Return of a Titan: The Lone Outlaw

Shortly after the Beast Incident, Robin kicks Beast Boy out of the Teen Titans only for him to disappear but when Slade and his mysterious ally appear three years later, a mysterious hero saves the Titans from certain death. Who is this hero and why did he come to Jump City and most of all, why does he seem so familiar? AU, Reboot of Teen Titans: Return of a Titan