Gwendolyn "Gwen" Tennyson, occasionally known as Lucky Girl, is a fictional character that appears in the Ben 10 franchise. The paternal first cousin and best friend of title protagonist Ben Tennyson, Gwen is a core member of Ben’s team who frequently aids him in his various adventures. A highly intelligent and a skilled martial artist, Gwen later develops magic abilities that are eventually revealed to be alien in nature.
