The BEST Episodes of Ben 10: Ultimate Alien
Every episode ever - ranked by fan votes!
Last Updated: Mar 31, 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").
#1 - Ben 10,000 Returns
Season 2 - Episode 10 - Aired Apr 15, 2011
Following a visit from Paradox after a fight with Eon, Ben 10,000 arrives 20 years from the future to seek the aid of his past counterpart in tracking down Eon.
8.91 
#2 - Solitary Alignment
Season 2 - Episode 23 - Aired Dec 9, 2011
Azmuth reveals how Old George got his sword and slayed Diagon.
8.89 
#3 - The Ultimate Sacrifice
Season 2 - Episode 19 - Aired Oct 28, 2011
The ultimate aliens inside Ben's Ultimatrix demand their freedom!
8.86 
#4 - Catch a Falling Star
Season 2 - Episode 27 - Aired Feb 25, 2012
Jennifer Nocturne is recaptured by Captain Nemesis aka Overlord.
8.85 
#5 - Escape from Aggregor
Season 1 - Episode 5 - Aired May 21, 2010
In the Himalayas, Dr. Animo and his mind-controlled Yeti were fighting with Ben. Ben, as Brainstorm, mind-controls the Yeti and frees him. Kevin and Gwen deactivates the Devalution bomb. Gwen calls the Plumbers to take them, the Plumbers informed them that there is an alien action in Bellwood. Ben encounters the turtle-like alien Galapagus, who was on a rampage to find Ben. He escaped from Aggregor and tells Ben how he ended up captured alongside four other aliens in a plot to permanently absorb their powers.
8.62 
#6 - Basic Training
Season 2 - Episode 8 - Aired Apr 1, 2011
Ben, Gwen, and Kevin are summoned to a Plumbers' Academy to go under training that is supervised by Magister Hulka.
8.62 
#7 - ...Nor Iron Bars a Cage
Season 1 - Episode 17 - Aired Nov 19, 2010
With Kevin having absorbed Ben's aliens and become insane once again, Ben and Gwen have to go to the null void prison in an attempt to stop Kevin from destroying all the people there. We learn more about how Kevin got his material absorbing powers. In the end Ben thinks Kevin should be put down.
8.55 
#8 - It's Not Easy Being Gwen
Season 2 - Episode 9 - Aired Apr 8, 2011
Gwen has always been a multi-tasker, trying to juggle school, hobbies, friends and her work as a hero, waking up early and going to sleep late. But Gwen's already packed day is about to get worse when Dr. Animo attacks with an army of giant frogs and Gwen is forced to make a hard choice.
8.55 
#9 - The Flame Keepers' Circle
Season 2 - Episode 16 - Aired Oct 7, 2011
Julie joins a cult that worships Vilgax
8.51 
#10 - Eye of the Beholder
Season 2 - Episode 2 - Aired Feb 11, 2011
Ben, Julie and the rest of the heroic crew embark on a dangerous journey that could cost them all their lives in an effort to achieve the safe return of Ship and his former owner Baz-L.
8.50 
#11 - The Creature from Beyond
Season 2 - Episode 7 - Aired Mar 25, 2011
The Forever Knights unleash an evil force mistaken for an ancient weapon.
8.48 
#12 - The Widening Gyre
Season 2 - Episode 20 - Aired Nov 4, 2011
The gang looks into the Pacific Garbage Vortex at the request of the government.
8.47 
#13 - The Purge
Season 2 - Episode 13 - Aired Sep 16, 2011
With the help of The Forever Knights, Old George starts a war against all aliens on Earth.
8.46 
#14 - Greetings from Techadon
Season 2 - Episode 15 - Aired Sep 30, 2011
Techadon robots go after Ben on orders from Vulkanus
8.41 
#15 - The Forge of Creation
Season 1 - Episode 16 - Aired Nov 12, 2010
Azmuth is upset with Ben, Gwen, and Kevin for letting Aggregor get all the pieces of the Map of Infinity. Ben resolves to become Alien X to get Bellicus and Serena to cooperate. When this fails, Paradox arrives and changes Alien X back to Ben. After a brief argument, Paradox and Azmuth explain that the Forge of Creation is where all Celestialsapiens (Alien X's race) are born, and Aggregor hopes to absorb the powers of a newborn Celestialsapien and become all-powerful. Paradox takes them to the Forge of Creation, where an accident pulls Ben's ten-year-old self out of the timestream.
8.39 
#16 - The Ultimate Enemy (2)
Season 2 - Episode 32 - Aired Mar 31, 2012
Ben's fight with Vilgax and the Dagon continues in this final episode.
8.36 
#17 - Enemy of My Frenemy
Season 2 - Episode 25 - Aired Feb 11, 2012
Gwenand the gang revisit Legerdomain in hopes of rescuing Charmcaster.
8.34 
#18 - Prisoner Number 775 is Missing
Season 2 - Episode 12 - Aired Apr 29, 2011
The secrets of Area 51 are revealed to Ben Tennyson by Colonel Rosum after Old George infiltrates Area 51. (ChamAilen and Ultimate Wildmutt first appears in this episode).
8.34 
#19 - Moonstruck
Season 2 - Episode 11 - Aired Apr 22, 2011
The history of Max and Verdona Tennyson in flashbacks.
8.29 
#20 - Inspector 13
Season 2 - Episode 24 - Aired Feb 4, 2012
A mysterious weapon master from Techadon visits Earth and wants the Ultimatrix.
8.27 
#21 - Couples Retreat
Season 2 - Episode 26 - Aired Feb 18, 2012
Charmcaster and Darkstar team up to destroy Ben, Gwen and Kevin.
8.25 
#22 - The Eggman Cometh
Season 2 - Episode 28 - Aired Mar 3, 2012
Dr. Animo returns with a plot to transform eggs into pterodactyls.
8.24 
#23 - Night of the Living Nightmare
Season 2 - Episode 29 - Aired Mar 10, 2012
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.
8.21 
#24 - The Beginning of the End
Season 2 - Episode 30 - Aired Mar 17, 2012
The Forever Knights battle Diagon's Esoterica, and Ben's plan to help the knights fails.
8.18 
#25 - The Perfect Girlfriend
Season 2 - Episode 18 - Aired Oct 21, 2011
The Perfect Girlfriend
8.15