The following day, Yokai intercepts Krei's latest ceremony, immediately capturing the tech-geru before revealing his true identity. Krei is briefly taken aback by Callaghan's appearance, having believed him to be dead, but his confusion is quickly replaced by pure fear as Callaghan confronts his nemesis on his daughter's demise, blaming Krei for the preventable tragedy, and announcing his plot to use the newly rebuilt Silent Sparrow portal to destroy all Krei has ever built, before killing Krei, himself. Krei pleads for mercy, but with Callaghan's mind set, the portal is activated, being held high above Krei's building by the Microbots. Just then, Hiro arrives alongside his teammates and confronts the former professor, demanding he call off his plot as Abigail wouldn't approve. When Callaghan argues against such claims, Hiro continues, explaining that revenge is a hollow victory, specifically with loss, having learned such a lesson through personal experience. Realizing what Hiro says may be true, Callaghan falls into a state of moral thought, only to be drawn back into a murderous state once Krei makes a sleazy attempt to escape the situation, igniting a deadly battle against Yokai and the Big Hero 6 team.