Board Thread:Questions and Answers/@comment-24684402-20140422152354/@comment-34326521-20140712195414

Omnitrix88 wrote: That is kind of a mystery in the series. Can someone explain that to me please? Usually, in series that involve aliens and humans, humans are portrayed as being able to reproduce with virtually any sentient species in the Universe. Ben 10,000's Ultimate Ben form is simply the culmination of that portrayal.