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Monsters Unleashed! is the twenty-second episode of Ben 10: Ultimate Alien.

Air Date

December 10, 2010

Plot

Dr. Animo is back and he and a new Villain named The Spawner, to creat an Army of Mutant monsters, And Ben and Alan will have to stop this plan.

Characters

  • Ben Tennyson
  • Gwen Tennyson
  • Kevin Levin
  • Julie Yamamoto
  • Elena Validus
  • Alan Albright
  • Cooper Daniels (now happy that he is 17 years old now and muscle-bound now)
  • Helen Wheels
  • Manny Armstrong
  • Pierce
  • Mariella
  • Kai Green

Villains

  • Dr. Animo
  • The Spawner (a new villain who creats monsters)
  • Nanotron (a new villain who controls monsters with nanobots)
  • Forever Knights
  • Argit (cameo)

Aliens Used

  • Eye Guy
  • Jetray
  • Wildvine
  • Upchuck
  • Benmummy
  • Humongousaur
  • Nanomech

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