Stephanie Jackson, biological sister of Percy Jackson, the most powerful being in the world but no one knew. Stephanie Jackson betrayed by her the gods when a new camper arrived. She was abused by Sally Jackson and Gabe Ugliano. She was pushed around and doing all the dirty work at Camp-Half-Blood and hit by her half brother, Sam. Percy never knew she existed because he was betrayed by everyone and was with Chaos' army. One day, he is sent to Earth to help with another titan war. And that's how he found out about his sister.