Ep. 31: The One Left Behind

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Ruuji is attacked by a woman called Gaball, seeking revenge for her dead lover Dinga, who was part of Ra Kan's resistance army. Ron convinces her to take out her anger in a Zoid battle - her Brastle Tiger vs Ruuji's Murasame Liger. During the battle, a group of Bio-Zoids show up and Ruuji and Gaball are pushed into a trap. Ron and Mii come to their rescue, and Murasame transforms into Hayate Liger to finish the job. (Source: Wikipedia)