Chun-Li is attacked by mysterious mutant assailants, as well as having her TV crew kidnapped. She calls for Guile and Blanka's help to track them down, which leads to a search of the sewers. They soon find out that a former scientist of Bison's is continuing mutant research and mutated 3 thugs into half-man/half eel/alligator/bat warriors. In the ensuing battle, Blanka receives a mega-dose of mutagen ooze, which turns him even more feral.