Ben 10: Ultimate Alien Episodes

Original Series

Alien Force

Ultimate Alien

Omniverse

Reboot

General	Episodes

The following is a list of episodes for Ben 10: Ultimate Alien. There are a total of 52 episodes and 2 crossover specials. Although the first 20 episodes were produced and aired as one season, they were written as two seasons of 10 episodes each. Furthermore, Season 3 was split into Seasons 2 and 3 when aired. Several episodes in this season aired out of order.

This article is about the Ultimate Alien episodes in production order. You might have been looking for the U.S. Airing Order.

Season 1

Season 2

Season 3

Crossovers

Season 1: 2010 (Episodes 1 - 10)

Image	Title	Number	Overall	Original Airdate
	Fame	1	99	April 23, 2010
	Ben's secret identity is exposed, casting him into the spotlight. Elsewhere, an alien plans to detonate a nuclear bomb.
	Duped	2	100	April 30, 2010
	Ben uses Echo Echo to make two clones of himself to attempt to be in three places at once.
	Hit 'Em Where They Live	3	101	May 7, 2010
	Zombozo, Charmcaster, and Vulkanus form an alliance and plan to ambush Ben's parents.
	Video Games	4	102	May 14, 2010
	Will Harangue comes up with a mastermind plan to put an end to Ben, the 'menace'.
	Escape from Aggregor	5	103	May 21, 2010
	The real story behind Aggregor and his escaped prisoners is revealed.
	Too Hot to Handle	6	104	May 28, 2010
	After Kevin accidentally releases Aggregor's third prisoner from a suit that protects others from his radiation, the gang has to stop him from radiating the Earth!
	Andreas' Fault	7	105	June 4, 2010
	The gang encounter Argit, who has teamed up with the Forever Knights and Aggregor's fourth prisoner.
	Fused	8	106	June 11, 2010
	Ben accidentally gets fused with Aggregor's fifth prisoner who has no plans of getting out of his body!
	Hero Time	9	107	June 18, 2010
	Ben's childhood hero makes a comeback while he's on a date with a beautiful, young movie actress.
	Ultimate Aggregor	10	108	October 10, 2010
	Aggregor, having recaptured the five aliens, puts his ultimate plan into action.

Season 2: 2010 (Episodes 11 - 20)

Image	Title	Number	Overall	Original Airdate
	Map of Infinity	11	109	October 10, 2010
	Ben must stop the newly transformed and extremely dangerous Aggregor from attaining the first piece of the Map of Infinity.
	Reflected Glory	12	110	October 15, 2010
	Cash and J.T. take credit for Ben's successes, so Psyphon comes back thinking J.T. and Cash were responsible for Vilgax's defeat!
	Deep	13	111	October 22, 2010
	Ben and the gang travel to a water planet in order to stop Aggregor from obtaining the second piece of the Map of Infinity.
	Where the Magic Happens	14	112	October 29, 2010
	Gwen is forced to team up with her nemesis, Charmcaster, when the team finds themselves to have to stop Aggregor!
	Perplexahedron	15	113	November 5, 2010
	With the fourth piece of the Map of Infinity almost in Aggregor's clutches, the gang chase him through the artificial planetoid known as the Perplexahedron.
	The Forge of Creation	16	114	November 12, 2010
	When Aggregor goes after the limitless power of Alien X, the gang are forced to do whatever it takes...
	...Nor Iron Bars a Cage	17	115	November 19, 2010
	Old feelings resurface when Kevin returns to the Null Void that housed him for years.
	The Enemy of My Enemy	18	116	December 3, 2010
	Argit asks for protection from Ben and Gwen after Kevin decides to finish him off.
	Absolute Power: Part 1	19	117	December 10, 2010
	When Ben and Gwen are faced with an unexpected enemy, Gwen turns to Darkstar for help.
	Absolute Power: Part 2	20	118	December 10, 2010
	Gwen and Ben have to do whatever it takes to bring down the "mad dog" Kevin.

Season 3: 2011 - 2012 (Episodes 21 - 52)

Image	Title	Number	Overall	Original Airdate
	The Transmogrification of Eunice	21	119	February 4, 2011
	The gang meet a new girl called Eunice and everything is going well... until Sunder shows up for her.
	Eye of the Beholder	22	120	February 11, 2011
	When Baz-El gets captured, it's up to Ben and the others to rescue him.
	The Big Story	23	121	March 4, 2011
	While looking for a story to put on his site, Jimmy sees a strange meteorite fall to Earth.
	Viktor: The Spoils	24	122	February 18, 2011
	The team are called in to investigate a dispute in the small country of Zarkovia. Once there, they discover an old enemy is about to be unleashed.
	Girl Trouble	25	123	March 11, 2011
	Gwen is infuriated by the prospect of her cousin paying the team a visit, and it only gets worse when it is uncovered that her cousin is not entirely human...
	Revenge of the Swarm	26	124	March 18, 2011
	The gang face the swarm again, but this time with a new, more powerful queen.
	Ben 10,000 Returns	27	125	April 15, 2011
	Ben 10,000 returns to help Ben battle a new, dangerous threat.
	The Creature from Beyond	28	126	March 25, 2011
	An evil creature released from another dimension has plans to enslave the human race for its master.
	Basic Training	29	127	April 1, 2011
	Ben, Gwen, and Kevin are forced to go through basic training at the Plumbers' Academy.
	It's Not Easy Being Gwen	30	128	April 8, 2011
	A day in the hectic life of Gwen Tennyson.
	Prisoner Number 775 Is Missing	31	129	April 29, 2011
	The team takes a look at the real purpose of Area 51 and have to recapture an escaped alien prisoner.
	Moonstruck	32	130	April 22, 2011
	Max tells the kids about his first encounter with aliens and the story of how he and Verdona met and fell in love.
	Simian Says	33	131	September 23, 2011
	A Xenocyte Queen takes over the Arachnichimps' home planet.
	Greetings from Techadon	34	132	September 30, 2011
	Ben finds himself in an inescapable situation when Techadons, custom-made to destroy him, start coming after him.
	The Purge	35	133	September 16, 2011
	Old George brings the Forever Knights in one group in order to vanquish every alien being on Earth.
	The Flame Keepers' Circle	36	134	October 7, 2011
	Julie joins a fanatical group who, unbeknownst to her, have discovered Vilgax and worship him.
	Double or Nothing	37	135	October 14, 2011
	Albedo resurfaces, and he's making money off of Ben's fame.
	The Perfect Girlfriend	38	136	October 21, 2011
	The nanochips are back, and have disguised themselves as Julie.
	The Ultimate Sacrifice	39	137	October 28, 2011
	The six Ultimate Forms demand their freedom from the Ultimatrix.
	The Mother of All Vreedles	40	138	November 18, 2011
	Ma Vreedle plans to create a clone army of her newest spawn, using all of Earth's saltwater as a key ingredient in the cloning process.
	The Widening Gyre	41	139	November 4, 2011
	The team battles a new, dangerous threat in the Pacific Ocean.
	A Knight to Remember	42	140	December 2, 2011
	Vilgax and the Flame Keepers' Circle duel George and the Forever Knights, who oppose their goals of reviving Dagon.
	Solitary Alignment	43	141	December 9, 2011
	Azmuth reveals how Sir George got his sword and slayed Dagon, and the team decides to make a deal with the First Knight.
	Inspector 13	44	142	February 4, 2012
	A mysterious weapon master from Techadon visits Earth and wants the Ultimatrix to enhance his creations.
	Enemy of My Frenemy	45	143	February 11, 2012
	Ben, Gwen, and Kevin set out to rescue Charmcaster from Ledgerdomain, but, unbeknownst to them, Charmcaster has plans of her own.
	Catch a Falling Star	46	144	February 25, 2012
	Movie star Jennifer Nocturne, who is not in her right mind, teams up with the evil Captain Nemesis.
	The Eggman Cometh	47	145	March 3, 2012
	Dr. Animo returns with an army of dragon-like mutants, while Ben has his own problems with his new transformation, Juryrigg.
	Couples Retreat	48	146	February 18, 2012
	Darkstar finds his way into Ledgerdomain, where he seduces Charmcaster, using her energies in his latest attempt to destroy Ben, Gwen, and Kevin.
	Night of the Living Nightmare	49	147	March 10, 2012
	Albedo tries to reclaim the Ultimatrix from Ben by transporting him into one of his own worst nightmares.
	The Beginning of the End	50	148	March 17, 2012
	The Flame Keepers' Circle try to release Dagon from his dimension, but Vilgax is released instead.
	The Ultimate Enemy: Part 1	51	149	March 24, 2012
	Dagon breaks out of the seal and turns all humans into Flame Keepers' Circle soldiers.
	The Ultimate Enemy: Part 2	52	150	March 31, 2012
	Vilgax betrays Dagon so that he can absorb all of his power to destroy his one true enemy: Ben Tennyson.

Crossovers

Image	Title	Original Airdate
	Ben 10/Generator Rex: Heroes United	November 25, 2011
	After arriving in Rex's world, Ben Tennyson has no other choice than to team up with Providence's secret weapon in order to defeat a new, very dangerous threat.
	Alien X-Tinction	April 11, 2021
	The Tennysons are attacked by a villainous dimension-hopping Omni-alien, known only as Alien X. With help from a parallel universe version of Max, they bring multiple Bens and Gwens together to form an alien hero army and combat this threat.