Metamorphosis is the first season 2 episode of Ben 10: Ultimate Alien.

Air Date

February 18th, 2011


Two years ago, a 14-year old boy lost a game by Gorvan the Tetramand, but later, Max Tennyson arrived, gave him a Plumber's badge from his father, and quills grew from his body. Soon, the boy was strong and defeated Gorvan this time, and was named Pierce. 2 years later, Pierce drinks a soda, his powers greatly advances, poisons, and disfigures him seriously. Elena would help him in handy.


  • Ben Tennisen
  • Gwen Tennisen
  • Kevin E. Levin
  • Elena Validus
  • Alan Albright
  • Cooper Daniels
  • Helen Wheels
  • Manny Armstrong
  • Pierce (Main Character in this Episode)
  • Kai Green
  • Mariella


  • Slug (a new villain who lives in the sewers)
  • Gorvan (In flashback only)
  • Argit (cameo)

Aliens Used

  • Heatblast
  • Terraspin

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