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"Vilgax" may be referring to two or more different villains. If you're uncertain which one you're looking for, just flip a coin. If you came here from a link, please go back and make the right link for one of the villains listed below.
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Vilgax is the main antagonist of the Ben 10 franchise. He is the arch-nemesis of both Ben Tennyson and his grandfather Max Tennyson.
There are several versions of this villain: