Gwen Tennyson (voiced by Meagan Smith and Ashley Johnson) is the cousin of Ben Tennyson.
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- Gwen will meet Jeffrey, Jaden and the team in Jeffrey, Jaden & Friends meet Ben 10.
- Gwen will meet Twilight and her friends in Twilight Sparkle meets Ben 10.
- Gwen will reunite with Twilight and her friends in Twilight's Adventures of Ben 10: Alien Force.
- Aqua acts as a mentor to Gwen once she learns how to use magic.
- Princess Twilight will also act as a teacher to Gwen when it comes to learning of using magic and casting spells.