Several weeks have passed since the events of the finale of the animated series Ben 10: Alien Force, in which Vilgax surrendered. Ben Tennyson turned 16. The Omnitrix was destroyed, and now he must master the secrets of the Ultimatrix - a new version of the Omnitrix that gives access to all past forms and abilities, and also allows him to develop stronger and more powerful versions of them, the so-called Perfect Forms (Ultimate).