Ben 10: Alien Force (2008)

Five years down the line, 15-year-old Ben Tennyson decides to don the Omnitrix once more, only to find it has updated, granting him the ability to transform into ten new alien forms. Alongside his formidable cousin Gwen Tennyson and former foe Kevin Levin, Ben embarks on a quest to locate his missing Grandpa Max. To rescue him, they must confront the menacing DNAliens, a formidable alien race determined to annihilate the galaxy, with Earth as their first target. Adventure and danger await as Ben reclaims his hero role.