Mars, the God of War, is the central antagonist of Saint Seiya Omega.
He was sealed by Seiya years ago, though his resurrection was imminent.
Mars’ goal is to destroy the world as it is and create a whole new world using the planet of his namesake.
Mars can use the element of darkness.
Mars appeared for the first time against the Saints of Athena during the temporary peace that followed after the Holy War of the twentieth century. Leading a group of warriors called the Four Heavenly Kings, Mars struck Earth and attacked Athena (Saori Kido), who alongside Sagittarius Seiya, Andromeda Shun, Dragon Shiryu, Cygnus Hyoga, and Phoenix Ikki would rise to combat this new evil.
When the battle was about to be decided, a huge dark meteor fell on the battlefield, stopping the fight. Athena tried to stop the meteor until she saw two newborns, a redheaded boy (Koga) and a girl with light blue hair (Aria). Athena then used her Cosmo to save them, but could not fully stop the meteor, which struck Mars and transformed his body even further, as he once again came after Athena in a clash of light and darkness. Athena’s Cosmo went to Aria while the dark Cosmo went to Koga, tenporarily greying his skin to indicate its control for the first time. Ironically, it was Koga who Athena was able to rescue while Aria was taken by Mars.