It turns out that Heihachi, in fact, survived the explosion, and now pledges to find out and 'break the neck of the one who started this ridiculous tournament!'. A few months later, the King of Iron Fist Tournament 5 is announced. The explosion, however, revives Heihachi's father Jinpachi Mishima from his 44-year slumber chained up beneath the Temple and proceeds to reclaim the Mishima Zaibatsu. They quickly overwhelm him and self-destruct, leaving Heihachi seemingly dead.

Then, Kazuya turns into Devil Kazuya and escapes, leaving Heihachi to deal with the Jack-4s by himself. Initially, Kazuya and Heihachi fight the Jack-4s as a team, but eventually, Kazuya throws Heihachi across the room as soon as he notices that Heihachi is getting tired. Shortly after, several Jack-4 robots invade the compound, programmed to take Heihachi's life. However, Jin defeats both of his predecessors and flies away, leaving the latter two unconscious. Following the conclusion of the King of Iron Fist Tournament 4, Heihachi Mishima defeated his son Kazuya Mishima and led him to Hon-Maru Temple, planning to let both Kazuya and his grandson, Jin Kazama, battle and steal their respective ' Devil Genes'.

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