B'TX ビート・エックス 16

Teppei and Kotaro are reunited and fight together against the seemingly invincible Raphaello. We learn why Misha and Nasha are aiding the Machine Emperor just before they give their lives to aid the brothers. The Machine Emperor is eventually defeated, but no one has the energy left to safely return to Earth, but B'tx sacrifices himself to make sure the brothers get back safely.