Ben 10: Ultimate Alien All Episodes [upd] May 2026

The first season focuses on Ben, Gwen, and Kevin trying to stop Aggregor from capturing the Andromeda Five aliens.

The emotional climax is Kevin absorbing the Ultimatrix and becoming an insane, power-hungry mutant. Ben is forced to make a heartbreaking decision about whether to kill his best friend. Season 2 (2011) – The Dagon Arc Episode Count: 12 ben 10: ultimate alien all episodes

Some episode countings merge the final 4 episodes into the Season 3 run. Regardless, the true finale is "The Ultimate Enemy" (Episodes 47-48). Top 5 Essential Episodes You Cannot Skip If you don’t have time to watch Ben 10: Ultimate Alien all episodes back-to-back, prioritize these five: 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. 2. "Absolute Power" (Season 1, Ep 19-20) The heaviest story in the franchise. Kevin has become a monster. Ben tries to kill him. Grandpa Max orders Ben to stop. This two-parter asks whether heroes are allowed to be executioners. It remains controversial among fans. 3. "Ben 10,000 Returns" (Season 2, Ep 30) Future Ben (from the original series) comes back and immediately points out how flawed the Ultimatrix is. He fights Ultimate Albedo. The episode connects the entire original timeline and hints at Omniverse . 4. "Night of the Living Nightmare" (Season 3, Ep 44) A bottle episode. Ben is trapped in a nightmare loop where every decision leads to his friends dying. It is psychological horror for a kids' show and a masterclass in low-budget tension. 5. "The Ultimate Enemy" (Season 3, Ep 47-48) The series finale. Vilgax absorbs Dagon and becomes omnipotent. Ben wields the sword Ascalon. The ending sees Ben sacrifice the Ultimatrix to literally "reset" the universe’s power balance. It directly leads into Ben 10: Omniverse . How to Watch Ben 10: Ultimate Alien in Chronological Order Unlike Alien Force (which had some timeline confusion), Ultimate Alien is straightforward. Watch the episodes in broadcast order (Season 1, then 2, then 3). The first season focuses on Ben, Gwen, and

8.5/10 – An essential watch for any Ben 10 completionist. Do you agree with our list? Did we miss your favorite Ultimate alien transformation? Let us know in the comments below. And for more episode guides, check out our articles on "Ben 10: Original Series all episodes" and "Ben 10: Omniverse all episodes." Season 2 (2011) – The Dagon Arc Episode

| Ep # | Title | Key Ultimate Alien Debut | | :--- | :--- | :--- | | 1 | | Ultimate Swampfire | | 2 | Duped | N/A (Echo Echo clone chaos) | | 3 | Hit 'Em Where They Live | Ultimate Spidermonkey | | 4 | Video Games | Ultimate Big Chill | | 5 | Escape from Aggregor | Ultimate Cannonbolt | | 6 | Too Hot to Handle | N/A | | 7 | Andreas' Fault | N/A | | 8 | Fused | N/A | | 9 | Hero Time | N/A (Ben meets a fake superhero) | | 10 | Ultimate Aggregor | Ultimate Aggregor (Villain) | | 11 | Map of Infinity | Ultimate Echo Echo | | 12 | Reflected Glory | N/A | | 13 | Deep | N/A | | 14 | Where the Magic Happens | N/A (Charmcaster episode) | | 15 | Perplexahedron | N/A | | 16 | The Forge of Creation | Ultimate Humungousaur (major role) | | 17 | ...Nor Iron Bars a Cage | N/A (Vilgax returns) | | 18 | The Enemy of My Enemy | N/A | | 19 | Absolute Power (Part 1) | Ultimate Kevin (debut) | | 20 | Absolute Power (Part 2) | Ultimate Way Big |