The Season 5 finale of The Batman (2004), titled serves as the series’ grand conclusion, transitioning the narrative from a solo Batman story into the broader dawn of the Justice League. The episode focuses on the "non-powered" heroes—Batman and Green Arrow—leading a de-powered League against an invasion by the Joining. Plot Overview and Resolution
Batman leads the de-powered Superman, Green Lantern, Flash, and Martian Manhunter to a secure lab beneath Wayne Industries. He equips them with specialized gadgets designed to exploit their own stolen powers—such as a Kryptonite gun for Superman and a yellow powder dispenser for Green Lantern. [S5E13] Lost Heroes: Part Two
Robin identifies a structural weakness in the androids' chest plates. By smashing these symbols, the League members successfully reclaim their powers and repel the initial ground assault in Gotham City. The Season 5 finale of The Batman (2004),