Ben 10 Ultimate Alien Season 2 Episode 10 — "Prisoner Number 775 Is Missing"

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Political cover-ups, hidden military secrets, and a deeply tragic villain challenge the moral compass of our heroes in Ben 10: Ultimate Alien. In Season 2 Episode 10, "Prisoner Number 775 Is Missing," the team uncovers the dark underbelly of Earth's military operations when the secretive Area 51 base is targeted and completely uprooted by an enigmatic force.

Investigating the vanishing military facility on behalf of the Plumbers, Ben, Gwen, and Kevin find out that the site hid a secret, undocumented alien prison run by the government. The breakout frees an invisible, highly vengeful extra-terrestrial insurgent who will stop at nothing to assassinate the human colonel responsible for ruining his life and keeping him locked away in a cell for decades.

“Fifty years! Locked away in the dark, and for what?! I didn't break your laws, I didn't attack your planet! I just crashed here! ... I was keeping Earth safe! ... You kept yourself safe! You broke him, Colonel!”

Episode Summary

The episode begins with the team being summoned to the desert wasteland where the legendary military base Area 51 used to stand. The immortal founder of the Forever Knights, Old George, has utilized a mystical blade to cleanly carve the entire facility out of the ground, leaving a massive crater behind. Air Force Colonel Rozum arrives on site, initially trying to cover up the true nature of the facility. However, Kevin's scanners reveal a hidden, subterranean layer that housed an illegal, off-the-books containment block designed for extra-terrestrial lifeforms.

The group learns that during the chaotic evacuation, a single high-security inmate known only as Prisoner Number 775 escaped into the desert. The creature belongs to the Merlinisapien species, possessing advanced camouflage abilities that render it completely invisible to the naked eye. Driven completely mad by fifty years of solitary confinement, the alien steals a Plumber weapon ship and tracks down Colonel Rozum's private residence, planning to kidnap and murder the officer's family to make him feel the exact same pain of losing his kin.

Ben, Gwen, and Kevin ambush the invisible predator before he can execute the family. Ben cycles through high-tracking alien forms, turning into Wildmutt to sniff out the creature's location and shifting into Fasttrack to match its extreme agility. When the invisible alien proves too slippery, Ben pushes the watch to its limits, activating Ultimate Wildmutt to overpower the rogue fighter. The battle ends on a bittersweet, heartbreaking note as the alien breaks down in tears, begging Ben to end his life because his home world and family have completely turned to dust over the half-century he spent locked away.

Themes & Character Development

The Moral Grey of National Security: The narrative pulls no punches in criticizing human military overreach. Colonel Rozum acts as a dark reflection of institutional cruelty, treating a sentient refugee like a piece of hazardous equipment.
Vengeance and Loss: Prisoner 775 is depicted not as a traditional monster seeking galactic conquest, but as a deeply traumatized victim of indefinite detention whose rage stems from pure, agonizing grief.
The Burden of Justice: Ben is placed in a difficult position, forced to defend a corrupt military officer while actively acknowledging that the alien trying to kill him was completely wronged by Earth's governments.

Production Details

First Aired: April 29, 2011
Created By: Man of Action (Duncan Rouleau, Joe Casey, Joe Kelly, and Steven T. Seagle)
Written By: Dwayne McDuffie
Directed By: Dan Riba
Produced By: Cartoon Network Studios
Art Style: Showcases vast, barren desert dunes and clean, high-tech suburbs, utilizing excellent lighting and dust particle effects to track the movements of the invisible antagonist.
Voice Cast:
- Yuri Lowenthal as Ben Tennyson / Fasttrack
- Dee Bradley Baker as Prisoner 775 / Wildmutt / Ultimate Wildmutt
- John DiMaggio as Colonel Rozum
- Ashley Johnson as Gwen Tennyson
- Greg Cipes as Kevin Levin

Fun Facts & Trivia

Did You Know?

This episode serves as the spectacular animated debut for Ultimate Wildmutt, who sports a larger red coat, a tail, and the unique biological ability to speak English.
By scanning the rogue Merlinisapien prisoner into the Ultimatrix database, Ben permanently unlocks a brand-new camouflage alien transformation named ChamAlien.
The late, legendary writer Dwayne McDuffie structured this episode as a profound, serious commentary on the real-world issues surrounding military black sites and human rights.
This marks the historic first chronological appearance of Old George in the main animated timeline, laying down critical foundations for the upcoming Dagon and Forever Knights arc.
At the conclusion of the episode, a furious Ben openly reprimands Colonel Rozum, warning him that he will report his illegal prison operation to the global Plumber high command.

Legacy & Impact

"Prisoner Number 775 Is Missing" is universally celebrated by the fandom as one of the absolute greatest, most mature, and emotionally powerful episodes of the entire *Ultimate Alien* series. It took a massive risk by presenting an antagonist whose tragic motives were completely justified, forcing the audience to question who the true villain of the story was.

By blending high-stakes invisible action with a profound, tear-jerking breakdown of institutional injustice, the episode cemented its place as a legendary, narrative masterpiece in the legacy of Ben 10: Ultimate Alien.