Future incarnation of Ben 10's Gwen Tennyson. Debuted in the original series, appearing in the third season episode "Ben 10,000", and would later reappear in the fourth season episode "Ken 10", and last appeared in the Omniverse episode "The End of an Era".
She is introduced in "Ben 10,000" as a hooded sorceress who appeared before Ben and Gwen Tennyson, and took them both to a far-flung future where aliens co-exists with mankind, and Ben became a celebrity hero with complete mastery over the Omnitrix and its (at the time) unlocked 10,000 alien forms. In this future, Gwen mastered the many mythical arts of Bezel and all of its secrets, now taking up her full name of "Gwendolyn Tennyson" as she protects the rest of the world in Ben's place whenever he's off-world doing his hero business.
In the episode "Ben 10,000", Gwendolyn had shortred hair styled into a pixie cut. She wore a blue and blackspandex suit with black combat boots and the "Charms of Bezel" on her right arm. She had a hood and only sometimes wore it. She had a belt with a cat logo on it, the same cat logo Gwen wore on her shirt when she was young.
In the episode "Ken 10" meanwhile, Gwendolyn had much longer hair, tied back in a high ponytail and her black combat boots are now high heels.
