 The contents depicted in this article belong to the real world and not any continuity.
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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.