| Episode # | Title | Original Airdate | | :--- | :--- | :--- | | 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 | February 25, 2011 | | 25 | Girl Trouble | March 4, 2011 | | 26 | Revenge of the Swarm | March 11, 2011 | | 27 | The Creature From Beyond | March 18, 2011 | | 28 | Basic Training | March 25, 2011 | | 29 | It's Not Easy Being Gwen | April 1, 2011 | | 30 | Ben 10,000 Returns | April 8, 2011 | | 31 | Moonstruck | April 15, 2011 | | 32 | Prisoner Number 775 is Missing | April 29, 2011 | | 33 | The Purge | September 16, 2011 | | 34 | Simian Says | September 23, 2011 | | 35 | Greetings from Techadon | September 30, 2011 | | 36 | The Flame Keepers' Circle | October 7, 2011 | | 37 | Double or Nothing | October 14, 2011 | | 38 | The Perfect Girlfriend | October 21, 2011 | | 39 | Ultimate Sacrifice | November 4, 2011 | | 40 | The Widening Gyre | November 18, 2011 | | 41 | The Mother of All Vreedles | December 2, 2011 | | 42 | A Knight to Remember | December 9, 2011 | | 43 | Solitary Alignment | December 16, 2011 | | 44 | Inspector 13 | January 13, 2012 | | 45 | The Enemy of My Frenemy | January 20, 2012 | | 46 | Couples Retreat | January 27, 2012 | | 47 | Clyde 5 | February 3, 2012 | | 48 | The Ultimate Enemy (Part 1) | February 10, 2012 | | 49 | The Ultimate Enemy (Part 2) | February 17, 2012 | | 50 | The Most Dangerous Game Show | February 24, 2012 | | 51 | The End of an Era | March 2, 2012 | | 52 | The Final Battle (Parts 1 & 2) | March 9, 2012 |
If you want a full episode-by-episode index (titles, air dates, synopses, and writers), I can generate a complete list organized by season. index of ben 10 ultimate alien
Ultimate Cannonbolt: Develops metallic spikes for increased defensive and offensive rolling. New Andromeda Aliens Water Hazard (Orishan): Shoots high-pressure water blasts. | Episode # | Title | Original Airdate
: The hunt for the Map of Infinity, culminating in Kevin absorbing the Ultimatrix's power to stop Aggregor, which turns him into . Season 2: The Galactic & Personal Arcs : The hunt for the Map of Infinity,
For a full list of episodes and detailed plot summaries, you can visit the Ben 10 Wiki or official archives on or a list of where to watch the series?