Gwendolyn "Gwen" Tennyson (voiced by Ashley Johnson) is a Human/Anodite hybrid Plumber, the paternal cousin of Ben Tennyson, and along with Kevin Levin and Rook Blonko a front line member of his team. Gwen was first introduced when her parents sent her on a summer-long road trip with her Grandpa Max and her cousin Ben. She has, as Verdona refers to it, "The Spark".