Disclaimer: I do not own Percy Jackson.

A/N: Okay i know a lot of people are wondering when Thalia will be introduced. As you know She was rescued in the second book and only appeared as a main character in book three. So i have decided to by pass sea of Monster (Personally i find it the worse of the whole series) and have Percy use the Power of Chaos to return the Golden Fleece. However that won't be until the end of book one, after the bolt has been returned.

Camp Half-Blood Chaos Cabin

Percy laid on his bed thinking. Now that he had come back in time, maybe he could safe the other demigods that had been victims of the second titan war. He definitely wanted to save Bianca, plus Zoe as well. He also wanted to safe Selena and Charles, he also decided to Will so at least Clarissa would have someone to love. Percy looked up to the ceiling, he was finally beginning to realise that this mission might not be as simple as he first thought. He was going to need help, not just Thalia help, but divine help. All the Olympian council were out, they were all going to be wiped from existence, except Hestia, she hadn't done anything and maybe having an older god on the new council would be a good idea. Another God that did pop up into Percy mind was Hades. True he was the brother of Zeus and Poseidon, but he hated them just as much as Percy did. Also an army of the dead, would be a big help in his conquest over Olympus. The question was would Hades be willing to betray the other Olympians?

"Dad I need to speak to you, if you are listening?"

Percy looked to the side of the bed and smiled as a vortex opened up and his father stepped out. Percy sat up and swung his legs over the edge of the bed. He was glad that Chaos was his father, at least when he needed him, then he was there. Unlike Poseidon.

"What can I do for you Perseus."

Percy jumped off his bed and began to pace back and forth in front of his father. He wasn't sure how he would react to his plan, but there was only one way to find out. He stopped pacing then turned to Chaos.

"I think I might need help. Not just other demigods, but divine help." Chaos raised his eyebrows, in interest.

"Go on."

Percy stood silent for a minute. "I was thinking of asking Hades, to join our side. One he was betrayed by Zeus, two he has a serious grudge against his brothers, and it was only in the battle of Olympus that he decided to help them. Three Nico and Bianca could prove very useful and finally he is the only God that has done his job."

Chaos stood there in deep thought. He could see where Percy was coming from, but he had decided that all the Gods were wiped out, so that Percy could build a new council. Still what Percy had said did have merit. Hades was the only one doing his job has a God. And maybe having him help Percy will make his task that much easier.

"Very well Perseus. I stand behind you on this decision. Chaos was about to walk back through his portal when Percy stopped him. "Dad there something else I need. I have discovered the perfect way to get back at Lady Athena, but I will need your help."

Chaos paused. "I'm Listening."

Underworld

Hades Lord of the Underworld, sat in his study. He two was concerned about the recent events. He like Zeus had suspected that Poseidon son had stolen Zeus prize possession. His helmet of Darkness had also gone missing. He had decided to take Poseidon son's mother as hostage, forcing him to come and get her from the underworld. When he finally arrived, then he would demand that the boy handed over not only the masterbolt, but his helmet as well, which he assumed the boy had stolen too.

He turned his eyes to a small globe and noticed to young teens playing around in a room. One was a boy in black t-shirt, black jeans with black hair and the other was girl who looked very similar to the boy. These two children were is own son and Daughter. He had hidden them away from Zeus and Poseidon because of the Big three deal they had made. Of course what Zeus and Poseidon didn't know was that he had actually broken the deal first. Then his eldest brother had revealed that he had a daughter. Once Thalia was born then Poseidon decided that he too would have a demigod. The reason the three had broken their deal was due to the great prophecy. It stated one child of the big three would chose to destroy Olympus or save it. Hades knew his brother would be jealous if his two children were the chosen one, and decided to keep them hidden to avoid what had happened to Zeus's Daughter. He had hidden them in a casino in Las Vegas, however this casino was no normal casino and was in fact the den of the lotus eaters. Once someone stepped into the casino and ate one of the Lotus, then they were trapped in time. Although his children would have been 80 odd now, the casino had persevered their teenage bodies making them look no older then 13 or 14.

Hades was pulled from his thoughts by someone calling him. This seemed most odd had no one ever called him. He stood from his desk and noticed a an iris message behind him. In the bubble was the boy who had caused big trouble on Olympus. Perseus Jackson. Hades was intrigued at what the Son of chaos would want.

"What can I do for you Perseus. It's not everyday that I have a demigod call me."

Percy looked Hades straight in the eye. "I need to see you on a personal matter. Something that I feel we would both benefit from. Could you please transport me to the underworld so that we my discuss my plan."

Hades paused, he was thinking what could the son of Chaos possibly want to talk about. Still he was rather bored, and decided maybe the company would be a good idea. What he had seen of the son of Chaos is that he hated his brother with passion. This was already a thumbs up in his book, especially when he too hated his brothers. He waved his hands making a black cloud appear. Out of it walked Percy. Hades gestured for Percy to take a seat.

"So what can I do for you Perseus. You mentioned a proposition that would benefit us both. So what is it?"

Percy looked at Hades, then replied. "Before I reveal anything I need you to swear on the Styx that this conversation will go no further, and that you will not reveal what I say to any other God or Goddess."

Hades raised his eyebrows. "You do realise who you are addressing boy? I am the God of the underworld, and you will show me the respect I deserve. However I will allow your lack of manners to slip this once. As for the oath. I Hades Lord of the Underworld swear on the river styx, that I will not reveal anything mentioned by Perseus Son of chaos, to any member of the Olympian council or minor Gods and Goddess. This I swear."

Perct heard rumbling in the sky to signal the deal had been done. He sighed in relief.

"Lord Hades, you may think that I am the son of Chaos, but in another time, I was the Son of Poseidon. In that time line I was the child of the great prophecy and decided to save Olympus. However once the deed was turn, the Olympian council turned their back on me, and I lost everything. It seems my father had decided that one child wasn't enough and had hidden a second child called Mark, my brother. When he came to camp half-blood, took everything away from me, my life, my love. I became an outcast and ended leaving camp half-blood. I decided that I would try live my life has a proper mortal instead. When I returned home, I discovered that my family had been killed. It seemed everything had been taken away from me, I decided to end it all. Just before I was about to fall onto my sword Chaos revealed himself to me. He made me a deal. He said that I could go back in time and do everything again, only this time I would be his son, and my mission was to destroy Olympus instead of save it." Percy paused to allow Hades to take in everything that he had said.

Hades again raised his eye brows. "How do I know what you are telling me is true?"

Percy sighed. "Very well if you need more proof. I know about Nico and Bianca. I know that you hid them in the lotus casinp, as you wanted one of them to be the child of the great prophecy. I also know that you are planning to have one of your furies pick them up and then enroll them into a boarding school."

Hades eyes widened. He couldn't believe it. No one knew what he was planning. The only one who knew where is children were was himself and his furies. This alone meant that Percy was actually telling the truth. Hades sat back in his chair and placed his fingers together.

"Very well Perseus, I believe you, but what is your plan, that benefits us both?"

Percy took a deep breath. "If you are willing to help me destroy Olympus, then I promise you a seat on the new council. No longer would you rule the underworld, heck if you wanted you could rule the Sky or any of the other domains. Chaos had as also approved this plan, and if you need any other incentive, then I can tell you right now who has stolen your helm of Darkness, and Zeus Masterbolt."

This grabbed the Hades attention. "You mean it is not your brother, who has stolen them?"

Percy shook his head. "No, however the culprit is a demigod. His names is Luke castellan a son of Hermes. In the last timeline, he was the one who awoken Kronos, starting the second titan war. With the help of Ares he stole not only Zeus bolt, but your helmet too."

Hades growled, how dear his nephew help a son of Hermes steal his helmet. he swore that Ares would pay for his lack in judgement. "Very well Perseus I will help you. Anything to get one up on my brothers. Beside I have grown tired of ruling the underworld, and think maybe Hades Lord of the Skies has a nice ring to it."

Percy nodded. "Okay here is what's going to happen." Perseus then spent an hour telling Hades everything that would happen from here on out.

Camp half-Blood Big House

Chiron stood on the porch of the big house, looking down on camp half-blood. He had just been visited by Poseidon who had told him about the deadline for Zeus's Masterbolt. It seems they had only less then a week to retrieve the bolt before Zeus declared war on Poseidon. Chiron had been instructed to allow Mark to lead the quest, in doing so it would prove his innocence. He had sent Grover with a message that Mark was to meet him here the moment he left the hospital wing. He noticed two figures walking towards him, one was Mark, the other was Annabeth. Chiron wondered if this was a good idea, especially with Poseidon and Athena hating each other. He waited until they were both standing in front of him. He then gestured for them to follow him. Once inside he turned to both of them.

"Mark, your father has just visited me, and requested that you are sent on a quest to find Zeus masterbolt. He also wants you to rescue your mother from the underworld, where Lord Hades is holding her prisoner. However before you go on this quest the oracle must be consulted. Up stairs you will find a room. Within this room you will meet the Oracle, who will give you a prophecy. Bare in mind though that the prophecy may not be as straightforward as it sounds."

Mark nodded, before he left Annabeth and slowly walked up the stairs. Immediately he noticed the temperature had dropped, and the upstairs was all dark and gloomy. He noticed one of the doors was slightly ajar, and walked in. The first think he noticed was the amount of junk in the room, armour and swords were just piled everywhere. It was then he noticed a figure sitting in one of the chairs. However it was so dark in the room, that he could hardly see anything. He moved closer until he stood right in front of the figure. His hairs on the back of his neck stood on end, as in the chair was the mummified remains of a woman. Mark eyes widened as he saw a soft green glow appear in the eye sockets of the woman. He then noticed a thick green smoke began to surround the woman, causing her to float up in the air. Mark was ready to leg it when he had a woman's voice.

"You shall go west with the spawn of Chaos, and face the god who has turned,

You shall find what was stolen, and see it safely returned,

You shall be betrayed by one who calls you a friend,

And you shall fail to save what matters most, in the end.

Mark growled. It seems he had no choice but to take his brother on this quest. He turned from the oracle and left the room, walking down the stairs. He was thinking of what he had heard. God who had turned, who could that be? And you shall be betrayed by one who calls you a friend? Mark really only had three friends they were Annabeth, Grover and Luke, who seemed to have helped him settle into camp. The only one he thought that would betray him was his brother Percy, but then again he didn't see him as a friend, and he was certain that Percy didn't see him as one. The last line was truly worrying. He would fail to save, what matters most. The only thing that mattered to him was saving his mother from the underworld. Was he destined to fail in saving her? He had been thinking so much that he failed to noticed he had already reached the bottom of the stairs. He then noticed Annabeth, Chiron and his brother standing there. However it seems Percy was smirking for some reason. Mark made his way towards the group.

"I spoke to the oracle and she revealed to me the prophecy. It states. That I will go west with my a spawn of chaos, and that we will face the God that has turned, we will find what was stolen and see that it his safely returned. I will be betrayed by one I call a friend and that I will fail to save what matter most to me in the end."

Chiron crossed his arms against his chest. "Very well, I would assume west means Los Angeles, after all that is the only entrance to the underworld that I know of. I am not sure about the God that has turned, or the person who will betray you, but remember what I said before, these prophecy could have several meanings. Now normally three demigod are allowed on each quest. Has the prophecy says that Perseus must go with you, then there only leaves one spot left. Who do you wish to come with you?"

Mark looked to see Annbath was biting her lip, he remembered what she had said to had never been on a quest, plus having a daughter of Athena could be useful. The fact she was cute was an added bonus. Mark turned to Chiron.

"I choose Annabeth to join me and my brother. On the quest."

Chiron nodded. "Very well you three will leave tomorrow morning. Make sure you pack everything you are going to need. You will also receive a pack for the quest. This will contain some money and other essential that you might need. I suggest you all get a good night sleep, and I will arrange for you to be driven into New York, tomorrow morning. From there you are on your own."

Chiron turned leaving the three teens to talk amongst themselves. Percy was grinning on the inside. This quest would be very different from his last one.

A/N: Well What do think to the first twist. Percy working with Hades. Hope you enjoyed the chapter, and please review.