ストリートファイターIV
Bison returns in "Street Fighter IV", set between "Street Fighter II" and "Street Fighter III". The "Street Fighter IV Training Guide" reveals that Bison was destroyed by Akuma's Shun Goku Satsu and now inhabits a new body created for him by his scientists. Unlike his previous bodies, this one is capable of withstanding the full strength of his Psycho Power. In "Street Fighter IV", the main villain is Seth, an android previously created for Bison's soul to inhabit but went rogue and usurped the leadership of S.I.N., a subsidiary of Shadaloo. It is later revealed, however, that Bison is actually the true mastermind behind the game's events, and was secretly manipulating Seth to further his own agendas before revealing himself again. Ryu eventually destroys Seth once and for all, unknowingly allowing Bison to retake control of Shadaloo. Bison also appears in the sequels/updates, "Super Street Fighter IV" and "Ultra Street Fighter IV".