Gwendolyn "Gwen" Tennyson is a Human/Anoditehybrid 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 Verdona refers to it, "The Spark".