Percy Jackson: Sea of Monsters , the sequel to the 2010 book series adaptation Percy Jackson & the Olympians: The Lightning Thief , has added three to its cast. The Hollywood Reporter has word that Mary Birdsong, Yvette Nicole Brown and Missi Pyle have all signed on to play the Three Fates. The sequel finds Percy Jackson (Logan Lerman), the son of Poseidon, continuing his epic journey to fulfill his destiny, as he teams with his demigod ...