Gwen Tennyson (Ben 10: Alien Force)

Gwen Tennyson is the paternal cousin of Ben Tennyson. She helps Ben fight alien treats, often being the brain of the team, After stopping an alien invasion, Ben and Gwen comes to Gwen's place to crash, Gwen's boyfriend Kevin didn't stay and left to fix his car, when Gwen and Ben go inside the house they find themselves alone since Gwen's parents has gone on a trip, The cousin's a all alone.