AN: Hi everyone, I'm honestly super sorry to everyone who took the time to read my other story - Undefeated - and has been waiting for ages for an update. I will be continuing this story but it's going to be under some serious editing. When I first wrote it, I didn't really have a storyline planned so when I got to a certain point, I had no idea what I had written and got lost in the mess that was my plot. Hopefully this edited version of the story 'Undefeated' (now titled 'Undefeated (under serious editing)') will make much more sense and clear up all of the many confusions everyone had. Feel free to review or PM and let me know about any details I forgot to fix but all in all, I would recommend reading the edited version as there are going to be some major changes.

Also, italics is Percy's thoughts. Just in case you were confused and for some reason decided to read this bit of the AN for answers. (ya never know)

One more thing, this is set BEFORE the Trials of Apollo.

Disclaimer: As much as I'd love to, I don't own Percy Jackson or the Avengers :(

Chapter 1 - Prologue

Percy

Percy's day was going great. He woke up just in time to go to the dining pavilion and enjoy a wonderful breakfast of blue pancakes completely drenched in syrup, before heading on over to the arena to begin teaching his sword fighting class. After a gruelling 2 hours of putting up with the younger (and to be honest, slightly hopeless campers) he took a quick shower and wandered back to his cabin. Percy was unsure of what he should do with his spare time – after all saving the world hasn't given him much time to take a breather – and figured that the best thing to do would be to go bug Annabeth. After all, if he hasn't got anything to do, why would she?

His hand was just about to rap on the Athena cabin door when he realised: Annabeth was up in Olympus redesigning Aphrodite's favourite pillar (don't ask) and wasn't scheduled to be back for another week.

Darn. Now what do I do? Well, first things first, let's move away from the Athena cabin, you never know when a camper might come out so engrossed in a book that they walk straight into you without even acknowledging your presence.

After removing himself from his perch on the Athena cabin's entrance, Percy made his way back to his cabin with a new idea forming in his head. If he couldn't bug Annabeth the next best thing to do would be to visit (bug) his Mom.

So he grabbed his bag and stuffed in some camp shirts and jeans, as well as a few other belongings. He was so lost in his own thoughts that when he heard the creak of his door opening he instantly dropped his bag and uncapped Riptide in all its glory and brandished it to his would-be attacker.

"Oh, it's just you." Percy mumbled, wincing in pain as he recapped Riptide and grabbed his bag from its resting spot on his foot (he had foolishly put his Minotaur horn in his bag which he had dropped. . . on his foot).

"Thanks, I feel so welcome." the intruder retorted, sarcasm lacing their voice.

"Ever heard of knocking? I hear it's a great way to enter a room, just in case you didn't know." Percy mumbled back, repacking – if you can call shoving items as fast as possible with no concern for their wellbeing 'packing' – his stuff back into his bag.

"I definitely knocked, you've just got so much seaweed in those ears of yours that you can't hear anything unless it's Annabeth."

Percy blushed beet red and looked up and stared Jason right in the face.

"It's not like you can say much Mr. I've got lipgloss on the corner of my eyebrow" Percy remarked, smirking as colour flooded Jason's face.

"Shut up, Percy."

"You know I can't do that. Anyways, what brings you to my humble abode?"

"I saw you standing outside the Athena cabin looking like a lost puppy and thought you might want some company, but I see you've got other plans. Going somewhere?" Jason said, gesturing to the now fully restuffed bag Percy was zipping shut.

Percy sputtered indignantly. "I do not look like a lost puppy, besides if I was going somewhere, which I might not be doing, why would I need to inform you?"

Jason raised an eyebrow.

"Okay fine, I was packing to go visit Mom until you so rudely interrupted me." Percy replied

"Now that wasn't so hard was it? When are you leaving?"

"Soon, I was planning on asking Argus to drop me off at Central Park and then walking to the apartment to surprise her." Percy said, and as an afterthought added,

"Do you want to tag along? I'm sure she's dying to meet you."

"Does she even know I exist?" Jason interjected

"Not yet. . . but I'm sure she'd love it if I brought someone who wasn't Annabeth or Blackjack or Grover?"

"You just don't want to be alone in the van with Argus. Don't tell me his eyes freak you out."

"It's not that -"

"- then what is it?"

"I mean Argus is a great listener and all and he can really hit the accelerator when there's a monster chasing you -"

"Cut to it Jackson."

"I can't take the silence man! Seriously, who can sit in silence for like 2 hours? I just sit there and talk to myself mostly, Argus probably thinks I'm insane!"

"More insane than you actually are?" Jason innocently inquired

Percy glared. "Shut up, Grace."

Jason grinned cheekily, "Give me a minute Jackson, I'll be back with my stuff."

As Jason quickly exited the cabin, Percy couldn't help but sigh in relief. It would have felt like a lot longer than 2 hours if he sat alone in a van with Argus.

After an intense debate on whether or not mayonnaise is an instrument, Santa's elves actually being slaves and Percy defending his opinion on blue food being superior to any other kind of food, Percy and Jason (and an extremely confused Argus) finally reached Central Park.

They bid Argus goodbye, and grabbed their bags before beginning their walk to Percy's apartment.

"Jason, I'm telling you, you can definitely play mayonnaise! Think about it, if you drop different amounts on the floor, they'll make different sounds so –"

"Percy?"

"Yes Jason?"

"Shut up."

Meanwhile, at a secure S.H.I.E.L.D. facility -

Nick Fury was staring hard at the meagar few pieces of paper that were Perseus 'Percy' Jackson's file.

"What the hell kind of a kid blows up a school bus with a cannon?"

"Should we bring him in, sir? Agent Maria Hill inquired.

"Not yet, get Romanoff to spy on him, I want to know if he's a threat or not before we go 'round grabbin' kids off the streets." Fury responded

"Yes sir."

Little did Fury know that as Maria Hill dropped off the meager file in Romanoff's hands with the instructions from Fury, Agent Hill was planning a visit to an old mentor. A wheelchair bound camp director would be interested to know that a certain Son of Poseidon had once again, found trouble.