After their planet Beal fell to the enigmatic Gaizok, the survivors sought refuge on Earth, dividing into the Jin, Kamie, and Kamikita clans. As the Jin Family on Earth readied themselves for the impending Gaizok threat and their colossal Mecha Boosts, they united three vehicles to create the formidable Zambot 3. Amid protecting Earth from Gaizok assaults, the Jin Family faces not only battles but also the distrust of those they shield, who hold them accountable for the invasion.