Here's a summary of the key events:
* Percy is accused of stealing Zeus' lightning bolt: Percy's life is turned upside down when he is blamed for stealing Zeus' lightning bolt, which could spark a war between the gods.
* He goes on a quest to clear his name: With the help of his friends, Annabeth Chase (daughter of Athena) and Grover Underwood (a satyr), Percy embarks on a quest to find the lightning bolt and prove his innocence.
* They face many challenges: Along the way, they encounter mythical creatures like Medusa, Minotaurs, and the Furies. They also face challenges like navigating the underworld and battling the god Ares.
* Percy discovers his true potential: As the journey progresses, Percy begins to develop his godly powers and learns about his heritage. He realizes that he is not just a son of Poseidon, but a powerful demigod in his own right.
* They confront the real thief: Percy and his friends discover that the true thief is Luke Castellan, a seemingly friendly demigod who is secretly working for Kronos, the titan who was overthrown by the gods.
* Percy delivers the lightning bolt: Percy confronts Luke and defeats him, retrieving the stolen lightning bolt and returning it to Zeus.
* Percy's journey continues: The movie ends with Percy and his friends returning to Camp Half-Blood, but their journey is far from over. The prophecy surrounding Percy's future remains unclear, hinting at future adventures and challenges to come.
Note: The movie deviates from the book series in several ways, including:
* The portrayal of characters: Some characters are significantly altered, both in personality and appearance.
* The plot: The movie condenses the book's storyline, eliminating some crucial plot points and events.
* The ending: The movie's ending is altered compared to the book's, leaving a different tone and feeling.
If you're a fan of the books, it's important to keep in mind that the movie is a separate adaptation and not a perfect representation of the story.