Ben 10: Ultimate Alien All Episodes

Ben 10: Ultimate Alien All Episodes – A Complete Guide to the 2010 Sci-Fi Sequel

When Ben 10: Alien Force ended on a cliffhanger, fans were hungry for more high-stakes action, darker narratives, and new transformations. Enter Ben 10: Ultimate Alien, the third installment in the original Ben 10 franchise, which aired from April 2010 to March 2012. For anyone searching for a definitive resource on Ben 10: Ultimate Alien all episodes, you have come to the right place. Below, we break down every season, major arc, and essential episode you need to watch.

Episodes 41–46: The Dagon Ascendant

  1. The Ultimate Enemy (Parts 1 & 2) – Vilgax absorbs Dagon’s power, becoming an eldritch god. He easily defeats Sir George and even overpowers Ultimate Alien X.
  2. A Fistful of Brains – Dr. Psychobos (creator of the Nemetrix) debuts. First hints at Omniverse lore.
  3. For a Few Brains More – Team Ben tries to restore the minds of the galaxy’s smartest beings.
  4. The Night of the Living Nightmare – A hallucinatory episode inside Ben’s subconscious. Surreal and dark.
  5. The Beginning of the End – The final buildup. All villains unite under Vilgax.

Episodes 27–32: Rise of Dagon

  1. The Mother of All Vreedles – Comedy episode featuring the bumbling Vreedle brothers and their terrifying mother.
  2. A Knight to Remember – Sir George, the immortal founder of the “Forever Knights,” is introduced. He wields Ascalon, a powerful sword.
  3. Solitary Alignment – Gwen’s mana manipulation is pushed to its limits.
  4. Inspector 13 – The Inspector tries to reverse-engineer the Ultimatrix. Ben unlocks Ultimate Rath.
  5. The Enemy of My Frenemy – Vilgax returns, manipulating both Ben and Sir George.
  6. Couples Retreat – Ben, Julie, Gwen, Kevin, and even Vilgax get caught in a romantic entanglement episode... with explosions.

Episodes 16–20: The Kevin Arc

  1. …Nor Iron Bars a Cage – Kevin, now insane and power-hungry, wreaks havoc.
  2. The Enemy of My Enemy – Ben reluctantly teams up with Aggregor to stop Kevin.
  3. Absolute Power (Parts 1 & 2) – Ben contemplates killing Kevin to save innocents. Gwen refuses to give up on him. A dark, emotional climax where Ben drains Kevin’s powers back into the Ultimatrix.
  4. The Transmogrification of Eunice – A standalone episode introducing a “sister unit” to the Omnitrix, Eunice.
  5. Ben 10,000 Returns – A fan-favorite time-travel episode featuring the older, grizzled Ben 10,000 and his son, Ken.

Season 2 (2011)

  1. ...Nor Iron Bars a Cage – Ben tries to cure the mutated Kevin.
  2. The Enemy of My Enemy – Argit becomes the target of the mutated Kevin.
  3. Absolute Power: Part 1 – Ben resolves to destroy Kevin to stop him.
  4. Absolute Power: Part 2 – The climactic battle between Ben and Kevin.
  5. The Transmogrification of Eunice – Ben meets a Unitrix (a prototype Omnitrix).
  6. Eye of the Beholder – Ben helps an alien artist (Galante).
  7. Viktor: The Spoils – Dr. Viktor returns in a new robotic body.
  8. The Big Story – Jimmy Jones (kid reporter) discovers a Clone conspiracy.
  9. Girl Trouble – Sunny (Gwen's cousin) and Antonio arrive.
  10. Revenge of the Swarm – A sequel to Alien Force's "Voided" involving Dr. Animo.
  11. The Creature From Beyond – Introduction of the Lucubra entity.
  12. Basic Training – Ben and Gwen attend the Plumbers' Academy.
  13. It's Not Easy Being Gwen – A slice-of-life episode focusing on Gwen's stress.
  14. Ben 10,000 Returns – Future Ben returns to warn of a coming threat.