Ep. 20: Shun meninggalkan tim karena keraguan, namun kembali setelah intervensi Alice dan pertarungan dengan Komba.

The episode starts with the brawlers realizing that Naga has not yet reached the level of Ultimate Evolution as he is still trapped within the Silent Core. Billy also tells them that Masquerade had shown him, Klaus, Chan, Julio, and Komba Naga who used the negative energy to brainwash them. Shun remains quiet throughout this and later leaves the team as he feels none of them will be able to beat Masquerade — Dan and Runo always quarrel, Marucho moans over the loss of Preyas. Alice goes after Shun to help him realize that he cannot face all battles alone and requires the support and help of his friends. Initially Shun does not agree with her, but then seeing Komba acting so tough made him realize that Alice was right. After Shun's victory over Komba, Dan comes running to Shun and Alice, begging Shun to rejoin the team. Shun complies and the episode ends with Komba pleading Shun to be his teacher in ninjutsu. (Source: Wikipedia)
Episode
- Ep. 16 · Dan dan Drago menghadapi Chan Lee sementara tim menduga Webmaster Joe mengkhianati mereka untuk Masquerade.
- Ep. 17 · Klaus memikat para petarung ke Jerman untuk menangkap Preyas bagi Masquerade.
- Ep. 18 · Marucho dan Runo memasuki sarang Masquerade dan menghadapi Julio Santana dalam pertempuran Bakugan.
- Ep. 19 · Julie dan Dan bepergian ke Jerman untuk menyelamatkan Billy dari kendali Masquerade selama duel sengit.
- Ep. 20 · Shun meninggalkan tim karena keraguan, namun kembali setelah intervensi Alice dan pertarungan dengan Komba.
- Ep. 21 · Tim Bakugan mengembalikan Komba ke Kenya sebelum pertempuran baru menantang kelompok tersebut.
- Ep. 22 · Drago Berevolusi Menjadi Pyrus Delta Dragonoid di Tengah Transformasi Meteor Lava
- Ep. 23 · Tim mengunjungi Webmaster Joe yang dirawat di rumah sakit, yang berujung pada pertarungan di atap dan pengungkapan tentang Wavern.
- Ep. 24 · Dan Kembali ke Rumah Sambil Alice Melatih Christopher dalam Pertarungan Bakugan