Ben 10: Ultimate Alien All Episodes [exclusive] -

Ben 10: Ultimate Alien — Complete Series Overview

Ben 10: Ultimate Alien is the third installment in the original Ben 10 animated continuity (following Ben 10 and Ben 10: Alien Force). It aired 2010–2012 and follows teenage Ben Tennyson after his identity as a superhero becomes public. With the Ultimatrix upgraded into the Ultimatrix/Ultimatrix’s successor device (the “Ultimatrix” evolving into the Ultimatrix→Ultimatrix Ultimate forms in-story), Ben gains “ultimate” versions of many aliens and faces new threats while balancing fame, friends, and responsibility.

Key series facts

Episodes: 52 episodes (counting 1990s-style 11–12 minute segments where applicable) across 3 seasons.
Original run: 2010–2012.
Creator (franchise): Man of Action (team: Duncan Rouleau, Joe Casey, Joe Kelly, Steven T. Seagle).
Primary protagonists: Ben Tennyson, Gwen Tennyson, Kevin Levin.
Main antagonists and recurring threats: Aggregor, Albedo, Vilgax, DNAliens, various cosmic-level foes and techno-organic threats.
Tone: Action-adventure with sci-fi, occasional humor, and serialized story arcs about power, responsibility, and alien politics.

Major story arcs and highlights

Public Identity & Consequences: Ben’s identity as a hero is public early in the series; the show explores celebrity, legal scrutiny, and how fame complicates heroics.
The Ultimatrix / Ultimate Forms: The Ultimatrix grants “ultimate” evolutions of several of Ben’s aliens — stronger, often specialized forms with new abilities — changing combat dynamics and stakes.
Aggregor Arc (Season 1–2): Aggregor, an Osmosian wanting to absorb alien powers, is a major early-season antagonist; his schemes involve powerful artifacts and kidnapped aliens.
Albedo & Legacy of the Omnitrix: Albedo (a former Azmuth clone) returns with tech-based plots tied to the Omnitrix’s origin and Ben’s powers.
Cosmic & Multiversal Threats: Later episodes escalate to alien political intrigue, extradimensional consequences, and battles with world-ending stakes.
Character growth: Ben matures but struggles with impulsiveness; Gwen deepens her mastery of magic/energy; Kevin’s moral complexity remains central.

Recommended episode structure (key episodes to watch; spoilers minimized)

Pilot / Early episodes (establish public identity and Ultimatrix): Introduces the show’s premise and Ultimatrix-based threats.
Aggregor-centric arc (several consecutive episodes across seasons 1–2): Core villain arc with high stakes—watch as a continuous storyline.
Mid-series character/development episodes: Standalone stories that deepen Gwen, Kevin, and Ben’s relationships.
Albedo & Omnitrix origin episodes: Important for franchise continuity and Omnitrix lore.
Season finales & culminating episodes: Resolve major arcs and feature big set-piece battles.

Viewing order and completeness

Watch in original broadcast/season order to follow serialized arcs (S1 → S2 → S3).
For full franchise context (optional): watch Ben 10 (original series) → Ben 10: Alien Force → Ben 10: Ultimate Alien → Ben 10: Omniverse, then the 2016 reboot separately.

Where to find episodes

Legal streaming platforms and authorized digital retailers typically carry the series; availability varies by region and over time.

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Ben 10: Ultimate Alien spans 52 episodes across three seasons. Set a few weeks after the events of Ben 10: Alien Force

, the series follows 16-year-old Ben Tennyson as he balances a newfound global celebrity status with the duty of defending Earth using the Ultimatrix Arc 1: The Aggregor Saga (Season 1)

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:

, an Osmosian who kidnaps five powerful aliens from the Andromeda Galaxy. The Mission

: Ben, Gwen, and Kevin travel across the galaxy to stop Aggregor from absorbing the powers of these "Andromeda Five." The Outcome ben 10: ultimate alien all episodes

: Aggregor succeeds and attempts to reach the "Forge of Creation" to gain the power of a Celestialsapien (Alien X's species). Ultimate Kevin

: To stop him, Kevin is forced to absorb the energy of the Ultimatrix. He defeats Aggregor but loses his sanity and humanity, becoming a vengeful monster that Ben must eventually take down and cure. Arc 2: The Mysterious Old Enemies (Season 2)

The second arc focuses on recurring threats and character-driven episodes, including the return of classic villains like Dr. Animo and Charmcaster. Eunice and the Unitrix

: The team discovers Eunice, a human-like prototype of the Omnitrix (the Unitrix). Ben 10,000 Returns

: Ben meets his future self, who helps him stop Eon, a villainous alternate version of Ben, from destroying all timelines. Arc 3: Dagon and the Ultimate Enemy (Season 3)

The final arc centers on an ancient, extra-dimensional entity known as

and a religious cult called the "Flame Keepers' Circle" that worships him.

Ben 10: Ultimate Alien follows 16-year-old Ben Tennyson as he navigates a world where his secret identity has been revealed, all while mastering the Ultimatrix, a device that allows his alien forms to "evolve" into more powerful versions. The series consists of 52 episodes originally aired between 2010 and 2012, primarily divided into two major story arcs: the Aggregor/Andromeda saga and the Dagon/Forever Knights war. Season 1: The Andromeda and Aggregor Arc

The first 20 episodes focus on the Osmosian villain Aggregor, who kidnaps five powerful aliens from the Andromeda Galaxy to absorb their powers and reach the "Ultimate Prize". Fame Ben's identity is revealed to the world. Duped

Ben uses the Ultimatrix to split into three to handle multiple responsibilities. The Andromeda 5

Ben meets the five refugees (Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad) and fails to stop Aggregor from capturing them. The Map of Infinity

Ben and the team race Aggregor across the cosmos to secure pieces of a map leading to the Forge of Creation. Absolute Power Ben 10: Ultimate Alien — Complete Series Overview

Kevin absorbs the Ultimatrix's energy to stop Aggregor, but goes insane, forcing Ben and Gwen to find a way to save him. Season 2 & 3: The Dagon and Forever Knights War

The latter half of the series (often grouped into seasons 2 and 3) shifts focus to the Forever Knights and an ancient, interdimensional entity known as . Ben 10,000 Returns

: Ben meets his future self, who helps him unlock even more powerful transformations.

: The Forever Knights begin a crusade to rid the Earth of all alien life.

The Flame Keepers' Circle: A mysterious cult worships Dagon, who they believe will bring a new age to Earth; they are revealed to be led by Vilgax. The Ultimate Sacrifice

: The sentient "Ultimate" forms inside the Ultimatrix rebel, forcing Ben to face them in a psychic showdown.

The Ultimate Enemy (Parts 1 & 2): The series finale where Vilgax absorbs Dagon's power, and Ben must use the sword Ascalon to defeat him and decide the fate of the universe. Ben 10: Ultimate Alien Episodes

Ben 10: Ultimate Alien consists of 52 episodes aired between 2010 and 2012. While production divided these into different blocks, they are most commonly grouped into three seasons. Season 1 (20 Episodes) This season focuses on the Aggregor Arc

, where the Osmosian villain kidnaps five aliens from the Andromeda Galaxy to steal their powers.

Ben 10: Ultimate Alien (TV Series 2010–2012) - Episode list

Ben 10: Ultimate Alien consists of 52 episodes (and one crossover special) originally aired between 2010 and 2012. Set one year after Alien Force, the series follows a 16-year-old Ben Tennyson whose secret identity has been revealed to the world while he masters the new Ultimatrix, which allows his alien forms to evolve into more powerful "Ultimate" versions. Series Overview

The series is typically categorized into three main production seasons, though broadcasting orders sometimes varied. Season 1: 20 episodes Season 2: 12 episodes Season 3: 20 episodes Major story arcs and highlights

Ben 10: Ultimate Alien – The Complete Episode Guide and Series Overview

Ben 10: Ultimate Alien serves as the third iteration of the beloved Cartoon Network franchise, continuing the journey of Ben Tennyson as he transitions from a secret hero into a global superstar. Running for 52 episodes across three seasons from 2010 to 2012, the series introduced the high-stakes concept of "Ultimate" evolutions through the new Ultimatrix. Series Overview and Core Plot

Set just weeks after the events of Alien Force, Ben is now 16 years old. His life changes forever when a young fan named Jimmy Jones reveals his secret identity to the world. Now a public figure, Ben must balance his newfound fame with the arrival of a dangerous new threat: Aggregor, an Osmosian who seeks to absorb the powers of five aliens from the Andromeda Galaxy. The series is defined by three major story arcs:

The Aggregor/Map of Infinity Arc: Ben races against Aggregor to prevent him from reaching the "Forge of Creation".

The Ultimate Kevin Arc: Following a desperate sacrifice to stop Aggregor, Kevin absorbs the Ultimatrix's power and loses his sanity, forcing Ben to make a grim choice.

The Dagon/Forever Knight Arc: The final season focuses on an ancient extra-dimensional demon called Dagon and the return of Vilgax. Episode Breakdown by Season Season 1: The Andromeda Saga

This season follows Ben's team—Gwen Tennyson and Kevin Levin—as they try to save five kidnapped aliens: Bivalvan, Galapagus, P'Andor, Andreas, and Ra'ad.

Here’s a complete review of Ben 10: Ultimate Alien (all episodes), covering its strengths, weaknesses, key arcs, and where it stands in the broader Ben 10 franchise.

Where to Watch Ben 10: Ultimate Alien All Episodes

As of 2026, all 52 episodes of Ben 10: Ultimate Alien are available on:

Max (formerly HBO Max) – Complete series streaming.
Hulu – With live TV or premium add-ons.
Amazon Prime Video – Purchase per episode or season.
DVD/Blu-ray – Complete series box sets are still in print.

Narrative Arc: Identity and Responsibility

The central theme of Ultimate Alien is celebrity and accountability. Unlike previous seasons where Ben operated in the shadows, he is now a public figure. The show explores how this fame affects his ego and his relationships.

The first arc, revolving around the villain Aggregor, is arguably the strongest. Aggregor is a terrifying antagonist—a Osmosian who hunts baby aliens to absorb their powers. This arc forces Ben, Gwen, and Kevin to deal with high-stakes cosmic threats that feel genuinely dangerous. The five-part finale ("Absolute Power") regarding Kevin’s instability is a highlight of the entire franchise, bringing emotional closure to the "Kevin 7" storyline from the original series.

The latter half of the season introduces the Forever Knights and the "Will Harangue" arc, which satirizes media manipulation. While slightly less cohesive than the Aggregor arc, it keeps the momentum going until the final confrontation with the power-hungry villain, Vilgax, and the emotion-manipulating Diagon.

Season 2 (2011–2012)

1. "The Forge of Creation" (Season 1, Ep 16)

Ben travels to a dimension where time doesn't exist to stop Aggregor. He also meets a 5-year-old Ben, which is both adorable and philosophical. This episode features the first true test of the Ultimatrix’s power.