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".
Ben 10: Ultimate Alien is the most recent series in the Ben 10 television series’, having ended in March of 2012. Featuring a 16 year old Ben Tennyson, the series sees Ben with an improved Omnitrix, called the Ultimatrix, as well as becoming known worldwide for his power and abilities. Becoming known for being a superhero has it’s downsides though as Ben continues to face bigger threats, but also gains the ability to use improved Ultimate forms of some of his alien forms.