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Gwendolyn "Gwen" Tennyson is a Human/Anodite hybrid Plumber, the paternal first-cousin of Ben Tennyson, and (along with Kevin Levin) a frontline member of his team. Gwen was first introduced when her parents send her on a summer-long road trip with her Grandpa Max and her cousin Ben. She has, as her grandmother Verdona refers to it, "The Spark".
Kevin Ethan Levin Ben 10 Ultimate Alien http://ben10.wikia.com/wiki/Kevin_Ethan_Levin#Matter_Absorption