Ben 10: Ultimate Alien marks a high-stakes era for the franchise, transitioning from the secrecy of Alien Force to a world where Ben Tennyson is a global celebrity. Over its , the series explores the power of the Ultimatrix , a device that allows Ben to "evolve" his aliens into more powerful forms. The Aggregor & Map of Infinity Arc (Episodes 1–20) The first 20 episodes focus on the Osmosian villain
, who kidnaps five powerful aliens from the Andromeda Galaxy to absorb their powers. Ben 10: Ultimate Alien (season 1) - Wikiquote ben 10: ultimate alien all episodes
: The two-part series finale where the Dagon/Vilgax threat is resolved. Ben 10: Ultimate Alien marks a high-stakes era
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 Ben 10: Ultimate Alien (season 1) - Wikiquote
This season focuses on Ben's life after his secret identity is revealed to the world and his battle against the intergalactic criminal, Ben 10 Wiki
Whether you’re a first-time viewer or a nostalgic fan, deliver 52 half-hours of creative alien designs, genuine emotional stakes, and some of the best superhero action on Cartoon Network. From the desperation of “Absolute Power” to the cosmic scale of “The Final Battle,” this series proves why Ben Tennyson remains one of the most enduring heroes of the 21st century.
| Episode | Title | Original Airdate (US) | | :--- | :--- | :--- | | 21 | "The Transmogrification of Eunice" | February 4, 2011 | | 22 | "Eye of the Beholder" | February 11, 2011 | | 23 | "Viktor: The Spoils" | February 18, 2011 | | 24 | "The Big Story" | March 4, 2011 | | 25 | "Girl Trouble" | March 11, 2011 | | 26 | "Revenge of the Swarm" | April 1, 2011 | | 27 | "The Creature from Serenity" | April 8, 2011 | | 28 | "Prisoner Number 775 is Missing" | April 15, 2011 | | 29 | "The Purge" | April 29, 2011 | | 30 | "Simian Says" | May 6, 2011 | | 31 | "Greetings from Techadon" | May 13, 2011 | | 32 | "The Flame Keepers' Circle" | May 20, 2011 | | 33 | "Double or Nothing" | May 27, 2011 | | 34 | "The Perfect Girlfriend" | June 3, 2011 | | 35 | "The Ultimate Sacrifice" | September 16, 2011 | | 36 | "The Widening Gyre" | September 23, 2011 | | 37 | "The Mother of All Vreedles" | September 30, 2011 | | 38 | "A Knight to Remember" | October 7, 2011 | | 39 | "Solitary Alignment" | October 14, 2011 | | 40 | "Inspector 13" | October 21, 2011 | | 41 | "The Enemy of My Frenemy" | November 4, 2011 | | 42 | "Couples Retreat" | November 11, 2011 | | 43 | "Catch a Falling Star" | November 18, 2011 | | 44 | "The Eggman Cometh" | December 2, 2011 | | 45 | "Night of the Living Nightmare" | December 9, 2011 | | 46 | "The Beginning of the End" | February 25, 2012 | | 47 | "The Ultimate Enemy: Part 1" | March 3, 2012 | | 48 | "The Ultimate Enemy: Part 2" | March 3, 2012 | | 49 | "The Vengers" | March 10, 2012 | | 50 | "The Couple That Slays Together, Stays Together" | March 17, 2012 | | 51 | "The Frogs of War: Part 1" | March 24, 2012 | | 52 | "The Frogs of War: Part 2" | March 31, 2012 |