BF finds himself in a state of survival in Gotham City, the iconic home of Batman. Perched atop an unfamiliar building, he suddenly sees the shadow of Batman emerge, a recognizable silhouette. However, something feels off; Batman's smile is unsettling, and his eyes are a blank white, suggesting a corruption within him. The truth soon unfolds: Batman has succumbed to the Pibby Corruption, with dark sludge marring his batsuit and cape. To escape this fate, BF must engage in a rap battle with Batman, using his musical skills as a defense. As Batman hurls his batarang at BF, he simultaneously sings, turning their confrontation into a musical duel. With the backdrop of a red-tinged sky, BF realizes that he needs Batman's strength to combat the Pibby Corruption and ultimately seeks to free him from this dark influence. Only by uncorrupting Batman can they hope to end the Pibby Corruption once and for all.