Ben 10: Ultimate Alien All Episodes «Bonus Inside»

| 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 |

Tall, metallic armor; uses throwable sonic discs instead of organic clones.

: Ben meets his 10-year-old self in a time-travel crossover.

– Professor Paradox warns the team that Aggregor is seeking the four pieces of the Map of Infinity, which grants access to a dimension of ultimate power. The race begins in a deadly, booby-trapped temple. ben 10: ultimate alien all episodes

– Kevin begins hunting down old enemies and allies to absorb more energy. Ben decides that killing Kevin might be the only option, sparking a fierce rift with Gwen.

– Ben, Gwen, and Kevin travel to Pisces, a water planet, to prevent Aggregor from stealing the second piece of the Map.

– Grandpa Max shares the nostalgic story of how he first met Verdona, his Anodite wife, during his early years in the military. | Episode | Title | Original Airdate (US)

– Albedo, Ben's Galvan rival, returns to Earth. Instead of attacking, he starts a live stage show featuring alien actors to raise money to build a machine to fix his human DNA.

– Aggregor uses the complete map to enter the birthplace of Celestialsapiens (Alien X). A young, 10-year-old Ben from the past is accidentally dragged into the future to help save reality.

– While dealing with an arrogant celebrity lifestyle, Ben encounters a rampaging spaceship controlled by Galapagus, a peaceful turtle-like alien fleeing from Aggregor. The race begins in a deadly, booby-trapped temple

– Argit hides at the Plumber Academy to escape Kevin. Ben and Gwen try to protect Argit while attempting to reason with Kevin.

Ben 10: Ultimate Alien is often praised for its darker, more mature themes, particularly dealing with the corruption of power and the burden of responsibility. The arc where Kevin becomes a villain is considered one of the franchise's most emotional and well-written storylines. However, some fans felt that the sheer number of aliens and ultimate forms led to some underdeveloped transformations. A spin-off video game titled was also released alongside the series, allowing players to use the ultimate forms in a world-hopping adventure.

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– Prince Simian accidentally unleashes a Xenocyte outbreak on his home planet. He asks Ben for help, but Ben struggles to trust the slippery Arachnichimp.

The first season splits into two main narrative halves: the hunt for the Osmosian villain Aggregor and the tragic fallout of Kevin Levin’s mutation. The Aggregor Arc (Episodes 1–10)