Ben 10 Ultimate Alien Season 2 Episode 5 — "Girl Trouble"

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Family secrets and raw cosmic energy collide in a highly entertaining episode of Ben 10: Ultimate Alien. In Season 2 Episode 5, "Girl Trouble," the team's regular superhero duties get completely disrupted by the arrival of Gwen's seemingly ordinary, rebellious cousin, Sunny, who turns out to be carrying a dangerous biological legacy.

Sent by her parents to stay with Gwen in hopes of learning structure and manners, Sunny immediately stirs up tension within the group. While Ben, Gwen, and Kevin try to stop an escalating invasion of automated Techadon battle robots, they quickly discover that managing a reckless, power-tripping Anodite teenager is far more dangerous than fighting armor-clad machines.

“She looks just like you... She behaves nothing like me! ... I don't know, she's bossy, demanding, gets mad when she doesn't get her way—Ow! See? Just like you!”

Episode Summary

The episode begins with Gwen's mother dropping off Gwen's cousin, Sunny, for a summer visit. Sunny resembles Gwen exactly, except for a wardrobe change and a wildly rebellious, manipulative attitude. She instantly drives a wedge between the team, hitting on Kevin to irritate Gwen and mocking Ben's superhero status. Things get even more complicated when Sunny sneaks out to reveal her boyfriend, a hulking, brute alien criminal named Antonio.

Meanwhile, the group discovers that someone has ordered an assassination on Ben, sending advanced Techadon Robots that customize their tactics after every engagement. While Ben relies on heavy-hitters like NRG to smash the metal invaders, Sunny treats the life-or-death battles like a personal playground. When Gwen tries to rein her in, Sunny snaps, dropping her human skin to manifest her true, luminescent Anodite form, turning her immense magical power against her own family.

As Sunny and an enraged Antonio go on a destructive rampage, Ben transforms into Humungousaur and expands to full size to hold off Antonio. Gwen is forced to engage her cousin in a brutal, magic-fueled Anodite duel in the sky. Just as Sunny gains the upper hand, Grandma Verdona makes a surprise cosmic intervention, stripping away the teen's arrogance and demonstrating the true authority of a mature Anodite elder.

Themes & Character Development

The Burden of Heredity: The narrative highlights the dark side of Anodite heritage, contrasting Gwen's careful, disciplined control over her powers with Sunny's reckless indulgence in pure energy.
Teenage Rebellion and Entitlement: Sunny serves as a classic reflection of a spoiled, powerful teenager who believes her natural talents put her completely above rules, structure, and moral responsibility.
Family Hierarchies: The resolution reinforces that no matter how powerful Ben and Gwen become, they are still part of a massive galactic lineage governed by older, far wiser cosmic entities.

Production Details

First Aired: March 11, 2011
Created By: Man of Action (Duncan Rouleau, Joe Casey, Joe Kelly, and Steven T. Seagle)
Written By: Eugene Son
Directed By: Dan Riba
Produced By: Cartoon Network Studios
Art Style: Incorporates vivid pink and deep purple energy effects to distinguish the magical battles, maintaining the clean, sharp line work characteristic of the series.
Voice Cast:
- Yuri Lowenthal as Ben Tennyson / NRG
- Ashley Johnson as Gwen Tennyson / Sunny
- Greg Cipes as Kevin Levin
- Patrick Seitz as Antonio
- Barbara Bain as Verdona
- Dee Bradley Baker as Humungousaur / Techadon Robots

Fun Facts & Trivia

Did You Know?

Ashley Johnson pulls double duty in this episode, voicing both Gwen and her villainous cousin Sunny, utilizing a slightly more nasal, valley-girl vocal inflection for the latter.
Sunny's human design is an exact palette swap of Gwen's Alien Force design, swapping Gwen's orange hair and blue shirt for dark black hair and a bright pink top.
This episode marks the first time we see another full-blooded Anodite besides Verdona, confirming that the energy lifeforms can naturally experience mental instability and entitlement.
Unlike Gwen, who usually manipulates mana in the form of constructs, shields, and steps, Sunny prefers throwing raw, erratic bursts of energy, showing her complete lack of formal training.
At the end of the episode, Verdona takes both Sunny and Antonio back to her home planet of Anodyne to discipline them and keep them thoroughly grounded.

Legacy & Impact

"Girl Trouble" is highly valued by fans for diving back into the mystical, genetic lore established early in the franchise. It provided a fantastic contrast for Gwen's character, showing the audience what Gwen could easily become if she ever surrendered her humanity to her raw cosmic power.

By blending everyday family drama with explosive energy duels and the return of fan-favorite cosmic family members, the episode stands out as an incredibly fun and lore-heavy entry in Ben 10: Ultimate Alien.