Gundam Build Fighters (2013)

S01E12 Discharge

An unmanned, Mega Size Model Zaku is deployed mid-battle royal with a single mission: destroy the Star Build Strike Gundam. Forced to adapt, Sei and Reiji form an unexpected alliance with former rivals. But against such overwhelming power, they have no choice but to unveil their ultimate weapon. The Star Build Strike’s secret trump card is finally activated, changing the course of the fight and the tournament itself.