Ben 10: Ultimate Alien Episodes

The following is a list of episodes for Ben 10: Ultimate Alien. There are a total of 52 episodes and one crossover special.

This article is about the Ultimate Alien episodes in production order. You might have been looking for the intended order, or the U.S. airing order.

Season 1

Season 2

Crossovers

Season 1: 2010 (Episodes 1 - 20)

Image	Title	Number	Overall	Overall (franchise)	Original Airdate
	Fame	1	1	99	April 23, 2010
	Ben's secret identity is revealed to the world, and an alien refugee is about to detonate a nuclear bomb.
	Duped	2	2	100	April 30, 2010
	Under pressure from his newfound fame, Ben comes up with a plan to be at more than one place at a time.
	Hit 'Em Where They Live	3	3	101	May 7, 2010
	Now that Ben's secret identity is out in the open, his old enemies team up to attack his family.
	Video Games	4	4	102	May 14, 2010
	Ben's celebrity lands him a starring role in his own video game.
	Escape From Aggregor	5	5	103	May 21, 2010
	Five aliens from another galaxy attempt to escape from their mysterious captor.
	Too Hot to Handle	6	6	104	May 28, 2010
	A radioactive alien menace tricks Kevin into freeing him from his containment suit.
	Andreas' Fault	7	7	105	June 4, 2010
	The team discovers that alien con-man Argit has somehow become the leader of the Forever Knights.
	Fused	8	8	106	June 11, 2010
	Ben is trapped in the form of his newest transformation, a form Aggregor intends to destroy.
	Hero Time	9	9	107	June 18, 2010
	A starstruck Ben dates a beautiful young movie actress, while his childhood hero makes a comeback.
	Ultimate Aggregor	10	10	108	October 10, 2010
	Aggregor's ultimate plan is revealed, and it's already too late to stop him!
	Map of Infinity	11	11	109	October 10, 2010
	Ben and his team travel to a bizarre half-frozen, half molten planet to prevent Aggregor from obtaining a priceless map.
	Reflected Glory	12	12	110	October 15, 2010
	JT and Cash get in over their heads when they take credit for Ben's heroic acts.
	Deep	13	13	111	October 22, 2010
	Ben, Kevin, and Gwen journey to the center of an all-water planet in an attempt to finally capture Aggregor.
	Where the Magic Happens	14	14	112	October 29, 2010
	Gwen takes the team to a dimension of magic, where their only hope of survival rests with her old foe Charmcaster.
	Perplexahedron	15	15	113	November 5, 2010
	Ben, Kevin and Gwen race Aggregor through a mysterious artificial planetoid designed to destroy anyone who enters.
	The Forge of Creation	16	16	114	November 12, 2010
	Professor Paradox holds the key to stopping Aggregor from tapping into the limitless power of Alien X.
	...Nor Iron Bars a Cage	17	17	115	November 19, 2010
	To settle an old score, Kevin voluntarily returns to the Null Void prison he once escaped.
	The Enemy of My Enemy	18	18	116	December 3, 2010
	Argit infiltrates the Plumbers' Academy with a plan to help the Vreedle Brothers do the last thing anyone would expect.
	Absolute Power: Part 1	19	19	117	December 10, 2010
	Ben is infuriated when Gwen asks Darkstar for his help defeating the team's deadliest, and most unlikely foe of all.
	Absolute Power: Part 2	20	20	118	December 10, 2010
	It's Ben and company's last stand against a foe they can't bring themselves to fight!

Season 2: 2011 - 2012 (Episodes 21 - 52)

Image	Title	Number	Overall	Overall (franchise)	Original Airdate
	The Transmogrification of Eunice	1	21	119	February 4, 2011
	The team discovers a strange alien girl with no memory but Sunder has been hired to capture her!
	Eye of the Beholder	2	22	120	February 11, 2011
	Ship's former owner, Baz-L, has been captured on the moon of a distant planet while stealing gems and Ben, Julie and the crew set out to save him.[revised]
	The Big Story	3	23	121	March 4, 2011
	When a mysterious meteor shower leaves behind an evil alien plant species, Ben 10 super-fan Jimmy steps up to save the day.
	Viktor: The Spoils	4	24	122	February 18, 2011
	The return of the evil Dr. Viktor!
	Girl Trouble	5	25	123	March 11, 2011
	Gwen's cousin, Sunny, pays a visit but she's more than meets the eye!
	Revenge of the Swarm	6	26	124	March 18, 2011
	When Julie is kidnapped, Ben blames Elena who swears she had nothing to do with it. But the Microchips in her lab point to the truth.
	Ben 10,000 Returns	7	27	125	April 15, 2011
	Eon is back and it's up to an older and wiser Ben from the future to help the crew defeat him using the Hands of Armageddon to win the battle.
	The Creature From Beyond	8	28	126	March 25, 2011
	The Forever Knights accidentally unleash an evil force! And at a Bellwood retirement home, a retired Forever Knight suddenly gets a very bad feeling.
	Basic Training	9	29	127	April 1, 2011
	Ben and the crew are forced to go through basic training at the Plumbers' Academy. And you can just imagine how well that goes.
	It's Not Easy Being Gwen	10	30	128	April 8, 2011
	You think it's easy being Gwen? Well you'll have second thoughts after you check out a typical day in the not-so-typical life of Gwen Tennyson.
	Prisoner Number 775 is Missing	11	31	129	April 29, 2011
	When old George enters Area 51 and makes the entire base disappear, Ben and the crew learn that a mysterious Prisoner 775 may be behind it all.
	Moonstruck	12	32	130	April 22, 2011
	Grandpa Max reveals the story of how he met Verdona and how he eventually was recruited to become a Plumber.
	Simian Says	13	33	131	September 23, 2011
	An evil Xenocite queen takes over the Arachnachimps' home planet by attaching herself to a crime lord named Mizaru.[revised]
	Greetings From Techadon	14	34	132	September 30, 2011
	A mysterious object crashes in the center of Bellwood, unleashing Techadon robots with one thing on their mind, destroying Ben!
	The Purge	15	35	133	September 16, 2011
	The Forever Knights factions have been united into one and an all-out war against the aliens on Earth erupts.
	The Flame Keepers' Circle	16	36	134	October 7, 2011
	A fanatical group of whackos have taken to worshiping Vilgax of all people or aliens! And guess who has joined them, Julie!
	Double or Nothing	17	37	135	October 14, 2011
	Albedo, a.k.a. Negative Ben, returns as the star of a big stage production about Ben Tennyson's life. Sure, he needs the money, but what is he really up to?
	The Perfect Girlfriend	18	38	136	October 21, 2011
	When Ben finds himself in an intense battle against Ssserpent, Julie steps in and helps him defeat the slimy brute.
	The Ultimate Sacrifice	19	39	137	October 28, 2011
	Ben is suddenly NOT Ben and it's an all-out revolt as the aliens inside Ben's Ultimatrix demand their freedom.
	The Mother of All Vreedles	20	40	138	November 18, 2011
	Ma Vreedle returns to Earth with a cloning machine and a plan to unleash 300 billion Pretty Boy Vreedles on the planet.
	The Widening Gyre	21	41	139	November 4, 2011
	After a giant garbage-like creature appears and drags a boat down into the ocean, Ben and the crew investigate the Pacific Garbage Vortex.
	A Knight to Remember	22	42	140	December 2, 2011
	Vilgax gets a hold of Old George's sword, and tries to gain Dagon's power. Big mistake! And Ben discovers a new alien hero: Eatle.[revised]
	Solitary Alignment	23	43	141	December 9, 2011
	Azmuth reveals how old George first got the sword and defeated Dagon, and the crew travels to the Middle Ages to learn the truth.
	Inspector #13	24	44	142	February 4, 2012
	A mysterious Techadon Master visits Earth, looking for the Ultimatrix. And he turns out to be more dangerous than any Techadon ever imagined.
	Enemy of My Frenemy	25	45	143	February 11, 2012
	Gwen hopes to rescue Charmcaster. When she asks Hex to join her, he refuses saying he won't join a suicide mission.
	Catch a Falling Star	26	46	144	February 25, 2012
	Movie starlet Jennifer Nocturne springs the evil Captain Nemesis out of jail and the two escape and soon, Ben and Gwen are hot on their trail.
	The Eggman Cometh	27	47	145	March 3, 2012
	When vicious dragons invade Bellwood, it's up to Ben and an all-new alien named Juryrigg to battle the flying demons and return the peace.
	Couples Retreat	28	48	146	February 18, 2012
	After Darkstar opens the Door to Anywhere, Charmcaster comes through and the two team up to give Ben, Gwen and Kevin the fight of a lifetime.
	Night of the Living Nightmare	29	49	147	March 10, 2012
	Albedo is desperate to get his hands on the Ultimatrix and he goes to extreme measures to get it. Once he has invaded Ben's mind, all bets are off.
	The Beginning of the End	30	50	148	March 17, 2012
	As the final battle between the Forever Knights and Dagon's Esoterica heats up, Ben finds himself caught in the middle of an intergalactic showdown.
	The Ultimate Enemy: Part 1	31	51	149	March 24, 2012
	Dagon is getting closer and closer to entering our dimension thanks to an old foe.
	The Ultimate Enemy: Part 2	32	52	150	March 31, 2012
	Vilgax re-emerges in his most powerful form ever! Can Ben stop him?

Crossovers

Image	Title	Original Airdate
	Ben 10/Generator Rex: Heroes United	November 25, 2011
	When a mysterious rift appears over Manhattan, Rex is on the scene to see if there is trouble coming. However when Humungousaur comes from the clouds, Rex gets a bit more than he bargained for! Rex begins battling it out with the Vaxasaurian in Central Park, not realizing that Humungousaur is actually Ben Tennyson. Ben soon discovers he's in an alternate dimension and that he and Rex must team up to overcome their combined foes.