Gwen tennyson

Gwendolyn Tennyson also known as 'Gwen', is Ben's paternal first-cousin and a main character in every series. Gwen was first introduced in the episode "And Then There Were 10", when her parents send her on a summer-long road trip with her Grandpa Maxand her cousin Ben. She is a Human/Anodite hybrid, but unlike herfather, uncle, brother or cousin (with the exception of her other cousin). She has, as her Grandmother refers to it, "The Spark". Gwen has appeared in every single episode except for the episode"Above and Beyond".