As of July 2026, Ben 10: Ultimate Alien Season 1 aired in 2010 with 20 episodes — streaming now on HBO Max. Full episode guide and where to watch below.

Ben 10: Ultimate Alien Season 1 poster

← Back to Ben 10: Ultimate Alien

Ben 10: Ultimate Alien Season 1

2010 20 Episodes Animation · Action & Adventure ⭐ 8/10

Right now you can watch Ben 10: Ultimate Alien Season 1 on and — and it goes further with its ideas than most genre entertainment bothers to. Across 1 season, the show has had time to find its rhythm and keep it. Its 8/10 TMDB score, built from 887 ratings, reflects a title that consistently delivers. Yuri Lowenthal sets the tone, and the world-building does the rest. Available now — press play and find out why people keep recommending it.

Whatever else is competing for your attention this week, Ben 10: Ultimate Alien Season 1 is worth clearing space for. Ben 10: Ultimate Alien Season 1 uses its genre premise as cover for asking bigger questions. Season 1 of Ben 10: Ultimate Alien includes 20 episodes. It aired from April 2010 to December 2010. This season stars Yuri Lowenthal, Ashley Johnson and Greg Cipes. Yuri Lowenthal and Ashley Johnson lead a cast that brings real weight to the material. It was aired in 2010. What separates Ben 10: Ultimate Alien Season 1 from lesser genre entertainment is a willingness to let the concept cost the characters something. The consistency throughout is what elevates it — not every moment is the best, but none of them are a reason to stop watching.

Viewers burned by ambitious sci-fi that could not sustain its premise should give Ben 10: Ultimate Alien Season 1 a chance. It rewards viewers regardless of what else is in their watch history. Best experienced as a single, sustained watch if your schedule allows. Yuri Lowenthal anchors it with a performance that makes the more abstract moments feel personal. If you have been burned by ambitious sci-fi before, this is the exception.

📡 Where to Watch Ben 10: Ultimate Alien Season 1

🇦🇺 Australia

HBO Max Amazon Channel

🇺🇸 United States

Spectrum On Demand

🇨🇦 Canada

TELETOON+ Amazon Channel

🇳🇿 New Zealand

HBO Max Amazon Channel

🎬 Ben 10: Ultimate Alien Season 1 — Episode Guide

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.

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

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.

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

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

Too Hot to Handle

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.

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

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.

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

Ultimate Aggregor

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

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

Reflected Glory

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.

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

Where the Magic Happens

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

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

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

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

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)

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)

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

🎭 Cast of Ben 10: Ultimate Alien Season 1

Yuri Lowenthal

Ben Tennyson (voice)

Ashley Johnson

Gwen Tennyson (voice)

Greg Cipes

Kevin Levin (voice)

Dee Bradley Baker

Dee Bradley Baker

Humungosaur (voice)

📋 All Seasons of Ben 10: Ultimate Alien

Never Lose Track of Ben 10: Ultimate Alien

TV Butler Pro lets you search every streaming service in seconds, tracks what you've watched, and works completely free. No app download needed.

🎩 Try TV Butler Pro Free