San Hill was a male Muun, also unknown to all as the Sith Lord Darth Plagueis. After his alleged death by his apprentice Darth Sidious, he hid his force presence from him and continued his role as the InterGalactic Banking Clan Chairman until after Sidious's death. During the Clone Wars, he was the only Separatist leader to survive Darth Vader's raid on the planet of Mustafar by using an ancient Sith technique known as "gniyalp mussop". During the Imperial Period, Hill rarely traveled off Muunilinst, leaving his dealings to his Sith apprentice at the time.