List of Ben 10: Ultimate Alien episodes

The following is a list of episodes of the American animated television series Ben 10: Ultimate Alien. A total of fifty-two episodes have been ordered so far: 20 for the first season, and 32 for the second season

Series overview

Season		Episodes	First airdate	Last airdate	Main villains
	1	20	April 23, 2010 (2010-04-23)	December 10, 2010 (2010-12-10)	Aggregor and Ultimate Kevin
	2	32	February 4, 2011 (2011-02-04)	March 31, 2012 (2012-03-31)	Sir George, Diagon and Vilgax

Episode list

Season 1 (2010)

#	Title	Director	Writer(s)	Original U.S. airdate	Prod. code
1	"Fame"	Dan Riba	Dwayne McDuffie	April 23, 2010 (2010-04-23)	101
Ben's secret identity is exposed, casting him into the spotlight. Elsewhere, the first of the five alien prisoners captured by Agreggor (named Bivalvin) plans to detonate a nuclear bomb to repair his spaceship.
2	"Duped"	Butch Lukic	Len Uhley	April 30, 2010 (2010-04-30)	102
Ben feels the pressure of fame and finds a way to be in three places at once.
3	"Hit 'Em Where They Live"	Matt Youngberg	Len Wein	May 7, 2010 (2010-05-07)	103
With Ben's identity revealed, Zombozo, Charmcaster and Vulkanus team up to destroy his parents.
4	"Video Games"	Dan Riba	Eugene Son	May 14, 2010 (2010-05-14)	104
Ben stars in a video game which is really a trap set by Will Harangue.
5	"Escape From Aggregor"	Butch Lukic	Charlotte Fullerton	May 21, 2010 (2010-05-21)	105
Galapeagus, the second of the five aliens captured by Agreggor, tells the story of the how he and four other aliens escaped Agreggor.
6	"Too Hot To Handle"	Matt Youngberg	Marty Isenberg	May 28, 2010 (2010-05-28)	106
Pandor, the third of the five aliens captured by Agreggor, dupes Kevin into releasing him from his containment unit, making him near unstoppable.
7	"Andreas’ Fault"	Dan Riba	Ernie Altbacker Jim Krieg	June 4, 2010 (2010-06-04)	107
Thanks to his newfound "friend" Andreas, Argit lands a leadership position with the Forever Knights, much to the gang's chagrin.
8	"Fused"	Butch Lukic	Len Uhley	June 11, 2010 (2010-06-11)	108
Ben is stuck in his newest alien form, AmPhibian, and is targeted by Aggregor, who plans to destroy him.
9	"Hero Time"	Matt Youngberg	Steven Barnes	June 18, 2010 (2010-06-18)	109
Ben must defeat his childhood idol, Captain Nemesis, who is secretly evil. Meanwhile there is tension between Ben and Julie after an actress kisses him.
10	"Ultimate Aggregor"	Dan Riba	Dwayne McDuffie	October 10, 2010 (2010-10-10)	110
Aggregor's plot is unveiled. He fuses himself with Bivalvin, Galapeagus, Phandor, Andreas, and Ra'ad to become Ultimate Agreggor. Could it be too late to thwart him?
11	"Map of Infinity"	Butch Lukic	Dwayne McDuffie	October 10, 2010 (2010-10-10)	111
The team track down the first piece of the Map of Infinity that Aggregor's after on a half-frozen, half-molten planet. If Agreggor gets all four pieces, he'll be able to go to the Forge of Creation, where he can get limitless power.
12	"Reflected Glory"	Matt Youngberg	Peter David	October 15, 2010 (2010-10-15)	112
Cash and J.T. take credit for Ben's heroics and Psyphon targets them, believing they defeated Vilgax.
13	"Deep"	Dan Riba	Marty Isenberg	October 22, 2010 (2010-10-22)	113
The team goes to a water planet, where they think they'll find Aggregor looking for the second piece of the Map.
14	"Where the Magic Happens"	Butch Lukic	Matt Wayne	October 29, 2010 (2010-10-29)	114
Gwen has to persuade Charmcaster to help the team survive in a magical dimension where they think they'll find Aggregor looking for the third piece of the Map.
15	"Perplexahedron"	Matt Youngberg	Brian Swenlin	November 5, 2010 (2010-11-05)	115
The team goes to a cube-like planet where they think they'll find Aggregor and the last piece of the Map.
16	"The Forge of Creation"	Dan Riba	Dwayne McDuffie	November 12, 2010 (2010-11-12)	116
Professor Parodox takes the team to a place called the Forge of Creation to thwart Aggregor, who has all four pieces of the map, one last time. They stop Aggregor but Kevin is mutated and yet again becomes Ultimate Kevin.
17	"...Nor Iron Bars a Cage"	Dan Riba	Len Wein	November 19, 2010 (2010-11-19)	117
Kevin returns to a prison planet to get revenge on the manager who killed his friend and Ben and Gwen have to stop him.
18	"The Enemy Of My Enemy"	Matt Youngberg	Len Uhley	December 3, 2010 (2010-12-03)	118
Argit helps the Vreedle Brothers pass by infiltrating the Plumbers Academy.
19–20	"Absolute Power"	Dan Riba	Charlotte Fullerton	December 10, 2010 (2010-12-10)	119–120
Ben and Gwen seek Darkstar's help to battle Kevin. As Kevin grows stronger, Ben and Gwen get Cooper's help to drain him of his power.

Season 2 (2011-2012)

#	Title	Director	Writer(s)	Original U.S. airdate	Prod. code
21	"The Transmogrification of Eunice"	Dan Riba	Eugene Son	February 4, 2011 (2011-02-04)	201
The gang come across an amnesiac alien who's being hunted by Sunder.
22	"Eye of the Beholder"	Dan Riba	Len Uhley	February 11, 2011 (2011-02-11)	202
Ben and friends set out to rescue the captured Baz-L.
23	"Viktor: The Spoils"	Butch Lukic	Kevin Grevioux	February 18, 2011 (2011-02-18)	203
An aged monarch uses the frozen remains of Dr. Viktor as his new body.
24	"The Big Story"	Matt Youngberg	Ernie Altbacker Jim Krieg	March 4, 2011 (2011-03-04)	204
Jimmy comes to the rescue when the gang face evil alien plants.
25	"Girl Trouble"	Dan Riba	Eugene Son	March 11, 2011 (2011-03-11)	205
Gwen's cousin visits, and she's hiding a secret.
26	"Revenge of the Swarm"	Butch Lukic	Stan Berkowitz	March 18, 2011 (2011-03-18)	206
Elena and the nanochips return with a twist.
27	"The Creature from Beyond"	Dan Riba	Len Uhley	March 25, 2011 (2011-03-25)	207
An evil creature has plans to enslave humans after his accidental release from another dimension.
28	"Basic Training"	Butch Lukic	Adam Beechen	April 1, 2011 (2011-04-01)	208
Ben and the gang train at the Plumber's Academy with Magister Hulka, later dealing with a menacing tetramand.
29	"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 re-capture Dr. Animo, fill out invitations for her mom's family reunion, help Kevin get into school, finish exams, and go to her best friend Emily's piano performance. Can she do it all?
30	"Ben 10,000 Returns"	Matt Youngberg	Dwayne McDuffie	April 15, 2011 (2011-04-15)	210
Joining Paradox on the hunt for Eon, an enemy of a self from an alternate timeline, Ben meets his actual future self.
31	"Moonstruck"	Butch Lukic	Len Uhley	April 22, 2011 (2011-04-22)	211
The history of Max and Verdona Tennyson is revealed in flashbacks.
32	"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.
33	"The Purge"	Butch Lukic	David McDermott	September 16, 2011 (2011-09-16)	213
With the help of the Forever Knights, Old George starts a war against all aliens on Earth. He plans to have the aliens on Earth forcefully evicted while having Driscoll oversee it.
34	"Simian Says"	Matt Youngberg	Charlotte Fullerton	September 23, 2011 (2011-09-23)	214
Simian accidentally unleashes a Xenocyte Queen which orchestrates an invasion of the Arachnachimps' planet. When Eunice goes missing, Ben, Gwen, and Kevin end up helping Simian liberate the Arachnachimps' planet from a DNAlien version of the Arachnachimp Mizaru.
35	"Greetings From Techadon"	Dan Riba	Eugene Son	September 30, 2011 (2011-09-30)	215
Techadon robots go after Ben on orders from Vulkanus.
36	"Flame Keeper's Circle"	Dan Riba	Brian Swenlin	October 7, 2011 (2011-10-07)	216
Julie joins a cult called the Flame Keepers' Circle. Ben discovers that the Flame Keepers' Circle worships Vilgax, whom they mistook for Dagon, a destructive squid-like monster.
37	"Double or Nothing"	Matt Youngberg	Len Uhley	October 14, 2011 (2011-10-14)	217
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	"The Perfect Girlfriend"	Dan Riba	Stan Berkowitz	October 21, 2011 (2011-10-21)	218
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 never truly loved Ben.
39	"The Ultimate Sacrifice"	Butch Lukic	Dwayne McDuffie J.M. DeMatteis	October 28, 2011 (2011-10-28)	219
The ultimate aliens inside Ben's Ultimatrix demand their freedom and end up sucking Ben into the Ultimatrix. While Gwen assumes her Anodite form to enter the Ultimatrix to help Ben, Kevin travels to Galvan Prime to convince Azmuth to help.
40	"The Widening Gyre"	Matt Youngberg	Eugene Son	November 4, 2011 (2011-11-04)	220
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	"The Mother of All Vreedles"	Dan Riba	Matt Wayne	November 11, 2011 (2011-11-11)	221
Ma Vreedle plans to spawn an army of Pretty Boy Vreedle clones, which could dry up Earth's oceans.
42	"A Knight to Remember"	Butch Lukic	Len Uhley	December 2, 2011 (2011-12-02)	222
Vilgax and the Flame Keepers' Circle fight against George and the Forever Knights along with Ben Tennyson. Vigax gets Diagon's heart and ends up being sucked into Diagon's dimension.
43	"Solitary Alignment"	Matt Youngberg	Peter David	December 9, 2011 (2011-12-09)	223
Azmuth reveals how Old George got his sword and slew Diagon.
44	"Inspector 13"	Butch Lukic	Geoffrey Thorne	February 4, 2012 (2012-02-04)	224
Techadon Weapon Master 13 arrives on Earth and demands the Ultimatrix.
45	"The Enemy of My Frenemy"	Matt Youngberg	David McDermott	February 11, 2012 (2012-02-11)	225
Gwen and the gang set out to rescue Charmcaster.
46	"Couples Retreat"	Dan Riba	Geoffrey Thorne	February 18, 2012 (2012-02-18)	228
Darkstar seduces Charmcaster and uses her power to his own advantage. Meanwhile, Gwen and Kevin have a disagreement over the protection of one of her spell books.
47	"Catch a Falling Star"	Butch Lukic	Len Uhley	February 25, 2012 (2012-02-25)	226
Jenifer Nocturne runs away with Captian Nemesis after freeing him from jail in hopes of creating a new life with him.
48	"The Eggman Cometh"	Matt Youngberg	Stan Berkowitz	March 3, 2012 (2012-03-03)	227
Dr. Animo returns with a plot to transform eggs into pterodactyls.
49	"Night of the Living Nightmare"	Dan Riba	Don McGregor	March 10, 2012 (2012-03-10)	229
Albedo attempts to get even with Ben, by trapping him in a dream version of Bellwood, and dispatching an assortment of villains, as well as versions of Gwen and Kevin desiring the Ultimatrix, to attempt to defeat him. In the end, Ben successfully defeats Albedo, and the whole episode is revealed to be set in Albedo's mind, when his attempt to place a Dream Eater on Ben fails miserably.
50	"The Beginning of the End"	Butch Lukic	Charlotte Fullerton Eugene Son	March 17, 2012 (2012-03-17)	230
The Forever Knights battle Diagon's Esoterica, and Ben's plan to help the knights fails.
51–52	"The Ultimate Enemy"	Matt Youngberg (Part 1) Dan Riba (Part 2)	Matt Wayne (Part 1) Dwayne McDuffie (Part 2)	(Part 1) March 24, 2012 (Part 2) March 31, 2012	231-232
Ben, Gwen, Kevin, and George trash Diagon's City while battling a reborn, Lucubra-morphed, power hungry Vilgax. Diagon is released and plans to become ruler of Ben's Universe. Note: This episode is dedicated to the memory of Dwayne McDuffie, one of the writers of Ben 10, who died on February 21, 2011.

DVD releases

Volume	Season	Aspect ratio	Episodes	Time length	Release date
1. Ben 10: Ultimate Alien – Escape From Aggregor	1	16:9	10 (Episodes 1–10)	223 minutes	January 11, 2011 December 1, 2010
2. Ben 10: Ultimate Alien – Power Struggle	1	16:9	10 (Episodes 11–20)	230 minutes	May 3, 2011 April 5, 2011
3. Ben 10: Ultimate Alien – The Return of Heatblast	2	16:9	10 (Episodes 21–30)	230 minutes	August 2, 2011 September 11, 2011
4. Ben 10: Ultimate Alien – The Wild Truth	2	16:9	12 (Episodes 31–42)	276 minutes	December 6, 2011 November 30, 2011
5. Ben 10: Ultimate Alien – The Ultimate Ending	2	16:9	10 (Episodes 43–52)	220 minutes	April 17, 2012 March 21, 2012