Perseus 'Percy' Jackson was just your average, deadly and powerful demigod - which happens when your one of the sons of the big three - until he found out that his mother, Sally Jackson-Blofis had a twin. Sally Jackson-Blofis is actually Sally Wayne, twin to the successful billionaire Bruce Wayne. When Sally, Paul and his unborn half-sister was found dead in their apartment, Percy's guardianship status was given to Bruce Wayne. Oh and um.. Almost all the Seven dies except Leo. Slight mention of Marvel of course.