Ben 10: Alien Force (2008)

It takes place five years after Ben 10 and takes a darker turn than its predecessor.

Ben 10: Alien Force (2008-2010) Review by JacobtheFoxReviewer on DeviantArt

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Ben 10: Alien Force (TV Series 2008–2010) - IMDb

At the end of alien force kevin seems to lose his need a lot of what he asorbs weakness. So the bag of stuff gwen gave him would be very useful.

Ben 10 - Alien Force - STARBURST Magazine

BEN 10: ALIEN FORCE, (from left): Gwen Tennyson, Ben Tennyson, Kevin Levin, 2008-10. © Cartoon Network / Courtesy: Everett Stock Photo - Alamy

Ben 10: Alien Force [2008] Season 1. 13 Episodes

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Ben 10: Alien Force (TV Series 2008–2010) - IMDb

Ben 10: Alien Force (2008) - Poster US - 632*814px

Ben 10 Alien Force Alien Creation Chamber Playset [Green]