Real-world-icon copy 2 Real World: Characters/Events depicted in this article belong to the real world and not any continuity.
  • Alter Alien Echo Echo
  • Becoming Ultimate Echo Echo.
  • Ultimate Echo Echo.
  • Swampfire
  • Becoming Ultimate Swampfire
  • Ultimate Swampfire
  • Big Chill
  • Ultimate Big Chill
  • Spidermonkey
  • Becoming Ultimate Spidermonkey
  • Ultimate Spidermonkey
  • Humoungousaur
  • Becoming Ultimate Humungousaur
  • Ultimate Humoungousaur
  • Jetray
  • Becoming Armodrillo
  • Armodrillo
  • Alter Aliens Ben to Mystery Alien and Swampfire to Ultimate Swampfire in Box.
  • Alter Aliens Ben to Mystery Alien and Echo Echo to Ultimate Echo Echo in a box.
  • Alter Aliens Ben to Mystery Alien and Big Chill to Ultimate Big Chill in a box.

Alter Aliens are a subline of toys in the Ben 10: Ultimate Alien toyline. They are one alien and then switch over to an another alien. They come in two packs only.

They transform from one hero to another providing you with two characters in one. Each set comes with Ben transforming into a mystery alien and another favorite hero who transforms from one alien to another or into the alien's new Ultimate form.