During the Credits (spoilers)
After some credits have rolled for Percy Jackson & The Olympians: The Lightning Thief, there is an extra scene with Percy’s stepfather Gabe who comes knocking at the door. Percy’s mother answers it and points to him all the junk he has to move out the apartment. After she leaves him, he craves some beer and goes to the refrigerator where there is a note by Percy to never open the door of the refrigerator (it’s also padlocked). The stepfather pries open the refrigerator to see Medusa’s head as the lights go out and the sound of him turning to stone is heard.
After the Credits
There are no extras after the credits of Percy Jackson & The Olympians: The Lightning Thief.
Special thanks to baliwesti and estelito for the stinger submissions and Brett for the correction!