After Leo Valdez returns from rescuing Calypso, he is given a quest from the gods. He and Calypso must journey to the land of wizards to help them recover after the war. They think it will be easy enough, with Leo being such a great builder and all, but then they are told they can't reveal themselves as demigods.

By: Jessica and Juliet ~SeaweedBrain~ ~KelpHead~ It all starts with a dream. A castle and three teens. What could it mean? Follow Jessica, Juliet, Nico, Rico, Annabeth, Percy, Amine, Antonio, Megan, Harry, Ron, and Hermione in a story of epic proportions and maybe a little tournament thrown in. My disclaimer is done here so we don't have to say it every chapter. We do not own any Harry Potter or Percy Jackson characters although that would be awesome if we did. The only characters we own are the ones we made up.

Percy Jackson has always been different. Even by demigod standards. He had normal demigod problems...dyslexia, ADHD, and monsters. He had normal problems. Bad grades, getting into trouble at school, that kind of stuff. But he was also the son of Poseidon, the subject of two Great Prophecies, the Hero and Savior of Olympus, one of the only living beings...gods included, to survive Tartarus, one of the only demigods to bathe in the Styx, and one of the only beings that ever held the sky. All that makes him different. But now, he was about to delve further into abnormality, when he finds out he has another evil grandfather. This time it isn't an evil, immortal, all powerful Titan Lord that likes eating his kids...just a powerful, evil noseless creep with a freakish, yet hilarious name that somehow makes people flinch. And now, Perseus Jackson, the son of Poseidon, is about to go on his strangest adventure yet...going to Hogwarts School of Magic. Yet another tragically hilarious name. (Look, I know there are a lot of these and it's pretty classic, cliche, and slightly overused, but I promise you readers that this story does not fit into that mold. Give it a shot, and see how it goes. But if anyone steals my plot...I'll feed you to my pet Hellhound :). )

Percy's life couldn't get any weirder. or so he thought. Apparently, he has ANOTHER evil grandfather named Mouldy Warts. ok, so maybe that wasn't really his name, but whatever. ~ Harry can't believe his greatest enemy has a grandson! He destroyed Harry's family, he doesn't deserve one! Harry has no doubt this kid will be just as bad as his grandfather. or will he? Enjoy Demigods! -Shark

[Set after Percy Jackson and The Olympians: The Last Olympian & in Harry Potter and The Order of Phoenix] Note: This is the rewritten version from @foreverdieyoung13 ;). It's three months after the Second Titan War. The demigods are still recovering after the event, but they're slowly becoming themselves again. Percy Jackson was hoping for a normal life. Well, as normal as a son of Poseidon can have. One war is enough for him, he didn't wanted to be involved with another. Rather unfortunately for him, the Fates and the world think the opposite. Percy was now thrust to a completely new world with Thalia and Nico. They have to go to the Wizard school for a year undercover. Great.

[1] New Beginnings: WARNING!! Story is technically complete but I started editing literally years ago then never finished so the beginning's a little funky! Percy Jackson was adopted at the age of seven by the nastiest family in the world: the Dursleys. He met Harry Potter, the most wonderful person in the entire universe, that same day. Though completely unrelated, the boys were nearly identical, a connection forming between them that would last years to come. The pair would go through life as brothers in everything but blood. Connected at the hip, these seemingly average boys had much more in store for them than they could ever imagine. A note: Percy Jackson doesn't discover anything about the demigod side of his universe until later in the second book. Just a warning. If that's too slow for you, don't read. DISCLAIMER Note that I do not own anything that was created by J. K. Rowling or Rick Riordan. I only own some of the plot and the occasional person or place that I may create myself. WARNING When people comment mistakes, I come back and I make sure that they're fixed. So, I'm still editing.

Set six months after the House of Hades, and in the Harry's fifth year at Hogwarts. Percy Jackson, Son of Poseidon, Hero of Olympus and more recently, Survivor of Tartarus, has been given a quest. Along with his two cousins Nico Di Angelo and Thalia Grace, he must go undercover at Hogwarts School of Witchcraft and Wizardry for a year. Their objective? Protect Harry Potter, Ron Weasley and Hermione Granger. Harry has had a rough summer, what with the dementor attack and the Dursleys. He thinks life back at Hogwarts will turn things around, only to realize that he is facing a year of ignorance and scorn. When the golden trio meet the children of the Big Three, will they become friends, or worst enemies? *Currently being rewritten under the same author. I'm leaving this one up for anyone that still wants to read it, but you can find a slightly different, hopefully better version on my page*

So what happens when Percy Jackson's bloodline is a little bit more magical than anyone had really thought. Percy is the unknown dcendent of Lord Voldemort and now Dumbledore is having him fetched to Hogwarts. He's not allowed to go without a supervisor to keep him from blowing up the school. What do the HP characters make of Percy and his cousin Nico and their cryptic references? All characters belong to Rick Rordan and J.K. Rowling.

A Percy Jackson and Harry Potter Crossover Fanfic The war with Gaea is over, and the only plans Percy have are to spend time with Annabeth. But when a crazy old man comes knocking on his door, his whole life is turned upside down. With another evil grandfather out to get him, he has to go to Hogwarts, a place where Magic is more than just a thing for children of Hecate. A Percy is the grandson of Voldemort story. Set in the Order of the Phoenix and after the Blood of Olympus