Scott Adsit Baymax (voice) Ryan Potter Hiro Hamada (voice) Daniel Henney Tadashi Hamada (voice) T.J. Miller Fred (voice) Jamie Chung GoGo Tomago (voice) Damon Wayans Jr. Wasabi (voice) Genesis Rodriguez Honey Lemon (voice) James Cromwell Professor Robert Callaghan (voice) Alan Tudyk Alistair Krei (voice) Maya Rudolph Aunt Cass (voice) Abraham Benrubi General (voice) Katie Lowes Abigail (voice) Billy Bush Newscaster (voice) Daniel Gerson Desk Sergeant (voice) Paul Briggs Yama (voice) Charlie Adler Yokai (voice) Marcella Lentz-Pope Additional Voices (voice) David Shaughnessy Heathcliff (voice) Cam Clarke Additional Voice (voice) Nicholas Guest Additional Voice (voice) Terri Douglas Additional Voice (voice) Tim Mertens Additional Voice (voice) Yuri Lowenthal Additional Voice (voice) Sundra Oakley Additional Voice (voice) Brian R. Norris Additional Voice (voice) Stan Lee Fred's Dad (voice) Shane Sweet Additional Voice (voice) Frank Welker Mochi (voice) (uncredited) David Cowgill Additional Voice (voice) Kirk Baily Additional Voice (voice) Charlotte Gulezian Ringleader (voice) Reed Buck Additional Voice (voice) Roy Conli Additional Voice (voice) Jackie Gonneau Additional Voice (voice) Marlie Crisafulli Additional Voice (voice) Bridget Hoffman Additional Voice (voice) Kelly Hoover Additional Voice (voice) James Taku Leung Additional Voice (voice) Yumi Mizui Additional Voice (voice) Michael Powers Additional Voice (voice) Josie Trinidad Additional Voice (voice) Daniel Howell Male Technician #1 (voice) (uncredited) June Christopher Additional Voices (voice) Phil Lester Male Technician #1 (voice) (uncredited)