The first trailer for Percy Jackson: Sea of Monsters reintroduces fans to the Half-Bloods, children of the Gods who are half-human and half-God. Logan Lerman returns as the title character, who goes on a quest to find the Golden Fleece, the only thing that will save his community from an evil villain who wants revenge on the Gods. Check out the first footage from director Thor Freudenthal's upcoming sequel, also starring Sean Bean, Nathan Fillion, Alexandra Daddario, Stanley Tucci, and Brandon T. Jackson.