Disclaimer: I do not own any characters and the places. I did, pjo the movie would be 10x better. Yeah, that's it. Have a nice day.

Percy had to admit, Stark tower was awesome. There was an Olympic size pool and the training center for the Avengers took up one whole floor. Nothing could beat Camp though in Percy's mind. Tony also showed Percy the science labs and he made a mental note to stay away from there. Tony explained that the tower was run by clean energy, which Grover would have appreciated. Grover. Percy felt bad that he hadn't had the chance to talk to G-man during the quest. Tony talked about the architecture in the tower. Percy thought that Tony was like Annabeth in way. They both liked to ramble on about architecture, though in Tony's case, architecture was technology. Tony showed Percy a spare bedroom. It was bigger then his bedroom back in his mom's apartment, but then again, it was Tony Stark. Percy had learned quickly that Tony was some kind of famous sciencey person.

"Well kid, tuck your self in. See you in the morning."

Percy nodded in thanks. Tony left the room and Percy decided to go to sleep, explaining about the gods took a lot out of him, not to mention the fight. He still didn't know if Zeus would blast him for telling the Avengers about the Gods. Oh well. Percy had more things to worry about. Like the fact that Kronos said Annabeth was alive, which was impossible. Percy saw it himself that Annabeth was locked in Tartarus. But if she was… Percy drifted off to sleep.

That night, Percy had a dream.

The cavern was pitch black, which reminded Percy of his dream of Kronos and Luke in Tartarus. In the blackness he could make out a faint figure. Annabeth! His mind jumped. So Kronos was telling the truth… Perseus, a cruel voice whispered in his mind. Percy tried to talk back, but talking in the dream was useless. Perseus, I will destroy everything you love. Your family, your friends. Starting with her. Chunks of rock from the cavern ceiling came falling down. Nooo! Percy tried screaming. And-

Percy woke up.

Percy was sweating from his dream. Was Annabeth okay? Was that an illusion? Percy didn't know. To ease his mind, Percy decided to swim until everyone woke up. It was 3:42. Percy lost time under the water. He jumped in with his clothes, sitting on the bottom. Swimming gave him a chance to rethink everything that happened in the past months. The quest…losing Annabeth… Percy sometimes thought that the Fates had made him their pet project.

His train of thought was broken when Tony's face peered at him at the top of the water. Percy resurfaced and commented, "Can't a guy have any peace during the morning?"

Tony just rolled his eyes and said, "Kid, Breakfast's ready. You better get some because your not getting any other."

Percy shrugged and used the water to propel himself out of the water. Percy gestured with his arms. "Breakfast?"

Tony muttered "Showoff" and walked away with Percy following.

At the kitchen, all the Avengers were there, including another blonde woman who Percy had never met before. Tony gave the woman a kiss on the cheek.

The woman greeted Percy with a handshake saying, "Pepper Potts. Just Pepper please."

Percy shook her hand. "Percy Jackson."

Percy got some food lying on the counter while the woman-Pepper, he reminded himself, talked to Tony about clean energy and other things Percy couldn't follow.

As soon as Percy finished his breakfast he and all the Avengers saw shadows gathering together. Out of the shadows came a skinny, pale boy who crashed into Percy. Percy steadied the boy by the shoulders. "Nico?" Percy asked.

The boy smiled. "Percy! I saw you on T.V."

Percy rolled his eyes and introduced him to the Avengers, who all had their weapons out. "Guys, it's okay. This is Nico, my cousin."

"As in, demigod?" Natasha asked.

Nico scowled at Percy. "You told them about the Gods?"

Percy nodded. "Relax. The guy over there is Thor, an Asgardian demigod, so they were bound to find out. Oh and the Fates told the pirate eyed guy, who isn't here, to find me. And Kronos is alive again."

Nico looked surprised. "Kronos? I thought he was back in Tartarus. And the Fates? You have the worst luck in demigod history."

Tony put his hands up. "Hold on. What do you mean by the Fates? Those three old ladies Fury mentioned?"

Percy scratched the back of his neck. "Well… those are the fates. They basically control your future with the string of life and all that."

So, it's basically the equivalent of Loki's glow stick of destiny."

Percy and Nico gave him blank looks.

Tony sighed. "Never mind."

Nico turned to look at Percy. "It's great to see you again, but that's not what I'm here for. The Underworld is a mess. It's like Thanatos is missing again."

Tony jumped in the conversation. "Like Thanos, the warlord S.H.I.E.L.D is keeping tabs on?"

"S.H.I.E.L.D is keeping tabs on all of us." Natasha reminded him. "Besides, how do you know that? It's top secret."

Tony just smiled innocently.

Nico shook his head. "Thantos is the greek god of death."

Percy groaned. "Great. An Underworld revolt. Just what we need."

Nico nodded. "Tartarus has been acting strangely lately. Father's been picking up a lot of activity near there, but he won't go check on it because..."

Percy jumped right to the point. "So we're up against Tartarus?"

Nico shrugged. "It makes sense, I mean, Kronos is back and Annabeth was trapped in..."

"I saw Annabeth in a was in a dark cavern, which could be in Tartarus, I guess."

Tony jumped in the conversation again. "Kids, we have no idea what you're saying. Dreams? Tartarus? The Underworld?"

Percy started explaining. "The Underworld is basically what it sounds like. You have Hell in the right and paradise on a island. A bunch of dead people, Cerberus, who really likes red, rubber balls and Hades, who is Nico's dad."

"Your dad is the god of death?" Tony said.

"God of the Underworld." Nico corrected. He continued on. "Demigods have dreams too. We can dream of something that might help us. Sometimes, if it's pretty important, Gods talk with us. But that rarely happens."

Percy jumped in. "They're usually pretty bad though."Nico ignored Percy and continued. "Tartarus is the pit of evil. No god has ever been there. Not even the god of death, Thanos-"So that's who is is." Tony muttered."Has been there. It's the monsters home territory. Chances are, if you've been there, you'll either die or go insane.""Not a fun place to be, I take it." Tony neither Percy or Nico seemed amused, Tony just shook his head."Can't take a joke, can you? It's like you've been there yourself."Percy and Nico responded at the same time. "We have."All of the Avengers stared at them. "No kidding." Tony said. "You've really been to hell.""Yeah." Percy said, nodding his head. "That's where Annabeth... he trailed off. All the Avengers already finished the sentence in his or her head.

Before anyone could open their mouth, JARVIS interrupted."Sir, Director Fury in the elevator."