In the 1970s, Bruce Wayne, better known as Batman, finds himself drawn back into his past when a dead millionaire's connection to a mysterious martial arts master brings forth old memories. Having trained with that same master, O-Sensei, in his formative years alongside other elite students, Bruce revisits the isolated dojo in Nanda Parbat where his skills were honed. Here, alongside his former peers—Richard Dragon, Ben Turner, and Shiva—Bruce confronts not just his own inner demons, but also a growing threat linked to his and his friends' shared history.

When the group discovers that a coveted artifact from their dojo days is tied to a plot that could unleash an unspeakable evil upon the world, the former students are compelled to band together. Combining their martial arts prowess with detective skills, they embark on a perilous mission that pits them against formidable foes from their past. Their brotherhood is tested as they face off against the forces of darkness, racing to secure the artifact and confront the mysterious power it represents before it can be used to destroy the balance of the world.