This article is about Gwen's brother and Ben's cousin. For Been and Kai Green's son, see Ken Tennyson (Ken 10).
Ken "Kenny" Tennyson is a supporting character in Ben 10: Alien Force. He is Gwen's older brother, and Frank and Natalie Tennyson's son.
Unlike his sister's relationship with Gwen, Ken and Ben were closer to the point where it was brotherly more than cousinly. Ben practically hero-worshipped him since he was ten.
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Ken drives an old Junker car nicknamed the Awesome-mobile.
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Ben Tennyson[]
Ben looked up to Ken as a role model, and Ben practically "worshipped" his cousin when he was 10. Ken took Ben to his first soccer practice. Unlike typical cousins, Ben looked to him like a brother due to Ben being an only child and Ken only having a sister.