The Best Episodes of Ben 10: Ultimate Alien
Last Updated: Nov 16, 2018
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").
#2 - 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.
#3 - Greetings From Techadon
Season 2 - Episode 15
Techadon robots go after Ben on orders from Vulkanus
#4 - Solitary Alignment
Season 2 - Episode 23
Azmuth reveals how Old George got his sword and slayed Diagon.
#5 - The Enemy of My Frenemy
Season 2 - Episode 25
Gwenand the gang revisit Legerdomain in hopes of rescuing Charmcaster.
#6 - 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).
#9 - The Ultimate Sacrifice
Season 2 - Episode 19
The ultimate aliens inside Ben's Ultimatrix demand their freedom!
#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.
#13 - 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.
#14 - 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.
#15 - 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.
#16 - 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.
#19 - 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.
#20 - 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.
#22 - The Transmogrification of Eunice
Season 2 - Episode 1
A mysterious alien girl named Eunice has no memory and is being hunted by Sunder. While evading Sunder, Ben soon discovers that Eunice has nature-based abilities.
#24 - Catch a Falling Star
Season 2 - Episode 27
Jennifer Nocturne is recaptured by Captain Nemesis aka Overlord.
#25 - The Forge Of Creation
Season 1 - Episode 16
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. After a few difficulties, past-Ben teams up with his future self to stop Aggregor. As they make their way through the Forge, they discover many Celestialsapiens in debate with themselves, and eventually a Celestialsapien egg. Aggregor reaches the egg at the same time the group does and takes everyone out with ease. In a last-ditch effort, Kevin absorbs energy from present-Ben's Ultimatrix, but the process drives him insane. He now looks like his old self but has the new aliens instead of the old ones. Kevin easily defeats Aggregor before absorbing his stolen power and attempting to kill him only to be met with opposition from Gwen and both Bens. Past-Ben manages to get through to Kevin, who spares Aggregor's life before flying away, claiming he won't be so merciful tomorrow. Paradox arrives at that moment to take them home before the other Celestialsapiens wake up and return past-Ben to his own time period. Paradox claims that past-Ben will dismiss the entire experience as a dream while present-day Ben resolves to stop Kevin.