In the virtual reality arc, Shizuka, along with Honda and Ryuji, dueled against the fourth member of Kaiba Corp's Big Five, who had assumed the form of Mechanical Commander, and later Perfect Machine King.
In the virtual reality arc of the second season, Kawai, along with Hiroto Honda (Tristan Taylor) and Ryuji Otogi (Duke Devlin), duel against the fourth member of Kaiba Corp's Big Five. This member assumes the form of Mechanical Commander, and later Perfect Machine King.