Duncan Rouleau isn't weighing out a story that would see Ben Tennyson and company in a far more mature setting.
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The Good Life, Book by Robert Waldinger, Marc Schulz, Official Publisher Page
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Ben 10 Could Easily Make an Adult Series, Says Creator
Ben 10, Free online games and video
Man of Action
7 Most Powerful Ben 10 Aliens - ReelRundown
When Ben 10 scans or transforms into an alien, is the alien just “average” or does it make Ben into the strongest version/form of that alien? - Quora
Ben 10: Ultimate Alien - Wikipedia