Ben 10: Ultimate Alien backdrop
Animation•Action & Adventure•Sci-Fi & Fantasy

The Best Episodes of Ben 10: Ultimate Alien

Every episode of Ben 10: Ultimate Alien ranked from best to worst. Let's dive into the Best Episodes of Ben 10: Ultimate Alien!

Binge this in 19h 56m•Peaking at 9.4/10

With his secret identity now revealed to the world, Ben Tennyson continues to fight evil as a superhero with the help of the newly acquired Ultimatrix.

Airs on
Cartoon Network
BestEpisodes
WorstEpisodes
BestSeasons
AllEpisodes

Seasons2

All12

Episode Rankings

  1. #1 Fan Favorite
    Click to reveal
    Ben 10: Ultimate Alien Season 2 Episode 25 - The Enemy of My Frenemy
    9.4/10(5 votes)

    #1 - The Enemy of My Frenemy

    S2:E25

    Gwen and co revisit Legerdomain in hopes of rescuing Charmcaster.

    Director:Matt Youngberg
    Writers:Brian Swenlin, David McDermott

    Be the first to start the conversation for this episode

  2. Ben 10: Ultimate Alien Season 2 Episode 26 - Couples Retreat
    9.4/10(5 votes)

    #2 - Couples Retreat

    S2:E26

    After Darkstar opens the Door to Anywhere, Charmcaster comes through, and the two team up to give Ben, Gwen, and Kevin the fight of a lifetime.

    Director:Dan Riba
    Writer:Geoffrey Thorne

    Be the first to start the conversation for this episode

  3. Ben 10: Ultimate Alien Season 1 Episode 16 - The Forge of Creation
    9.3/10(1213 votes)

    #3 - The Forge of Creation

    S1:E16

    As the team makes its final attempt to stop Aggregor, they find an unexpected ally, and one person will make a fateful decision with lasting repercussions.

    Director:Dan Riba
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  4. Ben 10: Ultimate Alien Season 2 Episode 9 - It's Not Easy Being Gwen
    9.0/10(1130 votes)

    #4 - It's Not Easy Being Gwen

    S2:E9

    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.

    Director:Matt Youngberg
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  5. Ben 10: Ultimate Alien Season 2 Episode 27 - Catch a Falling Star
    9.0/10(6 votes)

    #5 - Catch a Falling Star

    S2:E27

    Movie starlet Jennifer Nocturne is recaptured by the evil Captain Nemesis!

    Director:Butch Lukic
    Writer:Len Uhley

    Be the first to start the conversation for this episode

  6. Ben 10: Ultimate Alien Season 1 Episode 15 - Perplexhahedron
    8.8/10(896 votes)

    #6 - Perplexhahedron

    S1:E15

    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.

    Director:Matt Youngberg
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

    7. Trending NowTRENDING NOW

    The 20 WORST Episodes of Ben 10: Ultimate Alien

    READ
  7. Ben 10: Ultimate Alien Season 1 Episode 20 - Absolute Power (2)
    8.8/10(757 votes)

    #7 - Absolute Power (2)

    S1:E20

    Final confrontation with Kevin. While Gwen makes a last ditch effort to save Kevin, Ben fights an all out battle with Kevin.

    Director:Dan Riba
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  8. Ben 10: Ultimate Alien Season 2 Episode 10 - Ben 10,000 Returns
    8.8/10(768 votes)

    #8 - Ben 10,000 Returns

    S2:E10

    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.

    Director:Matt Youngberg
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  9. Ben 10: Ultimate Alien Season 2 Episode 23 - Solitary Alignment
    8.8/10(6 votes)

    #9 - Solitary Alignment

    S2:E23

    Azmuth reveals the origin of the sword and how he first encountered Old George. Ben comes to a decision on how to handle the Daigon.

    Director:Matt Youngberg
    Writer:Peter David

    Be the first to start the conversation for this episode

  10. Ben 10: Ultimate Alien Season 1 Episode 11 - Map of Infinity
    8.7/10(664 votes)

    #10 - Map of Infinity

    S1:E11

    Aggregor has absorbed all the powers of his captured aliens. Now he's after the Map of Infinity.

    Director:Matt Youngberg
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  11. Ben 10: Ultimate Alien Season 1 Episode 19 - Absolute Power (1)
    8.7/10(716 votes)

    #11 - Absolute Power (1)

    S1:E19

    Kevin starts going after Plumbers kids to gain more power. Ben and Gwen continue to argue about how to handle the situation. Gwen tries to find someone who will help her cure Kevin.

    Director:Dan Riba
    Writers:Charlotte Fullerton, Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  12. Ben 10: Ultimate Alien Season 2 Episode 17 - Double or Nothing
    8.7/10(6 votes)

    #12 - Double or Nothing

    S2:E17

    Ben finds out there's a new show called 'Ben 10: Live." He finds an old enemy running the show and cashing in on his fame.

    Director:Matt Youngberg
    Writers:Len Uhley, Joe Casey, Duncan Rouleau

    Be the first to start the conversation for this episode

  13. Ben 10: Ultimate Alien Season 2 Episode 24 - Inspector #13
    8.7/10(6 votes)

    #13 - Inspector #13

    S2:E24

    A Techadon weapon master comes to Earth and wants the Ultimatrix.

    Director:Butch Lukic
    Writer:Geoffrey Thorne

    Be the first to start the conversation for this episode

  14. Ben 10: Ultimate Alien Season 2 Episode 16 - The Flame Keeper's Circle
    8.5/10(6 votes)

    #14 - The Flame Keeper's Circle

    S2:E16

    Julie gets Ben to visit a charity organization who wants to improve the world with alien technology. Ben soon discovers the charity's benefactor is an old enemy.

    Director:Dan Riba
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  15. Ben 10: Ultimate Alien Season 2 Episode 19 - The Ultimate Sacrifice
    8.5/10(6 votes)

    #15 - The Ultimate Sacrifice

    S2:E19

    Ben's Ultimate transformations have developed their own personalities. Now they want their freedom from Ben.

    Director:Butch Lukic
    Writers:Joe Casey, Joe Kelly, J. M. DeMatteis

    Be the first to start the conversation for this episode

  16. Ben 10: Ultimate Alien Season 2 Episode 31 - The Ultimate Enemy (1)
    8.5/10(6 votes)

    #16 - The Ultimate Enemy (1)

    S2:E31

    Dagon is getting closer and closer to entering our dimension thanks to an old foe.

    Director:Matt Youngberg
    Writer:Matt Wayne

    Be the first to start the conversation for this episode

  17. Ben 10: Ultimate Alien Season 2 Episode 32 - The Ultimate Enemy (2)
    8.5/10(6 votes)

    #17 - The Ultimate Enemy (2)

    S2:E32

    Vilgax re-emerges in his most powerful form ever! Can Ben stop him and save the universe?

    Director:Dan Riba
    Writer:Dwayne McDuffie

    Be the first to start the conversation for this episode

  18. Ben 10: Ultimate Alien Season 1 Episode 5 - Escape from Aggregor
    8.4/10(647 votes)

    #18 - Escape from Aggregor

    S1:E5

    The team encounters another alien who escaped from Aggregor and, through him, learns more about Aggregor's goals.

    Director:Butch Lukic
    Writers:Charlotte Fullerton, Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  19. Ben 10: Ultimate Alien Season 1 Episode 10 - Ultimate Aggregor
    8.4/10(631 votes)

    #19 - Ultimate Aggregor

    S1:E10

    Aggregor has all five aliens. The Plumbers manage to disable Aggregor's ship, forcing Aggregor to find a new way to absorb their powers. The team makes a last ditch effort to save the alien prisoners.

    Director:Matt Youngberg
    Writers:Joe Casey, Matt Youngberg, Joe Kelly

    Be the first to start the conversation for this episode

  20. Ben 10: Ultimate Alien Season 1 Episode 14 - Where the Magic Happens
    8.3/10(642 votes)

    #20 - Where the Magic Happens

    S1:E14

    Aggregor escapes to a magical dimension. Gwen asks for Charmcaster's help to pursue him. The team learns about Charmcaster's past and why she's willing to help them now.

    Director:Butch Lukic
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  21. Ben 10: Ultimate Alien Season 2 Episode 12 - Prisoner #775 Is Missing
    8.3/10(592 votes)

    #21 - Prisoner #775 Is Missing

    S2:E12

    After a base is attacked, Max is infuriated when they learn it was a secret alien prison facility. While Max argues with the officer in charge, the team tries to locate an escaped prisoner.

    Director:Dan Riba
    Writers:Peter David, Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  22. Ben 10: Ultimate Alien Season 2 Episode 13 - The Purge
    8.3/10(6 votes)

    #22 - The Purge

    S2:E13

    Old George, the original Forever Knight, reclaims his position, and orders the Knights to remove all aliens on Earth.

    Director:Butch Lukic
    Writers:Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  23. Ben 10: Ultimate Alien Season 2 Episode 15 - Greetings from Techadon
    8.3/10(6 votes)

    #23 - Greetings from Techadon

    S2:E15

    Ben faces Tecadon killer robots that have been programmed to kill him. Each robot is more powerful than the last one. Ben's only chance to survive is for Gwen to find out who commissioned the robots.

    Director:Dan Riba
    Writers:Charlotte Fullerton, Joe Casey, Joe Kelly

    Be the first to start the conversation for this episode

  24. Ben 10: Ultimate Alien Season 2 Episode 30 - The Beginning of the End
    8.3/10(6 votes)

    #24 - The Beginning of the End

    S2:E30

    The final battle between the Forever Knights and Dagon's Esoterica is in full swing, with Ben caught in the middle!

    Director:Butch Lukic
    Writers:Charlotte Fullerton, Eugene Son

    Be the first to start the conversation for this episode

  25. Ben 10: Ultimate Alien Season 1 Episode 8 - Fused
    8.2/10(602 votes)

    #25 - Fused

    S1:E8

    Ra'ad, the last of Aggregor's escaped prisoners, attacks Ben and informs the team of the true fate of his comrades. He finds a safe hiding place but one that endangers Ben in the process.

    Director:Dan Riba
    Writers:Len Uhley, Joe Casey, Duncan Rouleau

    Be the first to start the conversation for this episode

Best Episodes Summary

"The Enemy of My Frenemy" is the best rated episode of "Ben 10: Ultimate Alien". It scored 9.4/10 based on 5 votes. Directed by Matt Youngberg and written by Brian Swenlin, David McDermott, it aired on 2/11/2012. This episode scored 0.0 points higher than the second highest rated, "Couples Retreat".