Legacies: Part 1.While fighting El Fuego, the Big Hero 6 are confronted by Buddy Guardians, giant robots created by Krei for Cruz. Hiro and Megan sneak into the SFPD station and steal a programming chip from one of the Guardians. Upon examining the data, Hiro learns that the chip has Obake's programming on it. Believing that Obake is back, Hiro tries to warn Cruz, but to no avail. Hiro and Baymax sneak into Krei's office and manage to learn where the Guardians are being made, but the rest of the team fall into a trap set up by Cruz and are caught. Hiro and Baymax find the warehouse and learn that Trina has created the Guardians to obliterate San Fransokyo and make it a haven for robots...