The Heavenly Realm has become a place where everyone is obese, and the immortals rely on popping pills to stay alive. Unemployed Zhu Bajie is forcibly bound to a short-tempered fitness system, transforming from a useless, overweight pig into a muscular God of War. He opens a gym in the cybernetic Heavenly Court, helps Nezha break through his 1.4-meter height barrier, cures Li Jing's Parkinson's disease, and personally exposes the shocking conspiracy of a fake Taishang Laojun. When extraterrestrial demon gods invade the Three Realms, Bajie leads an army of tens of millions of muscular warriors, confronting enemies who wield the power of cosmic laws with nothing but their physical strength. Finally, he awakens his ancient God of War form and protects the Three Realms with a single punch. This is a story of an underdog's rise, where sweat triumphs over pills and muscles save the world.