Killer Instinct, known as An Unlikely Challenger in the English dubbing version, is the twenty-first episode of Baki the Grappler TV. This episode first aired on May 28, 2001.
Summary[]
Yuujirou Hanma shows up after Baki's fight and knocks him out, and Doppo Orochi challenges Yuujirou to a fight. After watching Doppo spar with his students, Baki spars with him. Yuujirou starts a fight with a group of boxers at their gym, and he fights with Izou Motobe and Baki's next opponent is revealed.