<Li> Daniel Henney as Tadashi Hamada, Hiro's older brother who built Baymax and was killed by Professor Callaghan . He appears as a recording in "Baymax Returns" and "Failure Mode". </Li> <Li> James Cromwell as Yokai / Professor Robert Callaghan, the former head of SFIT turned criminal . </Li> <Ul> <Li> Jenifer Lewis as Professor Granville, the new head of the robotics program at SFIT . A stern woman who despises procrastination and deep down sees potential in Hiro . </Li> <Li> Andrew Scott as Obake, a mysterious villain . </Li> <Li> Andy Richter as Globby / Dibbs, a pathetic thief who steals Honey Lemon's chem purse with an experimental neurotransmitter and that transforms him into a slime monster . </Li> <Li> Diedrich Bader as Bluff Dunder, a news reporter for San Fransokyo . Known for his somewhat pompous delivery . <Ul> <Li> Bader also voices Felony Carl, a recurring minor criminal . </Li> </Ul> </Li> <Li> Susan Sullivan as Mrs. Frederickson, Fred's wealthy socialite mother who is embarrassed by her son's antics . </Li> <Li> Sean Giambrone as Richardson Mole, an eleven year old fanboy and Fred's arch - rival . He has an open crush on Go Go . </Li> <Li> John Ross Bowie as Mel </Li> <Li> Haley Tju as Karmi, a biology student at SFIT who is jealous of Hiro, but is in love with his alter ego . </Li> <Li> Jeff Bennett as Baron Von Steamer, a steampunk based villain and arch - enemy of Boss Awesome . </Li> <Li> Katy Mixon as Barb, the mother of Juniper and part of the electricity powered duo High Voltage . </Li> <Li> Sophie Reynolds as Juniper, the daughter of Barb and part of the electricity powered duo High Voltage . </Li> <Li> Naoko Mori as Momakase, a professional thief and chef who uses cooking blades as weapons . </Li> <Li> Gordon Ramsay as Bolton Gramersi, an arrogant chef and Cass' rival . </Li> <Li> Alton Brown as Yum Labouché, a famous chef and judge in the underground </Li> <Li> John Michael Higgins as Mini-Max, Fred's robot sidekick . </Li> <Li> Lucas Neff as Noodle Burger Boy, the fast food mascot of Noodle Burger . </Li> <Li> Mara Wilson as Liv Amara, a self made millionaire . </Li> </Ul> <Li> Jenifer Lewis as Professor Granville, the new head of the robotics program at SFIT . A stern woman who despises procrastination and deep down sees potential in Hiro . </Li>

Big hero 6 the series season 1 episode