List of Ben 10 : Ultimate Alien episodes - wikipedia List of Ben 10 : Ultimate Alien episodes This is a list of episodes of the American animated television series Ben 10 : Ultimate Alien, the third entry in Cartoon Network 's Ben 10 franchise created by team Man of Action ( a group consisting of Duncan Rouleau, Joe Casey, Joe Kelly, and Steven T. Seagle ), and produced by Cartoon Network Studios. It was followed in 2012 by Ben 10 : Omniverse. Contents 1 Series overview 2 Episodes 2.1 Season 1 ( 2010 ) 2.2 Season 2 ( 2011 ) 2.3 Season 3 ( 2011 -- 12 ) 2.4 Special ( 2011 ) 3 DVD releases 4 See also 5 Notes 6 References Series overview Season Episodes Originally aired First aired Last aired 20 April 23, 2010 ( 2010 - 04 - 23 ) December 10, 2010 ( 2010 - 12 - 10 ) 12 February 4, 2011 ( 2011 - 02 - 04 ) April 29, 2011 ( 2011 - 04 - 29 ) 20 September 16, 2011 ( 2011 - 09 - 16 ) March 31, 2012 ( 2012 - 03 - 31 ) Special November 25, 2011 ( 2011 - 11 - 25 ) Episodes Season 1 ( 2010 ) No. overall No. in season Title Directed by Written by Original air date Prod. code `` Fame '' Dan Riba Dwayne McDuffie April 23, 2010 ( 2010 - 04 - 23 ) 101 Ben 's secret identity is revealed to the entire world, and he is now a superhero loved everywhere by kids and teenagers, but distrusted by many adults. Kevin and Gwen find out who revealed Ben 's secret and where he lives, and the three go to `` pay him a visit ''. The informant turns out to be a young boy named Jimmy Jones, who has followed Ben 's exploits ever since he was ten - years old. With Jimmy 's help, Ben and company discover a series of alien attacks in Florida. The unknown alien steals a nuclear device from a prototype interstellar rocket. Omnitrix alien debuts : Wildmutt ( 10 - year - old ) Ultimatrix alien debuts : Swampfire, Brainstorm, Echo Echo, Jetray, Cannonbolt, Big Chill, Chromastone, Humungousaur, Goop, Spidermonkey, Rath, Ultimate Spidermonkey `` Duped '' Butch Lukic Len Uhley April 30, 2010 ( 2010 - 04 - 30 ) 102 The group runs into an army of Forever Knights ; in the confrontation Magister Labrid is killed when he saves Kevin 's life, and Kevin joins Ben and Gwen on their search for Max to repay his debt. Gwen is able to trace a leftover Laser Lance back to its original owners and they soon find a secret underground base, discovering an army of DNAliens. Sneaking in, the find that Max is n't there anymore, and on their way out encounter the Highbreed in charge of the ship. Ultimatrix alien debuts : Rath, Echo Echo, Big Chill, Murk Upchuck, Cannonbolt, Lodestar `` Hit ' Em Where They Live '' Matt Youngberg Len Wein May 7, 2010 ( 2010 - 05 - 07 ) 103 Zombozo then targets Ben 's mom again at Mr. Smoothy 's and attacks her there. He shocks Gwen ( who was trying to protect Sandra ) and gets her dizzy, and kidnaps Sandra. Ben, Gwen, and Kevin go to Zombozo 's hideout to save Ben 's mom. Ultimatrix alien debuts : Ultimate Big Chill `` Video Games '' Dan Riba Eugene Son May 14, 2010 ( 2010 - 05 - 14 ) 104 Harangue decides not to finish Ben off, as it would threaten his ratings, so he decides to fight Ben personally in Washington D.C. and challenges him to the fight on TV. Ben accepts and he, along with Gwen and Kevin, go to Washington D.C. The Stalker comes and turns on a monitor with Harangue 's face on it, and through it Harangue asks Ben if he has any last words. Ultimatrix alien debuts : Four Arms ( 16 - year - old ), Nanomech, Way Big 5 5 `` Escape From Aggregor '' Butch Lukic Charlotte Fullerton May 21, 2010 ( 2010 - 05 - 21 ) 105 The five aliens eventually decide to work together to free themselves from Aggregor. They free themselves and get their powers back. P'andor and Andreas decide to take over the ship, but Bivalvan, Ra'ad, and Galapagus decide to call the Plumbers for help. 6 6 `` Too Hot To Handle '' Matt Youngberg Marty Isenberg May 28, 2010 ( 2010 - 05 - 28 ) 106 A strange alien is offering big money ( over $1 million ) to someone who can open a safe ( which is really a containment suit ). That alien is revealed to be P'andor, who wants to be free of his suit. Surgeon, Buzz, and Hammer tried to break open the armor, but all fail miserably. After a while, Kevin, who heard about the challenge, tries to free P'andor by absorbing a Taydenite sample he kept in order to open the armor. He then changes his mind when his Plumber Badge detects a high level of radiation. Ultimatrix alien debuts : Ultimate Humungousaur, Water Hazard, Ultimate Cannonbolt 7 7 `` Andreas ' Fault '' Dan Riba Jim Krieg and Ernie Altbacker June 4, 2010 ( 2010 - 06 - 04 ) 107 If the castles Argit goes to refuse to let him rule their castles, he will use his new friend Andreas to destroy the castle. Andreas is also one of Aggregor 's victims. Jetray then scans Andreas ' DNA and gains a new form and transforms back into Ben. Argit gives Kevin money as payment for the money he owes him. Kevin then says that he loves money more than anything else in the world and Gwen gets mad at him for the remainder of the episode. Argit tells Andreas that Ben and his team are friends, but then a Forever Knight intelligence officer named Sir Dagonet comes in and turns Argit 's Forever Knight garrison against Ben and his friends. 8 8 `` Fused '' Butch Lukic Len Uhley June 11, 2010 ( 2010 - 06 - 11 ) 108 As Ben laments that things ca n't get worse, Aggregor shows up to recapture Ra'ad. The gang try to fight Aggregor, but he proves to be too strong for them. The Ultimatrix finally lets Ben transform, but unfortunately, all that he can transform into is an Amperi. With no choice, Ben transforms into AmpFibian and fights Aggregor. Ultimatrix alien debuts : AmpFibian 9 9 `` Hero Time '' Matt Youngberg Steven Barnes June 18, 2010 ( 2010 - 06 - 18 ) 109 He then kidnaps Julie, who was shown taking her anger over Jennifer out on the tennis courts. Nemesis then intercepts Jennifer 's helicopter. When Ben calls Julie, Nemesis answers the call and tells Ben to `` come and get me '' if he wants to see her again. Ultimatrix alien debuts : Armodrillo 10 10 `` Ultimate Aggregor '' Dan Riba Dwayne McDuffie October 10, 2010 ( 2010 - 10 - 10 ) 110 Aggregor then begins to absorb energy and Kevin tries to reason with him, explaining that regularly absorbing energy caused him to go insane when he was a kid but Aggregor does n't listen, claiming that it is a lie told by powerful Osmosians to control the weak Osmosians. Before Kevin can reason with him any further, Aggregor shoots Kevin with his spear. He then powers himself up and breaks the fabric of time. Ultimatrix alien debuts : Ultimate Swampfire 11 11 `` Map of Infinity '' Butch Lukic Dwayne McDuffie October 10, 2010 ( 2010 - 10 - 10 ) 111 Continued from the previous episode, Aggregor has absorbed the powers of Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad, transforming him into Ultimate Aggregor. Ben transforms into Humungousaur and attacks Aggregor in a fight of rage and anger, seemingly pummeling him unconscious. Ultimatrix alien debuts : Ultimate Echo Echo 12 12 `` Reflected Glory '' Matt Youngberg Peter David October 15, 2010 ( 2010 - 10 - 15 ) 112 The Forever Knights discuss their plan for the weapon and Ben and the team come in to fight with Cash, J.T., and Oliver filming the scene. Kevin gets angry with them not helping and Psyphon comes in to destroy Cash and J.T., believing them to be the masterminds behind Ben Tennyson. Ultimatrix alien debuts : Terraspin 13 13 `` Deep '' Dan Riba Marty Isenberg October 22, 2010 ( 2010 - 10 - 22 ) 113 Underwater on Piscciss, a Magister Plumber named Pyke is searching for something. He finds a swimming object, which happens to be Ultimate Aggregor, who seems to defeat Magister Pyke. 14 14 `` Where The Magic Hapens '' Butch Lukic Matt Wayne October 29, 2010 ( 2010 - 10 - 29 ) 114 The group is chasing Aggregor, who runs toward a door and shouts an incantation. The door glows symbols and opens to a world that looks like it is full of mana. Unfortunately, Four Arms was n't strong enough to keep the door open, and it closes. After Four Arms transforms back into normal, Ben remembers the glowing symbols and writes them down, but Gwen is unable to pronounce the symbols correctly. She does know someone who can read them, and that person is Charmcaster. 15 15 `` Perplexahedron '' Matt Youngberg Brian Swenlin November 5, 2010 ( 2010 - 11 - 05 ) 115 Azmuth contacts Ben on the Ultimatrix and is not happy with him for failing to stop Aggregor from claiming three of the four pieces to the Map of Infinity. When Ben tells Azmuth that scolding him is not going to help, Azmuth agrees and then teleports Ben, Gwen, and Kevin to the Rust Bucket 3 in another galaxy, in which they find the Perplexahedron, a giant cube - like artificial planet. Moments later, they spot Aggregor approaching the planet. Ultimatrix alien debuts : Ripjaws 16 16 `` The Forge of Creation '' Dan Riba Dwayne McDuffie November 12, 2010 ( 2010 - 11 - 12 ) 116 With Ultimate Aggregor having all four pieces of the Map of Infinity, he 'll be on his way to the Forge of Creation ( Alien X 's home planet ). Professor Paradox helps Ben, Gwen and Kevin get to they need to go, but after Paradox left, Ben and the others ran into Ben 's younger self. The four of them arrive at Alien X 's home planet, where they battle Ultimate Aggregor and after Kevin gone insane in absorbing Ben 's powers he defeated and absorbed Ultimate Aggregor. 10 - year - old Ben goes back to where he belong from Professor Paradox. Omnitrix alien debuts : Heatblast ( 10 - year - old ), Four Arms ( 10 - year - old ), Stinkfly Ultimatrix alien debuts : Alien X, NRG, Ultimate Kevin 17 17 ``... Nor Iron Bars a Cage '' Butch Lukic Len Wein November 19, 2010 ( 2010 - 11 - 19 ) 117 Ben and Gwen arrive in Incarceon to tell Morgg that Ultimate Kevin is going to kill him. Morgg ignores their warning and has his robots take them to a room to stay in until a supply ship picks them up. Meanwhile, while the prisoners are still mining, Ultimate Kevin flashes back to the last time he was a prisoner. He was still Kevin 11 and got so angry, that he threatened to hurt all the other prisoners while Quince and his friend, Kwarrel watched him. 18 18 `` The Enemy of My Enemy '' Matt Youngberg Len Uhley December 3, 2010 ( 2010 - 12 - 03 ) 118 While taking a ride in Ben 's car, Ben and Gwen discuss that Ultimate Kevin is still continuing his rampage on everyone that wronged him and that he needs to be taken care of. Just then, Ben accidentally runs over Argit, but he survives. Argit explains that he needs their help in order to hide from Ultimate Kevin. 19 19 `` Absolute Power, Part 1 '' Dan Riba Charlotte Fullerton December 10, 2010 ( 2010 - 12 - 10 ) 119 Kevin has been absorbing the powers of the Plumbers ' Helpers and Ben and Gwen had an argument whether they should kill or cure Kevin. Ben defeats Gwen and then battle the Forever Knights and Vulkanus to ask where are Kevin 's whereabouts but neither of them gave Ben any answers. Gwen finds Ben and tells him that their old enemy Michael Morningstar can help find and cure Kevin. 20 20 `` Absolute Power, Part 2 '' Butch Lukic Charlotte Fullerton December 10, 2010 ( 2010 - 12 - 10 ) 120 Halfway to the end of the episode, Kevin is still rampaging. Ben and Gwen use Michael Morningstar, Julie, Ship and Cooper to help cure Kevin. Ben defeated Kevin and in Los Soledad Cooper use the power of the Entropy Pump to turn Kevin back to human and the powers of the Andromeda aliens and the Plumbers ' Helpers return. Season 2 ( 2011 ) No. overall No. in season Title Directed by Written by Original air date Prod. code 21 `` The Transmogrification of Eunice '' Matt Youngberg Eugene Son February 4, 2011 ( 2011 - 02 - 04 ) 201 Ben, Gwen, and Kevin go out into the wilderness for a camping trip. During a car race between Ben and Kevin, a strange pod falls from space. While trying to open the pod, Gwen cuts her hand on it. The pod then opens to reveal a beautiful, dark green - eyed, blonde - haired girl. Gwen gives the girl some of her spare clothes and the girl reveals her name to be Eunice, though she does n't remember anything else. As the camping trip continues, Eunice is revealed to have a strange connection to nature and Ben begins to develop romantic feelings for Eunice. Sunder then arrives on Earth on a mission to find Eunice. 22 `` Eye of the Beholder '' Dan Riba Len Uhley February 11, 2011 ( 2011 - 02 - 11 ) 202 Baz - El is on a distant planet where he is stealing some valuable gems from some temple statues. Later, the temple guardian worshippers attack Baz - El. Ship suddenly hears Baz - El 's cries for help, and leaves Julie to help his old owner. Julie ask Ben for help to locate Ship, who left to help Baz - El. However, their break - up makes things difficult, but Gwen and Kevin agree to help Julie. 23 `` Viktor : The Spoils '' Butch Lukic Kevin Grevioux February 18, 2011 ( 2011 - 02 - 18 ) 203 Zarcovia 's soldiers has found the frozen body of Dr. Viktor. Prince Gyula and King Xarion want to see this weapon. Gyula wants to control Dr. Viktor to use him against rebels in their civil war, but Xarion tells him not to. King Xarion asks for help from Ben, Gwen, and Kevin and explains what Gyula is trying to accomplish. When they find Dr. Viktor 's corpse, they are found by Gyula 's soldiers. While fighting them, Dr. Viktor 's ice block begins to melt and he breaks free ; Gyula reveals that Dr. Viktor is under his control. Ultimatrix alien debuts : Wildmutt ( 16 - year - old ), Heatblast ( 16 - year - old ) 24 `` The Big Story '' Matt Youngberg Ernie Altbacker and Jim Krieg March 4, 2011 ( 2011 - 03 - 04 ) 204 Jimmy Jones sees a meteor falling in a cave, where an alien plant attacks him. He tells Ben and his team about it, but only Ben believes him. They go in the cave but the plant is n't there. The next day, Jimmy sees Ben going into the cave and talking to the plant. He takes a photo of that, but the photo is n't good, so Gwen does n't believe him. Later, Jimmy goes to the supermarket and Ben, as Humongousaur, attacks him. Jimmy takes his bicycle and runs, but Ben becomes Cannonbolt and hunts him down. Jimmy goes to Gwen and Kevin and they all go to the cave. In the entrance of the cave they catch Jimmy and they take him to the plant. Jimmy finds that Gwen, Kevin, and Ben are clones made by the plant. 25 5 `` Girl Trouble '' Dan Riba Eugene Son March 11, 2011 ( 2011 - 03 - 11 ) 205 The team goes to Gwen 's house to find a solution to defeat Computron 's minions from Dimension 12. When they go to Gwen 's room, they find a dark - hair girl, who is Sunny, Gwen 's naughty cousin. Gwen 's mom insists they take Sunny with them. The team takes Sunny to the mission but they left her in Kevin 's car. They go to fight the robots but Sunny follows them. She destroys the robots with ease and is very happy, but the team is looking at her strangely. Gwen tells her mother that Sunny is an Anodite, much to her surprise and disgust. 26 6 `` Revenge of the Swarm '' Butch Lukic Stan Berkowitz March 18, 2011 ( 2011 - 03 - 18 ) 206 One year after the events of Ben 10 : Alien Swarm, Victor Validus attacks Ben at night but when he defends himself, he finds a Nanochip that was believed to have been destroyed along with its Queen. Ben, Kevin and Gwen find Victor 's daughter, Elena, to see what is going on. 27 7 `` The Creature from Beyond '' Dan Riba Len Uhley March 25, 2011 ( 2011 - 03 - 25 ) 207 An evil creature known as Lucubra released from another dimension has plans to enslave the human race for its master. 28 8 `` Basic Training '' Butch Lukic Adam Beechen April 1, 2011 ( 2011 - 04 - 01 ) 208 Ben, Gwen, and Kevin are summoned to Plumbers Academy to go under training. They create a good friendship with an alien named Tack and Ben dislikes the drill instructor, Magister Hulca, that is being targeted for revenge by a menacing Tetramand. Ultimatrix alien debuts : Fasttrack, Diamondhead 29 9 `` It 's Not Easy Being Gwen '' Matt Youngberg Matt Wayne April 8, 2011 ( 2011 - 04 - 08 ) 209 Gwen must juggle things around, in which she has to help Ben and Kevin recapture Dr. Animo, fill out invitations for her mother Natalie 's family reunion, help Kevin get into school, finish exams, and go to her best friend Emily 's piano performance. All in one day. 30 10 `` Ben 10,000 Returns '' Matt Youngberg Dwayne McDuffie April 15, 2011 ( 2011 - 04 - 15 ) 210 Following a visit from Paradox after a fight with Eon, Ben 10,000 from an alternate future arrives twenty years from the future to seek the aid of his sixteen - year - old past counterpart in tracking down Eon. It is revealed that Eon is actually an adult Ben from an alternate world, and that he wants to destroy all of the other Bens to become the one and only Ben Tennyson. Ultimatrix alien debuts : Ultimate Ben, Arctiguana, Clockwork, XLR8 31 11 `` Moonstruck '' Butch Lukic Len Uhley April 22, 2011 ( 2011 - 04 - 22 ) 211 In flashbacks, Max tells the astounding story to Kevin, Gwen, and Ben of how he had met and fallen head - over-heels for Verdona when he was but seventeen years old in the 1940s. 32 12 `` Prisoner Number 775 Is Missing '' Dan Riba Peter David April 29, 2011 ( 2011 - 04 - 29 ) 212 The secrets of Area 51 are revealed to Ben Tennyson by Colonel Rozum after Old George infiltrates and destroys it, setting free the 775th prisoner. Ultimatrix alien debuts : Ultimate Wildmutt, ChamAlien Season 3 ( 2011 -- 12 ) No. overall No. in season Title Directed by Written by Original air date Prod. code 33 `` The Purge '' Butch Lukic David McDermott September 16, 2011 ( 2011 - 09 - 16 ) 301 Old George brings the Forever Knights in one group in order to vanquish every alien being on Earth. 34 `` Simian Says '' Matt Youngberg Charlotte Fullerton September 23, 2011 ( 2011 - 09 - 23 ) 302 Simian accidentally unleashes a Xenocyte Queen which orchestrates an invasion of the Arachnichimps ' planet. When Eunice goes missing, Ben, Gwen, and Kevin end up helping Simian liberate the Arachnichimps ' planet from a DNAlien version of the Arachnichimp Mizaru. 35 `` Greetings from Techadon '' Dan Riba Charlotte Fullerton September 30, 2011 ( 2011 - 09 - 30 ) 305 Techadon robots go after Ben on orders from Vulkanus to attain the Ultimatrix. Gwen and Kevin go across space to prevent Vulkanus from getting what he is after. 36 `` The Flame Keepers ' Circle '' Dan Riba Brian Swenlin October 7, 2011 ( 2011 - 10 - 07 ) 304 Julie joins a cult called the Flame Keepers ' Circle. Unfortunately for her, Ben discovers that the Flame Keepers ' Circle worships Vilgax ; whom they mistake for the mighty Diagon because of his close squid - like resemblance. 37 5 `` Double or Nothing '' Matt Youngberg Len Uhley October 14, 2011 ( 2011 - 10 - 14 ) 305 Albedo profits from Ben 's fame and creates a play about him with the help of three alien actors based on the aliens in Ben 's Ultimatrix. 38 6 `` The Perfect Girlfriend '' Dan Riba Stan Berkowitz October 21, 2011 ( 2011 - 10 - 21 ) 306 Elena and the nanochips return and impersonate Julie while the real Julie is at a tennis tournament overseas. Ben does not catch onto this until the very end when the real Julie returns and causes Elena to realize that she had never really loved and cared about the real Ben in the first place. Now knowing what true hatred is, Elena disappears with a promise to return. 39 7 `` The Ultimate Sacrifice '' Butch Lukic Dwayne McDuffie and J.M. DeMatteis October 28, 2011 ( 2011 - 10 - 28 ) 307 The ultimate aliens inside Ben 's Ultimatrix demand their freedom and end up sucking Ben into the Ultimatrix. While Gwen assumes her innermost Anodite form as her astral projection to enter the Ultimatrix to help Ben, Kevin travels to planet Galvan Prime to convince Azmuth to help. Ultimatrix alien debuts : Ghostfreak ( Ultimate Alien debut ) 40 8 `` The Widening Gyre '' Matt Youngberg Eugene Son November 4, 2011 ( 2011 - 11 - 04 ) 308 The gang look into the Pacific Garbage Vortex when some people have gone missing. When they arrive, they find the missing people and two agents sent by Colonel Rozum while dealing with giant seagulls and a sentient Trash Monster. 41 9 `` The Mother of All Vreedles '' Dan Riba Matt Wayne November 18, 2011 ( 2011 - 11 - 18 ) 309 Ma Vreedle plans to spawn an army of Pretty Boy Vreedle clones, which could dry up Earth 's oceans. 42 10 `` A Knight to Remember '' Butch Lukic Len Uhley and Matt Wayne December 2, 2011 ( 2011 - 12 - 02 ) 310 Vilgax and the Flame Keepers ' Circle fight against George and the Forever Knights along with Ben. Vilgax gets Diagon 's heart and ends up being sucked into Diagon 's own parallel dimension. Ultimatrix alien debuts : Eatle 43 11 `` Solitary Alignment '' Matt Youngberg Peter David December 9, 2011 ( 2011 - 12 - 09 ) 311 Azmuth reveals in his memories how Old George had acquired the great sword, Ascalon, and how he sealed Diagon the first time millennia ago. In addition, he reveals the real reasons for creating the great and powerful Omnitrix and Ultimatrix. 44 12 `` Inspector 13 '' Butch Lukic Geoffrey Thorne February 4, 2012 ( 2012 - 02 - 04 ) 312 Techadon Weapon Master 13 arrives on Earth and demands to have the Ultimatrix. A malfunction grants Gwen and Kevin the forms and unique abilities of some of Ben 's aliens. Ultimatrix alien debuts : Clockwork ( official ) 45 13 `` The Enemy of My Frenemy '' Matt Youngberg David McDermott and Brian Swenlin February 11, 2012 ( 2012 - 02 - 11 ) 313 With the help of Hex, Gwen and the gang set out to rescue Charmcaster from her home world of Ledgerdomain. However, they are shocked to learn that Charmcaster 's intentions bold ill for them all. 46 14 `` Couples Retreat '' Dan Riba Geoffrey Thorne February 18, 2012 ( 2012 - 02 - 18 ) 314 Darkstar romantically charms Charmcaster and uses her intensely strong magical strength and abilities to his own evil advantage to absorb all of the infinite amounts of mystical energies from Ledgerdomain itself. Meanwhile, Gwen and Kevin have a disagreement over the protection of one of her spellbooks. 47 15 `` Catch a Falling Star '' Butch Lukic Len Uhley February 25, 2012 ( 2012 - 02 - 25 ) 315 Jennifer Nocturne runs away with Captain Nemesis after freeing him from jail in hopes of creating a new life with him. Ben and Gwen pursue them, thinking Jennifer has been held against her will. 48 16 `` The Eggman Cometh '' Matt Youngberg Stan Berkowitz March 3, 2012 ( 2012 - 03 - 03 ) 316 Dr. Animo returns with a plot to transform eggs into pterodactyls. Ultimatrix alien debuts : Jury Rigg 49 17 `` Night of the Living Nightmare '' Dan Riba Don McGregor March 10, 2012 ( 2012 - 03 - 10 ) 317 Albedo returns and infects Ben with a Cassiopeian Dream Eater, trapping him into a dream world where he kept being attacked by several of his enemies. 50 18 `` The Beginning of the End '' Butch Lukic Dan Riba March 17, 2012 ( 2012 - 03 - 17 ) 318 The Forever Knights battle Diagon 's Esoterica minions and Ben 's plan to help the knights fails as they are, too, intent on fighting him to listen to reason. 51 19 `` The Ultimate Enemy : Part 1 '' Matt Youngberg Matt Wayne March 24, 2012 ( 2012 - 03 - 24 ) 319 Ben, Gwen, Kevin, and George try to stop Diagon 's resurrection, but first, they must defeat the demon 's herald : Vilgax, now merged with a Lucubra and is much stronger than ever. To make matters worse, Dagon releases a wave that transforms everyone on the planet into an Esoterica, save Ben, Gwen, Kevin, George, Julie, and Ship. 52 20 `` The Ultimate Enemy : Part 2 '' Dan Riba Dwayne McDuffie March 31, 2012 ( 2012 - 03 - 31 ) 320 Ben fails to defeat the extradimensional Diagon, who proceeds to destroy Sir George by electrocuting him with dark lightning. Vilgax returns, capturing Diagon by Psyphon 's power - absorbing machine. Psyphon proceeds to transfer Diagon 's power to Vilgax, making the galactic conqueror into a nearly - unstoppable force. Ben wields George 's sword, Ascalon, and uses it to drain Diagon 's power from Vilgax. Reverted to his original form, Vilgax tries to corrupt Ben, asking what he plans to do with the combined power of Ascalon, Diagon, and the Ultimatrix but Gwen and Kevin both encourage Ben to resist Vilgax 's temptation. Ben uses his infinite godly abilities to transform the Esoterica back into humans. Azmuth appears before them and asks Ben to return Ascalon and the Ultimatrix to him. He gives Ben a new version of the Omnitrix. Ultimatrix alien debuts : Ultimate Way Big Special ( 2011 ) Title Directed by Written by Original air date `` Ben 10 / Generator Rex : Heroes United '' Chris Graham and Kenji Ojo Man of Action November 25, 2011 ( 2011 - 11 - 25 ) Ben teams up with an alternate superhero, Rex Salazar, to save the Earth from a deadly Alpha Nanite that entered New York through a swirling vortex, the same way Ben arrived in the city. Ultimatrix alien debuts : XLR8 ( official ), Shocksquatch, Upgrade DVD releases Volume Season Aspect ratio Episodes Time length Release date 1. Ben 10 : Ultimate Alien -- Escape From Aggregor 16 : 9 10 ( Episodes 1 -- 10 ) 223 minutes January 11, 2011 December 1, 2010 2. Ben 10 : Ultimate Alien -- Power Struggle 16 : 9 10 ( Episodes 11 -- 20 ) 230 minutes May 3, 2011 April 5, 2011 3. Ben 10 : Ultimate Alien -- The Return of Heatblast 16 : 9 10 ( Episodes 21 -- 30 ) 230 minutes August 2, 2011 September 11, 2011 4. Ben 10 : Ultimate Alien -- The Wild Truth 2, 3 16 : 9 12 ( Episodes 31 -- 42 ) 276 minutes December 6, 2011 November 30, 2011 5. Ben 10 : Ultimate Alien -- The Ultimate Ending 16 : 9 10 ( Episodes 43 -- 52 ) 220 minutes April 17, 2012 March 21, 2012 See also List of Ben 10 episodes List of Ben 10 : Alien Force episodes List of Ben 10 : Omniverse episodes List of Ben 10 ( 2016 TV series ) episodes Notes Jump up ^ This episode was storied by Charlotte Fullerton and teleplay by Eugene Son. Jump up ^ This episode is dedicated to Dwayne McDuffie, who died in February 21, 2011. Jump up ^ This crossover special is a one - hour episode of Generator Rex. References ^ Jump up to : `` Ben 10 Ultimate Alien Volume 1 DVD ''. Amazon.com. Retrieved 2011 - 11 - 04. ^ Jump up to : `` Ben 10 Ultimate Alien : Power Struggle DVD ''. Amazon.com. Retrieved 2011 - 11 - 04. ^ Jump up to : `` Ben 10 : Ultimate Alien -- Volume 3 : The Return of Heatblast DVD Information ''. TVShowsOnDVD.com. 2011 - 02 - 08. Retrieved 2011 - 11 - 04. ^ Jump up to : `` Ben 10 Ultimate Alien : The Return of Heatblast : Amazon.ca : DVD ''. Amazon.ca. Retrieved 2011 - 11 - 04. ^ Jump up to : David McCutcheon. `` Ben 10 's Wild Truth Exposed on DVD ''. Uk.dvd.ign.com. Retrieved 2011 - 11 - 04. ^ Jump up to : `` Ben 10 : Ultimate Alien -- Announcement for ' Volume 5 : The Ultimate Ending ' on DVD ''. Retrieved 2011 - 12 - 21. Ben 10 Series Original series episodes Alien Force episodes Ultimate Alien episodes Omniverse episodes Reboot episodes Films and specials Secret of the Omnitrix Race Against Time Destroy All Aliens Alien Swarm Heroes United Characters Characters aliens villains Games Protector of Earth Alien Force FusionFall Vilgax Attacks The Rise of Hex Cosmic Destruction Punch Time Explosion and XL Galactic Racing Omniverse Omniverse 2 Toys Ben 10 Lego Game shows Ultimate Challenge See also Generator Rex The Secret Saturdays Batman : The Brave and the Bold Retrieved from `` https://en.wikipedia.org/w/index.php?title=List_of_Ben_10:_Ultimate_Alien_episodes&oldid=825953050 '' Categories : Ben 10 Lists of American children 's animated television series episodes Cartoon Network - related lists 2010s - related lists Talk Contents About Wikipedia Български Čeština Français Bahasa Indonesia Italiano Nederlands Português Suomi ไทย Türkçe 4 more Edit links This page was last edited on 16 February 2018, at 10 : 17. 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Question: ben 10 ultimate alien season 2 last episode
Answer: Prisoner Number 775 Is Missing