The BEST Episodes of Ben 10: Ultimate Alien
Every episode ever - ranked by fan votes!
Last Updated: Aug 10, 2019
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
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.
8.52 
#2 - Greetings From Techadon
Season 2 - Episode 15
Techadon robots go after Ben on orders from Vulkanus
8.42 
#3 - Solitary Alignment
Season 2 - Episode 23
Azmuth reveals how Old George got his sword and slayed Diagon.
8.38 
#4 - The Enemy of My Frenemy
Season 2 - Episode 25
Gwenand the gang revisit Legerdomain in hopes of rescuing Charmcaster.
8.38 
#5 - Prisoner #775 is Missing
Season 2 - Episode 12
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).
8.36 
#6 - Moonstruck
Season 2 - Episode 11
The history of Max and Verdona Tennyson in flashbacks.
8.35 
#7 - Map of Infinity
Season 1 - Episode 11
With his new powers, Aggregor easily defeats Ben and his friends. Azmuth tells Ben that Aggregor intends to steal the Map of Infinity, a complete map of the entire universe. With it, he'll be able to find the Forge of Creation, the birthplace of the universe. He further explains that Aggregor stole the five aliens' powers to protect him from the traps guarding the map, which is split into four pieces. In order to keep him from assembling the map, the team tries to take one of the pieces first. Aggregor, however, simply follows them and steals it after they disable the traps for him.
8.31 
#8 - The Ultimate Sacrifice
Season 2 - Episode 19
The ultimate aliens inside Ben's Ultimatrix demand their freedom!
8.29 
#9 - Revenge of the Swarm
Season 2 - Episode 6
Victor Validus resurfaces and attacks Ben at night. Elena Validus and the nanochips return.
8.26 
#10 - It's Not Easy Being Gwen
Season 2 - Episode 9
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.
8.21 
#11 - Eye of the Beholder
Season 2 - Episode 2
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.
8.21 
#12 - Escape From Aggregor
Season 1 - Episode 5
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. Galapagus ended up telling Ben how he, Bivalvan, Andreas, Ra'ad, and P'andor escaped from Aggregor when Magister Prior Ghilhil answered the distress call and did an inspection which ended with Magister Prior Ghilhil getting knocked out by Aggregor. Though the aliens escaped from Aggregor's spaceship, they crash-landed on Earth. After Ben's Ultimatrix scans Galapagus' DNA, he arranges for the Plumbers to get Galapagus back to his home planet. Unfortunately for Galapagus, Aggregor was posing as a Plumber.
8.19 
#13 - The Perfect Girlfriend
Season 2 - Episode 18
The Perfect Girlfriend
8.19 
#14 - Girl Trouble
Season 2 - Episode 5
Gwen is excited by the prospect of her cousin Sunny paying the team a visit while dealing with the Robots of Dimension 12. But her excitement quickly turns into trepidation when it is uncovered that her cousin is not all that she appears and has some particularly sinister intentions.
8.15 
#15 - The Flame Keeper's Circle
Season 2 - Episode 16
Julie joins a cult that worships Vilgax
8.12 
#16 - Nor Iron Bars a Cage
Season 1 - Episode 17
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.
8.11 
#17 - Andreas' Fault
Season 1 - Episode 7
When Ben, Kevin, and Gwen investigate an odd string of thefts by the Forever Knights, they learn that Argit is using Andreas (one of the aliens being hunted by Aggregor) to frighten them into making him their leader. Argit's plans go bad when the Forever Knights eventually revolt, and throw him into a dungeon with Ben and the others. When they discover that the Knights plan to execute Andreas, they break out and save him. But when a Forever Knight sets a bomb that would level the entire castle, Andreas sacrifices himself to absorb the force of the explosion. Although Ben and company believed him to be dead, Andreas survived the explosion. Unfortunately, the endeavor of stopping the bomb made him too weak to resist Aggregor as he recaptures him.
8.09 
#18 - Perplexahedron
Season 1 - Episode 15
With the fourth piece of the Map of Infinity almost in Aggregor's clutches, the gang chase him through the artificial planetoid known as Perplexahedron.
8.08 
#19 - Basic Training
Season 2 - Episode 8
Ben, Gwen, and Kevin are summoned to a Plumbers' Academy to go under training that is supervised by Magister Hulka.
8.06 
#20 - Hit 'Em Where They Live
Season 1 - Episode 3
After Jimmy Jones reveals Ben's identity, some of his enemies (such as Zombozo, Rojo, Charmcaster, Vulkanus, and Sevenseven) team up to try to attack his family. Now Ben and his friends have to protect them no matter what.
8.06 
#21 - Absolute Power (2)
Season 1 - Episode 20
Ben and Gwen are forced to go to Darkstar for help when they come across their most deadly, most unexpected foe yet.
8.06 
#22 - Catch a Falling Star
Season 2 - Episode 27
Jennifer Nocturne is recaptured by Captain Nemesis aka Overlord.
8.05 
#23 - Video Games
Season 1 - Episode 4
After defeating Ssserpent with Fourarms, Ben's celebrity status lands him in a starring role in a video game. The developers ask him to show off all his aliens' different moves so they can be implemented into the game. In reality, TV reporter Will Harangue has been using the video game to build a giant spider-like robot that knows all of Ben's aliens' moves from when he openly showed them. After being defeated twice by Harangue's robot, he challenges Ben to a final showdown on live TV. After realizing how Harangue's robot can predict his aliens' moves, Ben uses Humongousaur with sumo slammer moves to fight it. He damages it until it has lost control, but its still shooting randomly. Ben then turns into Nanomech which was the only alien with moves that were not installed into the robot, Ben is able to defeat it from the inside.
8.04 
#24 - The Purge
Season 2 - Episode 13
With the help of The Forever Knights, Old George starts a war against all aliens on Earth.
8.00 
#25 - Duped
Season 1 - Episode 2
Ben needs to be at more than one place at once; he has to fight the Forever Knights with Kevin, go to Julie's tennis game, and see a Sumo Slammers movie. So Ben transforms into Echo Echo and divides in three and changes back to Ben, but this time there are three Bens with one part of his personality. One is the real Ben, the other is the honest, intimate Ben, and the last one is the immature Ben. The Honest Ben goes with Kevin to the museum, the Immature Ben stays to watch Julie's match, and the real Ben goes to see Sumo Slammers. Urien (a king of a fraction of Forever Knights) is after some strong suit of battle armor. When Honest Ben and Kevin are in danger, Urian is in the battle armor and attack Intimate Ben and Kevin, the real Ben and the immature Ben have to help them stop Urian. All the Bens go Echo Echo and change back into one. Ben later defeats Urian with Lodestar and heads to back to the tennis match, where its revealed that his plan backfired and he is scolded by his friends for his foolish plan which ruins Julie's game (although she won) and causes Julie to angrily storm off. Gwen angrily storms off too, along with Kevin, leaving Ben all alone to repent for what he's done.
7.96