While Dan is shocked by a surprise visit from his father and Mira reminisces over Keith, Ace searches the city for a place Baron can stay. As he approaches a future building site for an apartments complex, Baron calls Ace and tells him how the Haos Energy was stolen by Hydron. Then Mylene appears and challenges Ace for the Darkus Energy. As the battle drags on Ace and Midnight Percival eventually become overwhelmed by her mechanical bakugan.