The BEST Episodes of Ben 10: Ultimate Alien

Every episode ever - ranked by fan votes!

Last Updated: Sep 17, 2021

Network: Cartoon Network

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").

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Catch a Falling Star

#1 - Catch a Falling Star

Season 2 - Episode 27 - Aired Feb 25, 2012

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

star 9.08
142 votes
The Ultimate Sacrifice

#2 - The Ultimate Sacrifice

Season 2 - Episode 19 - Aired Oct 28, 2011

The six Ultimate Forms demand their freedom from the Ultimatrix.

star 9.03
183 votes
Solitary Alignment

#3 - Solitary Alignment

Season 2 - Episode 23 - Aired Dec 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.

star 9.03
168 votes
Ben 10,000 Returns

#4 - Ben 10,000 Returns

Season 2 - Episode 10 - Aired Apr 15, 2011

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

star 9.02
303 votes
The Flame Keepers' Circle

#5 - The Flame Keepers' Circle

Season 2 - Episode 16 - Aired Oct 7, 2011

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

star 8.73
160 votes
Escape from Aggregor

#6 - Escape from Aggregor

Season 1 - Episode 5 - Aired May 21, 2010

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

star 8.73
312 votes
Directors: Butch Lukic
Writers: Charlotte Fullerton
Basic Training

#7 - Basic Training

Season 2 - Episode 8 - Aired Apr 1, 2011

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

star 8.71
254 votes
...Nor Iron Bars a Cage

#8 - ...Nor Iron Bars a Cage

Season 1 - Episode 17 - Aired Nov 19, 2010

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

star 8.70
154 votes
Directors: Dan Riba
Writers: Dwayne McDuffie
It's Not Easy Being Gwen

#9 - It's Not Easy Being Gwen

Season 2 - Episode 9 - Aired Apr 8, 2011

A day in the hectic life of Gwen Tennyson.

star 8.68
174 votes
The Purge

#10 - The Purge

Season 2 - Episode 13 - Aired Sep 16, 2011

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

star 8.67
167 votes
The Creature from Beyond

#11 - The Creature from Beyond

Season 2 - Episode 7 - Aired Mar 25, 2011

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

star 8.65
195 votes
The Widening Gyre

#12 - The Widening Gyre

Season 2 - Episode 20 - Aired Nov 4, 2011

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

star 8.63
140 votes
Eye of the Beholder

#13 - Eye of the Beholder

Season 2 - Episode 2 - Aired Feb 11, 2011

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

star 8.62
178 votes
Greetings from Techadon

#14 - Greetings from Techadon

Season 2 - Episode 15 - Aired Sep 30, 2011

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

star 8.56
226 votes
The Ultimate Enemy: Part 2

#15 - The Ultimate Enemy: Part 2

Season 2 - Episode 32 - Aired Mar 31, 2012

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

star 8.52
138 votes
Prisoner Number 775 is Missing

#16 - Prisoner Number 775 is Missing

Season 2 - Episode 12 - Aired Apr 29, 2011

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

star 8.51
197 votes
The Forge of Creation

#17 - The Forge of Creation

Season 1 - Episode 16 - Aired Nov 12, 2010

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

star 8.51
286 votes
Directors: Dan Riba
Writers: Dwayne McDuffie
The Eggman Cometh

#18 - The Eggman Cometh

Season 2 - Episode 28 - Aired Mar 3, 2012

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

star 8.47
155 votes
Enemy of My Frenemy

#19 - Enemy of My Frenemy

Season 2 - Episode 25 - Aired Feb 11, 2012

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

star 8.46
200 votes
Inspector 13

#20 - Inspector 13

Season 2 - Episode 24 - Aired Feb 4, 2012

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

star 8.45
187 votes
Moonstruck

#21 - Moonstruck

Season 2 - Episode 11 - Aired Apr 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.

star 8.43
170 votes
Couples Retreat

#22 - Couples Retreat

Season 2 - Episode 26 - Aired Feb 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.

star 8.40
220 votes
The Beginning of the End

#23 - The Beginning of the End

Season 2 - Episode 30 - Aired Mar 17, 2012

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

star 8.40
166 votes
Night of the Living Nightmare

#24 - Night of the Living Nightmare

Season 2 - Episode 29 - Aired Mar 10, 2012

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

star 8.39
194 votes
The Perfect Girlfriend

#25 - The Perfect Girlfriend

Season 2 - Episode 18 - Aired Oct 21, 2011

The nanochips are back, and have disguised themselves as Julie.

star 8.33
191 votes