When Ben was in a fight with Vilgax, in a prototype genetic modifer ( so vilgax could build an Omnitrix ) ben's dna got scrambled and he became a girl.

He unlocks Genbig ( who is a blue female version of way big ), Boogeygirl ( who is bogeyman when he is ben ) and several others.

He then becomes Ben again ( through a cure made by Grandpa Max) but he can become Gen again at any moment. Vilgax did not get the omnitrix.

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