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Gwendolyn Tennyson is the future version of Gwen Tennyson.
Gwendolyn has short orange hair that has bangs in the front. She wears a blue and black spandex suit 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 on it, with pointy ears and pink eyes. Her shoes have white toes and outsoles. She also has freckles and blue earrings.
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In The End of an Era, she attends Max's retirement party alongside Kevin. When the power goes out, she helps the other guests evacuate. She helps Ben and Kai battle Maltruant, but ends up being temporarily frozen in time.
Ben 10: Omniverse
- The End of an Era (first reappearance)