Despite reservations from some members of the Giri, Silver Samurai, a freelance ronin and former bodyguard of the terrorist Viper, is appointed as the team's field commander.

Unimpressed with the Silver Samurai, Hiro refuses to join the team until his mother is kidnapped by the Everwraith, the astral embodiment of those killed in the bombings of Hiroshima and Nagasaki.

During the battle, Big Hero 6 is joined by Sunfire, Japan's premier superhero, a mutant with the ability to heat matter into plasma who helps them defeat the Everwraith.

After a brief battle, the mind-control device is short-circuited and the two teams part as friends, with Big Hero 6 returning to Japan to seek out those responsible for their mind control.

[volume & issue needed] During the "Ends of the Earth" storyline, Spider-Man calls upon Big Hero 6 to help him defeat Doctor Octopus.

[volume & issue needed] Silver Samurai later became the bodyguard of the Japanese prime minister, but was killed defending his family from a ninja attack.

[6] Sunfire (Shiro Yoshida) was a former member of the X-Men and a former nationalist who changed his views after the death of his father and possesses the ability to fly and generate super-heated blasts of plasma.

[9] GoGo Tomago (Leiko Tanaka) is a member of Big Hero 6 who possesses the ability to transform her body into an explosive ball of energy, which can be projected at high speeds.

[volume & issue needed] A member of Big Hero 6 who has the Power Purse, which allows her access to objects and other dimensions through wormholes.

Hiro Takachiho is a thirteen-year-old boy genius who created Baymax; after the departure of Silver Samurai and Sunfire, he becomes the leader of Big Hero 6.

[11] After learning that Silver Samurai had become the bodyguard of the Japanese prime minister, Kiochi abandoned his quest for revenge after realizing that killing him would be a betrayal of his country.

[12] A version of Sunfire's deceased sister Leyu from an alternate reality, Lumina is the crown princess of Coronar, a planet hidden deep within the Microverse.

As a result of being pulled out of the Microverse through Honey Lemon's purse, Sunpyre worships her as a goddess and joins Big Hero 6 out of gratitude.

[20] Produced by Walt Disney Animation Studios,[21] it retains some of the core themes and character concepts from the comics, but makes changes and builds a new story around them.