Ben 10: Ultimate Alien — Season 1

Aired 23 April 2010 • 23 min

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.

Aired 30 April 2010 • 23 min

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.

Aired 7 May 2010 • 23 min

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.

Aired 14 May 2010 • 23 min

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.

Aired 21 May 2010 • 23 min

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

Aired 28 May 2010 • 23 min

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.

Aired 4 June 2010 • 23 min

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

Aired 11 June 2010 • 23 min

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.

Aired 18 June 2010 • 23 min

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

Aired 10 October 2010 • 23 min

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.

Aired 10 October 2010 • 23 min

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

Aired 15 October 2010 • 23 min

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.

Aired 22 October 2010 • 23 min

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

Aired 29 October 2010 • 23 min

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.

Aired 5 November 2010 • 23 min

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.

Aired 12 November 2010 • 23 min

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.

Aired 19 November 2010 • 23 min

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.

Aired 3 December 2010 • 23 min

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

Aired 10 December 2010 • 23 min

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.

Aired 10 December 2010 • 23 min

Final confrontation with Kevin. While Gwen makes a last ditch effort to save Kevin, Ben fights an all out battle with Kevin.