottom of the ocean to an ancient alien city. | | S1E14 | " Where the Magic Happens " | October 29, 2010 | The third piece of the Map is hidden in Ledgerdomain, a magical dimension ruled by the villainous Charmcaster, who takes Gwen hostage. | | S1E15 | " Perplexahedron " | November 05, 2010 | Aggregor and the team enter a shifting, puzzle-like alien construct to retrieve the final piece of the Map of Infinity. | | S1E16 | " The Forge of Creation " | November 12, 2010 | The final confrontation with Aggregor takes place in the Forge of Creation, where a desperate Kevin absorbs the Ultimatrix's power to stop him. | | S1E17 | "...Nor Iron Bars a Cage" | November 19, 2010 | The aftermath of Kevin's madness: The team tracks him to the Null Void, a prison dimension, where he has established his own criminal empire. | | S1E18 | " The Enemy of My Enemy " | December 03, 2010 | Ben and Gwen form an uneasy alliance with the villainous Aggregor to stop the out-of-control Kevin from destroying the universe. | | S1E19 | " Absolute Power: Part 1 " | December 10, 2010 | Ben discovers the only way to stop Kevin is to kill him, leading to a moral crisis as he and Gwen struggle with their promise to save their friend. | | S1E20 | " Absolute Power: Part 2 " | December 10, 2010 | The explosive conclusion: Ben arms his most powerful alien, Ultimate Humungousaur, as he confronts a corrupted Kevin for the final time. | ben 10: ultimate alien all episodes
The story begins with Ben's secret identity being outed to the world by a young fan. While Ben enjoys his fame, a more serious threat emerges:
– Ben, Gwen, and Kevin are assigned to take a mandatory training course at the Plumber Academy. Ben clashes with a rigid, rules-obsessed drill sergeant named Magister Hulka. – After losing control of Ledgerdomain, Charmcaster teams
, the series follows a 16-year-old Ben Tennyson as he navigates worldwide fame following the public exposure of his secret identity. The central mechanic of this era is the Ultimatrix
– Professor Paradox warns the team that Ultimate Aggregor is hunting for the four pieces of the Map of Infinity. The trio travels to a lethal, trap-filled temple on a planet of molten lava. For any Ben 10 fan, and represents the
The first 20 episodes focus on the Osmosian villain, Aggregor, who attempts to absorb the powers of five aliens from the Andromeda Galaxy. This arc culminates in the high-stakes " Forge of Creation " episode, featuring a crossover with young Ben.
October 26, 2023 Subject: Comprehensive Analysis and Log of Ben 10: Ultimate Alien Episodes Status: Series Complete (52 Episodes)
– Ma Vreedle arrives on Earth to breed an army of destructive, cloned Pretty Boy Vreedle dolls, threatening to dry up Earth’s oceans to feed them.
