Baymax is a lovable personal companion robot, who forms a special bond with robotics prodigy Hiro Hamada. When a devastating turn of events catapults them into the midst of a dangerous plot unfolding in the streets of San Fransokyo, Hiro turns to Baymax and his diverse group of friends, adrenaline junkie Go Go Tomago, neatnik Wasabi, chemistry whiz Henry Lemon and fanboy Fred, who transform into a band of unlikely heroes.