Ben 10: Ultimate Alien

1 - Fame

Air Date: April 23, 2010

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.

2 - Duped

Air Date: April 30, 2010

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.

3 - Hit 'Em Where They Live

Air Date: May 7, 2010

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.

4 - Video Games

Air Date: May 14, 2010

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.

5 - Escape from Aggregor

Air Date: May 21, 2010

The team encounters another alien who escaped from Aggregor and, through him, learns more about Aggregor's goals.

6 - Too Hot to Handle

Air Date: May 28, 2010

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.

7 - Andreas' Fault

Air Date: June 4, 2010

Then team encounters another of Aggregor's escaped prisoners, Andreas, whom Argit is using as part of a scheme against the Forever Knights.

8 - Fused

Air Date: June 11, 2010

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.

9 - Hero Time

Air Date: June 18, 2010

Ben meets his hero, Captain Nemesis, who's become jealous of all the attention Ben attracts.

10 - Ultimate Aggregor

Air Date: October 10, 2010

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.

11 - Map of Infinity

Air Date: October 10, 2010

Aggregor has absorbed all the powers of his captured aliens. Now he's after the Map of Infinity.

12 - Reflected Glory

Air Date: October 15, 2010

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.

13 - Deep

Air Date: October 22, 2010

Aggregor is after the next piece of the map on a watery planet.

14 - Where the Magic Happens

Air Date: October 29, 2010

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.

15 - Perplexhahedron

Air Date: November 5, 2010

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.

16 - The Forge of Creation

Air Date: November 12, 2010

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.

17 - Nor Iron Bars a Cage

Air Date: November 19, 2010

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.

18 - The Enemy of My Enemy

Air Date: December 3, 2010

Argit asks Ben and Gwen for protection from Kevin, so they take him to the nearest Plumbers Academy, but that won't stop Kevin.

19 - Absolute Power (1)

Air Date: December 10, 2010

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.

20 - Absolute Power (2)