Yey! I finally finished this. It's just a Halloween special I wrote for PJO. It has a mix of something sci-fi. I hope you guys like it. And Happy Halloween!

DISCLAIMER: I do not own anything.

"Percy! You're going to be late!" my mom shouted from the living room.

"Just a sec!" I answered.

"Where is that stupid trident!" I muttered to myself. There was this costume party at camp this year. Since everything was back to normal, and there was no war that could lead to our impending doom, the camp director, Mr. D, decided that we celebrate the 'moronic' Halloween this year, but it was mostly Chiron's idea. He said it would be nice to follow the accustomed tradition of mortals.

And yes, I'm going as my dad, Poseidon. No surprise there. I didn't really have any time to decide and look for a costume. Okay, you're right, I'm lazy. But hey, I have a very busy schedule to follow everyday. Okay, that's Annabeth. I'm just not really into the whole go-wear-something-ridiculous-that-looks-scary-to-get-candies tradition. The get-candies part is nice but that doesn't make up for looking stupid.

Anyway, back to the present. I can't find my trident! I've looked everywhere in my room. Twice! Annabeth would be arriving any minute and I'm still not ready. And just then, the doorbell rang. Just great.

"I'll get it!" I shouted. I burst out my room but before I opened the door, I went to check on my mom in the kitchen. "Mom, did you see my trident?"

She smiled like she usually did, I-know-something-you-don't. But I did know what she was about to say, I just forgot. "You set it by the door, so you wouldn't forget."

I groaned and slapped my forehead. "Thanks," I mumbled. I went and grabbed my trident before opening the door. When I opened the door I was startled, I jumped backwards and because of my stupid reflexes, I pointed my trident at the goddess. Or the one who looked like a goddess. Not in the she-looks-amazing kind of goddess- although she did look amazing- but really looks like a goddess. The Goddess of Wisdom, Athena, to be precise.

"Seaweed Brain, put down the trident. It's just me," Annabeth stated, grabbing my trident and lowering it down. She was wearing a long curly raven-black wig, completely hiding her blonde hair. She had on an elegant sleeveless white dress made of silk that ended up just a few inches below her knees, and she had flip-flops to look a little casual. She moved pass me and glanced around the apartment before looking back at me. Her stormy gray eyes were shining brighter than usual. It seemed like she was actually excited for the party.

"A-Annabeth," I stammered.

"Now you remember who I am," she said, rolling her eyes. "You know, you could get yourself killed. That's not the proper way to greet a goddess."

"Well, don't forget who you're talking to. I am the mighty God of the Sea," I declared with a very low voice, holding my fake trident and hammering it on the ground. She stared at me, looking up and down. I was wearing shorts that looked close enough to my father's typical Bermuda shorts. I had a red Hawaiian polo on top of a plain white shirt. And like Annabeth, I was wearing flip-flops.

"That means we shouldn't be getting along," she said softly, leaning towards me and curling her hands around my neck.

"Uh-huh," I smirked as I leaned in and kissed her. I let go of my trident as I put my hands around her waist and pulled her closer. My brain started to seize, forgetting that we were supposed to be on our way to the party, and that we were in the apartment with my mom. I didn't even notice that she was rapidly tapping her foot. It took a few more seconds before she cleared her throat to get our attention. I quickly pulled away from Annabeth, blushing furiously.

"Good afternoon, Ms. Jackson," Annabeth greeted, her cheeks a little pink.

"Annabeth, how many times do I have to tell you, call me Sally. If you want, you can even call me Mom," my mom declared as she grabbed the keys from the table. By this time, Annabeth looked like a tomato. "Oh, I'm just teasing," my mom chuckled as she passed by us and going out the door.

"I hope so," Annabeth whispered. I grabbed my trident and closed the door behind us as we laughed silently.

My mom dropped us off at the base of Half-Blood Hill. "Percy, remember to come back home early tomorrow. We still need to find a gift for Paul."

I nodded. Paul's birthday was coming, and we need to get him a gift. I told my mom that we should get him a sword, but my mom decided to drop that idea ever since we trashed the apartment when Paul and I dueled with plastic swords. She pointed out that if we could do so much damage with plastic ones, how much more with real ones.

"Annabeth dear, please watch Percy. The last time he had to wear a costume, I had to help him when he needed to pee."

"Mom!" I groaned as Annabeth laughed.

"Don't worry. I'll make sure he doesn't wet his shorts," Annabeth snickered. My mom smiled and waved as she drove off.

"Ha-ha," I said as we watched Paul's Prius disappear out of sight.

Annabeth rolled her eyes and grabbed my arm, dragging me up the hill. "Come on, Seaweed Brain. The party's in an hour, and we still need to help set up."

When we were about to reach the top, I stopped and looked at Annabeth. I gazed at her eyes, she was thinking the same thing. Something was wrong. Even from here, you are supposed to hear campers bustling around, especially now that they were preparing for the party.

We ran up, and when we finally reached the top, I gasped. Camp was completely deserted. There was no camper in sight, but the camp was decorated for Halloween. The Big House and all the cabins were plastered with cobwebs, skeletons in different positions were scattered everywhere, groups of pumpkins were laid on the grass, red glowing fire balls were hanging on wires above the ground. But there was no sign of a party about to start. It looked like a ghost town, or in this case, a ghost camp.

"Something's wrong," I exclaimed.

"Thanks for pointing out the obvious," Annabeth answered. I wanted to retort but before I could, she grabbed my hand and dragged me down the hill. I was glad she was ahead of me for her not to see me blush. I haven't really gotten used to the whole holding hands part.

"What are we going to do?" I asked.

"We still have no idea what happened here, so first of all, we need to look for clues," she said as we reached The Big House. "Now, we start- " she started but then she shrieked. "Spiders!" she creamed, pointing at the black plastic spiders hanging from the cobwebs on The Big House.

I sighed. I put my trident down on the ground and grabbed one of them. "Annabeth, they're just plastic," I said, approaching her.

"Don't get any closer. I don't care if they're plastic," she ordered, putting her palm up as she started walking backwards.

I know I will be in trouble, but this was too amusing. I didn't care what she'll do to me, and so I threw the spider at her and it landed on top her hair. She shrieked and scrambled as she tried to remove the spider. The spider fell off along with her wig, revealing her long curly blonde hair. I was heavily laughing as she kicked away the spider.

"You!" she said furiously, clenching her fists and stomping towards me. Her face was so red she looked like she was about to explode. I was surprised smoke weren't coming out of her ears.

I held my hands in surrender but it wasn't enough to stop her stampede. "Uh, head start?" I asked playfully.

She stopped in her tracks and closed her eyes. She gritted her teeth and started counting, "Five, four..."

I ran as fast I could. I know I won't get too far before she reaches me, but I'll take what I get. "One!" she yelled.

I was actually lucky enough to reach the strawberry fields before she caught me. She tackled me and I fell face first on the ground. It didn't really hurt because of my invulnerability, but what she did next caught me off guard. It felt like electricity surged through my body as she started poking me in the soft spot of my back.

"Stop it!" I screamed. At first, it was just a little ticklish, but it suddenly started to hurt even though she was just poking me softly. She kept on poking me, so I rolled over which resulted in me pinning her down.

"Ha!" I said victoriously, smirking.

She frowned. "Get off me, Seaweed Brain."

I wasn't about to oblige, but I heard a rustling sound. I looked up to see someone staggering towards us. Annabeth followed my line of vision and she gasped. I quickly stood and helped her up and ran to the camper just in time as she fell.

"Clarisse," Annabeth gasped. "What happened?"

Clarisse slowly lifted her head and looked at us. Her face was very pale, and it looked like she had some black and green make-up on. Her camp shirt and jeans were ripped in several parts.

"Virus... campers... undead..." she muttered. We tried to help her up but she suddenly pushed us away as she doubled over on the ground and cried in pain. "Run!" she mouthed before her body slumped. We knelt beside her body and rolled her on her back.

"Clarisse!" I screamed as I shook her. Annabeth checked her wrist for a pulse.

"She's alive. Come on. We need to get her to the infirmary," she ordered as she slowly lifted Clarisse. I hesitated as I stared at her. She told us to run.

"Percy!" Annabeth cried, taking me out of my thoughts.

I blinked, "Sorry." I helped her carry Clarisse but we ended up letting her go and fall back on the ground when she opened her eyes. We started walking backwards as she slowly rose up.

"Clarisse?" Annabeth asked cautiously. Clarisse regarded us with her eyes. They were pure black, like dark obsidians. The sight of her was frightening enough, but then she growled. And when she opened her mouth, she had fangs.

"Uh, shouldn't we be running by now?" I asked panicky. Annabeth nodded and we ran as fast as we could. I didn't dare look behind us but I can hear footsteps catching up with us. I took a quick glance just in time to see Clarisse trip and fall down on her face. Even though we were in panic, Clarisse falling on her face was definitely a funny sight. I silently snickered as we kept on running.

We decided to hide in cabin three for awhile as we try and figure out what just happened. I locked the door tight and we slumped against it, catching our breath.

"What was that all about?" I asked.

"I-I don't know," Annabeth answered, breathing heavily.

"You don't know?" I asked seriously but with a hint of sarcasm. She scrunched her eyebrows as her mind started working.

"Clarisse mentioned something about a virus. Maybe that's what caused her to change. Then she said something... undead. I think that's what she just turned into. And by the looks of it, all the campers were infected."

"What? I mean... that's crazy! Those kinds of things just happen in movies," I exclaimed. Annabeth remained silent. "Uhm, right?"

"Well, it is possible. I've read something about a virus called the Krippin virus. It is some type of measles virus. There were studies that showed that the virus can be adapted into a cure for cancer. At first they were claimed to be one-hundred percent successful, but some tests caused patients to turn into mindless zombies. So the project was eventually dropped."

I looked at her very appalled. "I'm not even going to ask how you knew about that."

She glared at me. "As I was saying, it is possible that something like that might have caused this."

"Okay. So what can we do to turn them back into normal humans?"

"As far as I know, there was never a cure. And knowing how the government deals with those kind of stuffs, I'll assume they all killed the zombies."

"We can't just kill them!"

"I know!"

I sighed. This isn't the time to be arguing. Apparently, someone has turned camp into a sci-fi home of the undead.

"But why camp? Mortals don't know it exists."

"It means that whoever caused this is someone who knows about the existence of Western Civilization."

"You're right," somebody said in a very hollow voice. We quickly stood up as I drew Riptide and Annabeth removed her dagger from the strap under her dress. Somebody appeared from the deep corner of the cabin, his eyes glowing red. We gasped as we noticed who it was.

"Hello," he greeted as he laughed coldly.

AN: I hope you all liked it. It's just something that came into my mind when I was preparing the next chapter for Percy Jackson and the Falling Stars.

The virus thing is the one from I am Legend. That movie is awesome! One of my most favorite thriller movies.

Anyway, I'll upload the next chapter soon. I just left here a cliffy, well, beacause I love leaving you guys hanging! LOL.