Ben Tennyson's summer starts off with a real blast when the OMNITRIX is accidentally set to self-destruct. With the help of a new alien, Way Big, he goes head-to-head against evil Vilgax to save the galaxy. Ben and his family continue their vacation only to stumble upon more action and new heroes like the mega-multiplier Ditto. As the summer winds down, it's time for Ben to go back to school. Will he reveal his secret to his parents and classmates?