At night, Zeus summoned Poseidon, the god of the sea, and said that his son had stolen the lightning fire. He threatened that if he did not find it back as soon as possible, he would go to war. In reality, Percy Jackson (Logan Lerman), the son of Poseidon and his wife Sally, is a college student. At the age of 17, he can stay underwater for 7 minutes, but he is not interested in the teacher's questions about Shakespeare. While visiting the museum, he met the centaur teacher (Pierce Brosnan) in a wheelchair. The literature teacher turned into the goddess of vengeance and asked him about the whereabouts of the lightning fire. Fortunately, the centaur professor and the sheep boyfriend arrived in time and saved the day. They brought Percy to the camp and trained Percy. They found a female warrior Annabeth (Alexandra Daddario) to compete with him. After the defeat, Percy, who touched the water, activated his potential and became a brave and invincible warrior, and began to embark on a heroic journey to pursue the lightning fire. Facing the attacks of the snake lady Medusa and other gods and monsters, and the difficulties of the Hades and the Queen of the Underworld Persephone, he only has 10 days left to redeem himself...