The BEST episodes of Ben 10: Ultimate Alien

Every episode of Ben 10: Ultimate Alien ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Ben 10: Ultimate Alien!

Taking place a few weeks after where Ben 10: Alien Force leaves off, Ben 10: Ultimate Alien follows the now sixteen-year-old Ben. The Omnitrix has been destroyed and Ben must learn to master the secrets of the new Ultimatrix, a gauntlet-like version of the old Omnitrix that not only gives him access to all of his original powers and abilities, but also allows him to evolve his alien forms into even stronger and even more powerful versions (called "ultimate forms").

Last Updated: 6/19/2025Network: Cartoon NetworkStatus: Ended

9.02

151 votes

#1 - Catch a Falling Star

Season 2 - Episode 27 - Aired 2/25/2012

Movie star Jennifer Nocturne, who is not in her right mind, teams up with the evil Captain Nemesis.

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8.98

317 votes

#2 - Ben 10,000 Returns

Season 2 - Episode 10 - Aired 4/15/2011

Ben 10,000 returns to help Ben battle a new, dangerous threat.

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8.98

175 votes

#3 - Solitary Alignment

Season 2 - Episode 23 - Aired 12/9/2011

Azmuth reveals how Sir George got his sword and slayed Dagon, and the team decides to make a deal with the First Knight.

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8.95

191 votes

#4 - The Ultimate Sacrifice

Season 2 - Episode 19 - Aired 10/28/2011

The six Ultimate Forms demand their freedom from the Ultimatrix.

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8.72

316 votes

#5 - Escape from Aggregor

Season 1 - Episode 5 - Aired 5/21/2010

The real story behind Aggregor and his escaped prisoners is revealed.

Directors: Butch Lukic

Writer: Charlotte Fullerton

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8.66

161 votes

#6 - ...Nor Iron Bars a Cage

Season 1 - Episode 17 - Aired 11/19/2010

Old feelings resurface when Kevin returns to the Null Void that housed him for years.

Directors: Dan Riba

Writer: Dwayne McDuffie

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8.62

170 votes

#7 - The Flame Keepers' Circle

Season 2 - Episode 16 - Aired 10/7/2011

Julie joins a fanatical group who, unbeknownst to her, have discovered Vilgax and worship him.

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8.62

175 votes

#8 - The Purge

Season 2 - Episode 13 - Aired 9/16/2011

Old George brings the Forever Knights in one group in order to vanquish every alien being on Earth.

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8.61

266 votes

#9 - Basic Training

Season 2 - Episode 8 - Aired 4/1/2011

Ben, Gwen, and Kevin are forced to go through basic training at the Plumbers' Academy.

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8.56

185 votes

#10 - It's Not Easy Being Gwen

Season 2 - Episode 9 - Aired 4/8/2011

A day in the hectic life of Gwen Tennyson.

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8.53

209 votes

#11 - The Creature from Beyond

Season 2 - Episode 7 - Aired 3/25/2011

An evil creature released from another dimension has plans to enslave the human race for its master.

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8.52

209 votes

#12 - Prisoner Number 775 is Missing

Season 2 - Episode 12 - Aired 4/29/2011

The team takes a look at the real purpose of Area 51 and have to recapture an escaped alien prisoner.

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8.52

234 votes

#13 - Greetings from Techadon

Season 2 - Episode 15 - Aired 9/30/2011

Ben finds himself in an inescapable situation when Techadons, custom-made to destroy him, start coming after him.

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8.51

142 votes

#14 - The Widening Gyre

Season 2 - Episode 20 - Aired 11/4/2011

The team battles a new, dangerous threat in the Pacific Ocean.

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8.51

292 votes

#15 - The Forge of Creation

Season 1 - Episode 16 - Aired 11/12/2010

When Aggregor goes after the limitless power of Alien X, the gang are forced to do whatever it takes...

Directors: Dan Riba

Writer: Dwayne McDuffie

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8.48

185 votes

#16 - Eye of the Beholder

Season 2 - Episode 2 - Aired 2/11/2011

When Baz-El gets captured, it's up to Ben and the others to rescue him.

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8.45

149 votes

#17 - The Ultimate Enemy (2)

Season 2 - Episode 32 - Aired 3/31/2012

Vilgax betrays Dagon so that he can absorb all of his power to destroy his one true enemy: Ben Tennyson.

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8.44

207 votes

#18 - Enemy of My Frenemy

Season 2 - Episode 25 - Aired 2/11/2012

Ben, Gwen, and Kevin set out to rescue Charmcaster from Ledgerdomain, but, unbeknownst to them, Charmcaster has plans of her own.

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8.41

165 votes

#19 - The Eggman Cometh

Season 2 - Episode 28 - Aired 3/3/2012

Dr. Animo returns with an army of dragon-like mutants, while Ben has his own problems with his new transformation, Juryrigg.

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8.41

175 votes

#20 - The Beginning of the End

Season 2 - Episode 30 - Aired 3/17/2012

The Flame Keepers' Circle try to release Dagon from his dimension, but Vilgax is released instead.

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8.40

230 votes

#21 - Couples Retreat

Season 2 - Episode 26 - Aired 2/18/2012

Darkstar finds his way into Ledgerdomain, where he seduces Charmcaster, using her energies in his latest attempt to destroy Ben, Gwen, and Kevin.

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8.39

196 votes

#22 - Inspector 13

Season 2 - Episode 24 - Aired 2/4/2012

A mysterious weapon master from Techadon visits Earth and wants the Ultimatrix to enhance his creations.

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8.31

182 votes

#23 - Moonstruck

Season 2 - Episode 11 - Aired 4/22/2011

Max tells the kids about his first encounter with aliens and the story of how he and Verdona met and fell in love.

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8.29

204 votes

#24 - Night of the Living Nightmare

Season 2 - Episode 29 - Aired 3/10/2012

Albedo tries to reclaim the Ultimatrix from Ben by transporting him into one of his own worst nightmares.

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8.25

163 votes

#25 - The Ultimate Enemy (1)

Season 2 - Episode 31 - Aired 3/24/2012

Dagon breaks out of the seal and turns all humans into Flame Keepers' Circle soldiers.

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