With his secret identity now revealed to the world, Ben Tennyson continues to fight evil as a superhero with the help of the newly acquired Ultimatrix.
Ben 10: Ultimate Alien (Season 1)
Fame (Episode 1) 7.3
Writer: Dwayne McDuffie
Air date: 2010-04-23
Runtime: 23 min
Overview: Ben's secret is out. As Ben deals with his newfound fame, a new threat emerges as a thief steals parts of a new advanced spaceship from NASA.
Duped (Episode 2) 8.4
Writer: Len Uhley
Air date: 2010-04-30
Runtime: 23 min
Overview: Ben is supposed to attend a tournament to support his girlfriend, but the Forever Knights are trying to break into a museum. Ben tries to use the Ultimatrix to handle all his obligations.
Hit 'Em Where They Live (Episode 3) 8.5
Writer: Len Wein
Air date: 2010-05-07
Runtime: 23 min
Overview: After Jimmy Jones reveals Ben's identity, some of his enemies (such as Zombozo, Rojo, Charmcaster, Vulkanus, and Sevenseven) team up to try to attack his family. Now Ben and his friends have to protect them no matter what.
Video Games (Episode 4) 8.4
Writer: Joe Casey
Air date: 2010-05-14
Runtime: 23 min
Overview: Ben gets an offer to star in his own video game, but the designer's real motives are part of a plan to destroy Ben.
Escape from Aggregor (Episode 5) 8.8
Writer: Charlotte Fullerton
Air date: 2010-05-21
Runtime: 23 min
Overview: The team encounters another alien who escaped from Aggregor and, through him, learns more about Aggregor's goals.
Too Hot to Handle (Episode 6) 8.4
Writer: Marty Isenberg
Air date: 2010-05-28
Runtime: 23 min
Overview: P'Andor, escaped from Aggregor, now wants help to escape his encapsulating suit, but Kevin's the first to perceive that that's a fatally bad idea.
Andreas' Fault (Episode 7) 9.0
Writer: Ernie Altbacker
Air date: 2010-06-04
Runtime: 23 min
Overview: Then team encounters another of Aggregor's escaped prisoners, Andreas, whom Argit is using as part of a scheme against the Forever Knights.
Fused (Episode 8) 8.8
Writer: Len Uhley
Air date: 2010-06-11
Runtime: 23 min
Overview: Ra'ad, the last of Aggregor's escaped prisoners, attacks Ben and informs the team of the true fate of his comrades. He finds a safe hiding place but one that endangers Ben in the process.
Hero Time (Episode 9) 8.8
Writer: Steven Barnes
Air date: 2010-06-18
Runtime: 23 min
Overview: Ben meets his hero, Captain Nemesis, who's become jealous of all the attention Ben attracts.
Ultimate Aggregor (Episode 10) 8.6
Writer: Joe Casey
Air date: 2010-10-10
Runtime: 23 min
Overview: Aggregor has all five aliens. The Plumbers manage to disable Aggregor's ship, forcing Aggregor to find a new way to absorb their powers. The team makes a last ditch effort to save the alien prisoners.
Map of Infinity (Episode 11) 9.0
Writer: Joe Casey
Air date: 2010-10-10
Runtime: 23 min
Overview: Aggregor has absorbed all the powers of his captured aliens. Now he's after the Map of Infinity.
Reflected Glory (Episode 12) 8.0
Writer: Peter David
Air date: 2010-10-15
Runtime: 23 min
Overview: Cash and JT convince the team to allow them to take credit for the team's actions so they can earn money for Cash's mother's operation.
Deep (Episode 13) 8.0
Writer: Marty Isenberg
Air date: 2010-10-22
Runtime: 23 min
Overview: Aggregor is after the next piece of the map on a watery planet.
Where the Magic Happens (Episode 14) 9.0
Writer: Joe Casey
Air date: 2010-10-29
Runtime: 23 min
Overview: Aggregor escapes to a magical dimension. Gwen asks for Charmcaster's help to pursue him. The team learns about Charmcaster's past and why she's willing to help them now.
Perplexhahedron (Episode 15) 8.8
Writer: Joe Casey
Air date: 2010-11-05
Runtime: 23 min
Overview: With the fourth piece of the Map of Infinity almost in Aggregor's clutches, the gang chase him through the artificial planetoid known as Perplexahedron.
The Forge of Creation (Episode 16) 9.4
Writer: Joe Casey
Air date: 2010-11-12
Runtime: 23 min
Overview: As the team makes its final attempt to stop Aggregor, they find an unexpected ally, and one person will make a fateful decision with lasting repercussions.
Nor Iron Bars a Cage (Episode 17) 8.8
Writer: Joe Casey
Air date: 2010-11-19
Runtime: 23 min
Overview: Kevin's out for payback on anyone who has ever crossed him. His next stop is a prison in the Null Void. Ben and Gwen try to stop him, where Ben comes to a grim decision.
The Enemy of My Enemy (Episode 18) 8.8
Writer: Len Uhley
Air date: 2010-12-03
Runtime: 23 min
Overview: Argit asks Ben and Gwen for protection from Kevin, so they take him to the nearest Plumbers Academy, but that won't stop Kevin.
Absolute Power (1) (Episode 19) 8.6
Writer: Charlotte Fullerton
Air date: 2010-12-10
Runtime: 23 min
Overview: Kevin starts going after Plumbers kids to gain more power. Ben and Gwen continue to argue about how to handle the situation. Gwen tries to find someone who will help her cure Kevin.
Absolute Power (2) (Episode 20) 8.6
Writer: Joe Casey
Air date: 2010-12-10
Runtime: 23 min
Overview: Final confrontation with Kevin. While Gwen makes a last ditch effort to save Kevin, Ben fights an all out battle with Kevin.
Seasons
Episodes 20
Episodes 32