Logan Lerman did a lot of research for his role in Percy Jackson & the Olympians: The Lightning Thief. The 18-year-old actor tells Teen Vogue, "I've been studying mythology for months, reading about Perseus, Poseidon, Apollo, Medusa." Wanna see the movie without cracking a textbook first? Here's your Greek cheat sheet for who's who in mythology.
For starters, Percy is a demigod, which means he has one human parent -- his mother -- and his father is Poseidon, ruler of the sea. Because of his lineage, Percy has special aquatic powers like breathing underwater. Water can also heal him whenever he's hurt.
Poseidon has two brothers, Zeus and Hades. The three of them made a pact to no longer have children, so when Percy's true identity is revealed, not all of the gods are pleased.
Poseidon considers Percy to be his favorite son, and calls him an even better hero than Hercules. But Zeus, king of all the gods, isn't as thrilled to have Percy around. Hades rules the underworld and pretty much feels the same as his brother Zeus.
When it comes to love, Percy is on Aphrodite's good side -- which is why she interferes in his relationship with Annabeth. Annabeth and Percy are BFF, even though they annoy each other a lot of the time. Her mom is Athena, the goddess of wisdom and war, and she wants Percy to stay away from her daughter. Percy hasn't done anything to trigger this disapproval, but Athena and Poseidon have a history of not liking each other.
Hermes is the Olympian who explains the relationship between heroes and gods to Percy. You should also know about Dionysus, or more commonly known as Mr. D. He's totes not a fan of Percy and always calls him by the wrong name to get on his nerves. Whew, ready to buy your movie tix now?