The BEST episodes of Ben 10: Ultimate Alien season 1

Every episode of Ben 10: Ultimate Alien season 1, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Ben 10: Ultimate Alien season 1!

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: 9/21/2024Network: Cartoon NetworkStatus: Ended
Escape from Aggregor
star
8.72
313 votes

#1 - 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
Watch Now:Amazon
...Nor Iron Bars a Cage
star
8.69
158 votes

#2 - ...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
Watch Now:Amazon
The Forge of Creation
star
8.51
289 votes

#3 - 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
Watch Now:Amazon
Hero Time
star
8.15
293 votes

#4 - Hero Time

Season 1 - Episode 9 - Aired 6/18/2010

Ben's childhood hero makes a comeback while he's on a date with a beautiful, young movie actress.

Directors: Matt Youngberg
Watch Now:Amazon
Fused
star
8.15
304 votes

#5 - Fused

Season 1 - Episode 8 - Aired 6/11/2010

Ben accidentally gets fused with Aggregor's fifth prisoner who has no plans of getting out of his body!

Directors: Dan Riba
Watch Now:Amazon
Absolute Power (1)
star
8.15
244 votes

#6 - Absolute Power (1)

Season 1 - Episode 19 - Aired 12/10/2010

When Ben and Gwen are faced with an unexpected enemy, Gwen turns to Darkstar for help.

Directors: Dan Riba
Watch Now:Amazon
Map of Infinity
star
8.07
245 votes

#7 - Map of Infinity

Season 1 - Episode 11 - Aired 10/10/2010

Ben must stop the newly transformed and extremely dangerous Aggregor from attaining the first piece of the Map of Infinity.

Directors: Matt Youngberg
Watch Now:Amazon
Absolute Power (2)
star
8.05
205 votes

#8 - Absolute Power (2)

Season 1 - Episode 20 - Aired 12/10/2010

Gwen and Ben have to do whatever it takes to bring down the "mad dog" Kevin.

Directors: Dan Riba
Watch Now:Amazon
Where the Magic Happens
star
8.00
240 votes

#9 - Where the Magic Happens

Season 1 - Episode 14 - Aired 10/29/2010

Gwen is forced to team up with her nemesis, Charmcaster, when the team finds themselves to have to stop Aggregor!

Directors: Butch Lukic
Writer: Matt Wayne
Watch Now:Amazon
Perplexahedron
star
7.98
251 votes

#10 - Perplexahedron

Season 1 - Episode 15 - Aired 11/5/2010

With the fourth piece of the Map of Infinity almost in Aggregor's clutches, the gang chase him through the artificial planetoid known as the Perplexahedron.

Directors: Matt Youngberg
Watch Now:Amazon
Video Games
star
7.97
335 votes

#11 - Video Games

Season 1 - Episode 4 - Aired 5/14/2010

Will Harangue comes up with a mastermind plan to put an end to Ben, the 'menace'.

Directors: Dan Riba
Writer: Eugene Son
Watch Now:Amazon
Too Hot to Handle
star
7.91
278 votes

#12 - Too Hot to Handle

Season 1 - Episode 6 - Aired 5/28/2010

After Kevin accidentally releases Aggregor's third prisoner from a suit that protects others from his radiation, the gang has to stop him from radiating the Earth!

Directors: Matt Youngberg
Watch Now:Amazon
Ultimate Aggregor
star
7.89
297 votes

#13 - Ultimate Aggregor

Season 1 - Episode 10 - Aired 10/10/2010

Aggregor, having recaptured the five aliens, puts his ultimate plan into action.

Directors: Matt Youngberg
Watch Now:Amazon
Andreas' Fault
star
7.82
222 votes

#14 - Andreas' Fault

Season 1 - Episode 7 - Aired 6/4/2010

The gang encounter Argit, who has teamed up with the Forever Knights and Aggregor's fourth prisoner.

Directors: Dan Riba
Watch Now:Amazon
The Enemy of My Enemy
star
7.79
234 votes

#15 - The Enemy of My Enemy

Season 1 - Episode 18 - Aired 12/3/2010

Argit asks for protection from Ben and Gwen after Kevin decides to finish him off.

Directors: Matt Youngberg
Writer: Len Uhley
Watch Now:Amazon
Hit 'Em Where They Live
star
7.79
394 votes

#16 - Hit 'Em Where They Live

Season 1 - Episode 3 - Aired 5/7/2010

Zombozo, Charmcaster, and Vulkanus form an alliance and plan to ambush Ben's parents.

Directors: Matt Youngberg
Writer: Len Wein
Watch Now:Amazon
Deep
star
7.70
269 votes

#17 - Deep

Season 1 - Episode 13 - Aired 10/22/2010

Ben and the gang travel to a water planet in order to stop Aggregor from obtaining the second piece of the Map of Infinity.

Directors: Dan Riba
Watch Now:Amazon
Fame
star
7.69
425 votes

#18 - Fame

Season 1 - Episode 1 - Aired 4/23/2010

Ben's secret identity is exposed, casting him into the spotlight. Elsewhere, an alien plans to detonate a nuclear bomb.

Directors: Dan Riba
Watch Now:Amazon
Reflected Glory
star
7.50
229 votes

#19 - Reflected Glory

Season 1 - Episode 12 - Aired 10/15/2010

Cash and J.T. take credit for Ben's successes, so Psyphon comes back thinking J.T. and Cash were responsible for Vilgax's defeat!

Directors: Matt Youngberg
Writer: Peter David
Watch Now:Amazon
Duped
star
7.40
406 votes

#20 - Duped

Season 1 - Episode 2 - Aired 4/30/2010

Ben uses Echo Echo to make two clones of himself to attempt to be in three places at once.

Directors: Butch Lukic
Writer: Len Uhley
Watch Now:Amazon