<P> The series follows the events of the feature film Big Hero 6 and continues the adventures of 14 - year - old tech genius Hiro Hamada and the compassionate, cutting - edge robot Baymax created by his late brother Tadashi . Along with his friends Wasabi, Honey Lemon, Go Go and Fred, they form the superhero team Big Hero 6 and embark on high - tech adventures as they protect their city from an array of scientifically enhanced villains . Hiro also faces academic challenges and social trials as the new prodigy at San Fransokyo Institute of Technology (SFIT). </P> <Ul> <Li> Ryan Potter as Hiro Hamada, a 14 - year - old robotics prodigy whose brother Tadashi Hamada was killed in an explosion at the San Fransokyo Institute of Technology (SFIT) and member of Big Hero 6 . </Li> <Li> Scott Adsit as Baymax, an inflatable robot originally built by Tadashi as a medical assistant, but reprogrammed by Hiro to also use martial arts and member of Big Hero 6 . </Li> <Li> Jamie Chung as GoGo Tomago, a tough, athletic student at SFIT who specializes in electromagnetics and member of Big Hero 6 . </Li> <Li> Genesis Rodriguez as Honey Lemon, a student at SFIT and chemistry enthusiast and member of Big Hero 6 </Li> <Li> Khary Payton as Wasabi, a smart, slightly neurotic student at SFIT who specializes in lasers and member of Big Hero 6 . </Li> <Li> Brooks Wheelan as Fred, a comic book fan who is also team mascot at SFIT and member of Big Hero 6 . </Li> <Li> Maya Rudolph as Aunt Cass, Hiro's aunt and guardian . </Li> <Li> David Shaughnessy as Heathcliff, Fred's family butler . </Li> <Li> Alan Tudyk as Alistair Krei, a pioneer entrepreneur and CEO of Krei Tech . </Li> <Li> Paul Briggs as Mr. Yama, a notorious gangster working under Obake and Hiro's arch - nemesis . </Li> <Li> Stan Lee as Frederick Frederickson III, Fred's Dad and a former superhero . </Li> <Li> Daniel Henney as Tadashi Hamada, Hiro's older brother who built Baymax and was killed by Professor Callaghan who started a fire and let him die . He appears as a recording in "Baymax Returns". </Li> </Ul> <Li> Ryan Potter as Hiro Hamada, a 14 - year - old robotics prodigy whose brother Tadashi Hamada was killed in an explosion at the San Fransokyo Institute of Technology (SFIT) and member of Big Hero 6 . </Li> <Li> Scott Adsit as Baymax, an inflatable robot originally built by Tadashi as a medical assistant, but reprogrammed by Hiro to also use martial arts and member of Big Hero 6 . </Li>

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