
When Hiro's kindhearted brother, Tadashi, vanishes through a portal to save him, the boy genius is devastated. But his big brother left something to help Hiro cope with his loss--a personal health-care robot named Baymax. And when what Hiro needs more than comfort is an explanation...

After his brother vanishes in order to save him, Hiro, with the help of new friends and his health-care robot, tries to get to the bottom of what happened to his sibling.