So apparently in the Ben 10 wiki, there are things call “Evolved Humans”, which I have never heard about before . And that it's listed that Ultimate Ben and this random sheriff
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Ben 10: Alien Force (TV Series 2008–2010) - IMDb
Ben 10: Alien Force, Ben 10 Wiki
I know ben 10 returns makes sense in universe. Though in the real world there was a 3 day gap between the end of the orginal series and the premire of alien
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Ben Tennyson (Canon, Original)/AkiraAkabane10, Character Stats and Profiles Wiki
Ben 10: Alien Force — Википедия
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Ben 10: Alien Force Episodes, Ben 10 Wiki
Ben 10: Alien Force, Ben 10 Wiki