The series is structured into three primary narrative arcs, each escalating in maturity and scale:
Ben, Gwen, and Kevin face an ancient eldritch being called Dagon and a revitalized Vilgax, who seek to conquer reality using the power of the Forever Knights' mythical sword, Ascalon. Ben 10: Ultimate Alien
Following the battle with Aggregor, Kevin Levin mutates into a monstrous form after absorbing the Ultimatrix's energy, forcing Ben to make a dark choice about whether he must kill his best friend to save the world. The series is structured into three primary narrative