After defeating Vega, Ken receives a call from one of Bison's men informing him that his girlfriend has been taken hostage by the Shadaloo. Ryu is still hurt from the previous attack, but they realize they have to go save the girl. This is when Bison emerges onto the scene..
lyrics
An old man once told me 'never go into the darkness', I been feelin it lately like my blade's been sharpened. See my brother's combo attack pushed him back, pull myself together and hear that lightning crack.