Complete story — includes the ending
Ben learns from Grandpa Max that the exposure of Ben's identity has caused various old enemies of his to crawl out of the woodwork, seeking revenge by targeting Ben's loved ones. Ben, Gwen, and Kevin trail Ben's father Carl, intercepting a team of villains consisting of Charmcaster, Vulkanus, and Zombozo. The team succeeds in protecting Carl and split up to protect Ben's family, but Gwen is ambushed by Charmcaster, resulting in Ben's mother Sandra being captured. The team tracks Zombozo to a nearby circus, where Kevin defeats Charmcaster and Ben defeats Vulkanus. Gwen is captured by Zombozo, but her fury prompts her to reawaken her Anodite form (one year since "War of the Worlds") and frightens Zombozo into fleeing, rescuing Sandra in the process. Ultimatrix alien debuts: Swampfire, Ultimate Big Chill
Sources and content license
Source and revision history · Adapted from Wikipedia contributors, List of Ben 10: Ultimate Alien episodes. HTML formatting and reference markers removed. · Content license