Black X is a criminal organization that acts as antagonist in Red's storyline in SaGa Frontier. Black X is involved in many criminal activites, such as terrorism, smuggling of illegal weapons and drugs, kidnapping and slave labor. Their presence is tolerated by Trinity, the region's government, as Black X supplies them with technology and armaments. Red is after Black X for revenge on the murder of his father, who was investigating Black X and Dr. Klein, who was a former friend of his.