Percy awoke with a feeling of dread. It took him a moment before he remembered the cause.

Now, it took a lot to make Percy Jackson feel dread. For you see, Percy Jackson was a half-blood, one of the children of the Greek gods, in his case Poseidon. He had faced down fearsome and deadly monsters straight out of nightmares. But what he faced now was something far worse.

It was his first day at his new school.

Percy had never really liked any of his schools. Being ADHD and Dyslexic, like most half-bloods, he did pretty poorly on his schoolwork. On top of that, he tended to make enemies of the bullies and popular kids, which in turn meant that few people were willing to be friends with him. Percy didn't see why this new school should be any different.

Of course, this school was supposed to have a different way of doing things, but Percy had been to several schools like that. It had a weird name, and he would have to take a special cab to get there. Munster High, was it? Ah well, didn't really matter anyway.

Percy looked at the clock by his bed and decided that, as comfortable as his bed was right now, he shouldn't wait any longer. He got out of bed and dressed sullenly, then headed downstairs.

Percy's mom had set out breakfast. On the counter were blue scrambled eggs, blue sausages, and blue chocolate cookies. She always made blue food on special occasions. Percy supposed that she was trying to cheer him up, and it was sort of working. Percy took a little of everything and began eating, feeling a bit happier. It was all delicious.

After a few minutes, Percy's mom came out of her room. She had her uniform on and looked ready for work. Seeing Percy, she smiled radiantly and pulled him into a hug.

"Good morning Percy," she said. "Ready for your first day of school?"

Percy hugged her back tightly. "Good morning mom," he said. He shrugged. "Yeah, I guess I am. Ready as I'll ever be, anyway." He sighed. He wasn't looking forward to it. But then he remembered that his mom was working hard to pay his tuition on top of putting herself through night school. He looked up at her and forced a smile. "I'll do my best," he promised.

Percy's mom smiled knowingly. "I know you haven't had very good experiences with your schools in the past, but I've heard very good things about this one. One of my customers at work recommended it to me. I mentioned that we were looking for a school, and she said that she thought it would be a perfect fit for you. Apparently her daughter goes there, and they're really good about providing their students with what they need to learn. You should at least give it a chance."

"I will mom," Percy promised.

Percy's mom glanced at the clock. "My gods Percy, look at the time!" she said. "It's almost time for you to leave. Hurry up, or you'll miss your cab."

Percy hurriedly finished his breakfast and ran downstairs. He ended up making it down to the street two minutes late. He saw the cab with his name on a sign pressed against the window. He hurriedly got in the back. "Thanks for waiting," he said to the driver through the partition.

"Yeah yeah, yer bloody lucky kid," the driver grumbled. "If yer late again I'll just leave yeh. Now 'ang on, we'd best get a move on." The car lurched and took off. The man's accent sounded British.

Percy hadn't gotten much sleep the night before, so he got in a quick nap on the ride there. He didn't even notice the slight jolt as they rode through the tunnel.

Before Percy knew it, they had arrived. He thanked the driver and walked up the steps. They were early, so none of the other students were there yet. He walked up the steps, taking note of the architecture.

One thing that struck him was the accessible entrances. There were lots of wide doorways, ramps and elevators, as well as a few things that he couldn't identify the purpose of. Clearly this school was big on disability access. Percy took that as a good sign. Hopefully this meant that they would be understanding of his ADHD and Dyslexia.

Percy walked through the empty halls and followed the directions he had received to his classroom. When he arrived, he was 20 minutes early to class. He sat down and took out a textbook, waiting for the other students to arrive.

At 10 minutes before class was set to start, three girls, evidently other students, entered the classroom together. Percy looked up and took in their odd appearances.

The first one had heavily styled black-with-white-streaks hair. Her skin was...wait, was her skin green? Percy figured it must be a trick of the light. Or maybe body paint? Huh, weird. She was wearing earrings and had several tattoos of stitches all down her body. She was wearing a blue blazer over a crisp white shirt, and a mid-length blue patterned skirt.

The second one was a bit more normal-looking, but still very made up. She had white skin black-and-purple-streaked hair styled into pigtails. She also had earrings, but no tattoos. She was wearing a frilly blouse and a medium-length skirt, this one pink.

The third girl was the most normal-looking of the bunch. She was brown-skinned and wore her brunette hair in a long curly mane, with only a few purple streaks. She wore a green T-shirt with a black jacket, and patterned purple jeans.

The three girls were conversing happily about something that had happened the previous night. Having taken them in, Percy turned back to his book. These girls were already clearly part of their own clique. His high school experiences up to now told him that these girls would have no interest in talking to him, and he was not about to attempt it. Better to keep reading his textbook.

"Hi, I'm Frankie, what's your name?"

Percy looked up. The green-skinned girl was twisting in her chair to face him, looking at him with a friendly smile. He was a bit taken aback, but he quickly recovered. "Uh...I'm Percy. Nice to meet you," he said after a second, smiling back. "I'm new here," he added.

"Yeah, I thought so," she said cheerily. "I know most of the monsters around here pretty well. I used to be new here myself not that long ago, actually. Don't worry, you'll fit in just fine. Welcome to Monster High!"

Wait, did she just say monsters? Ah, so the school was called Monster High. That must be why. Must be a term for the students here.

Anyway, normally such a name would cause Percy Jackson concern. As a half-blood, Percy had already had several encounters with monsters. The monsters that Percy knew were evil bloodthirsty creatures that preyed on humans, especially half-bloods. But these girls seemed nice, and perfectly ordinary. (Well, near enough. Not evil or bloodthirsty anyway.) Must be just a coincidental name, Percy reasoned.

The green-skinned girl went on to introduce her friends. "This is Clawdeen-"

"Yo," the brunette girl said, raising a hand in greeting.

"-and Draculaura."

"Nice to meet you," the black-and-purple hair girl said. Now that she was looking at him and speaking, Percy noticed she had an overbite.

"Hi," said Percy, looking at the other girls and smiling nervously. They were weird, but nice. Maybe this school would be different.

Clawdeen had taken out a small mirror to touch up her makeup, and Percy ended up glancing at it. As he did so, he caught a glimpse of something. An unmistakable, green, slithering something...

"Ah, gorgon!" Percy yelped. He reached into his pocket and withdrew what looked like an ordinary ballpoint pen. He deftly uncapped it, and it immediately transformed into his sword of Celestial Bronze, Riptide. "Everyone close your eyes!" he said urgently. He held out his sword in the direction of the hissing as he pulled out his own mirror from his backpack.

"Now, hold on!" a female Egyptian voice said in a somewhat panicked tone. "Um, take it easy, and could you please stop pointing that sword at my boyfriend?"

"Yeah dude, it's okay, we're all friends here. Just chill." This time it was a male voice speaking.

Looking out of the corner of his eye, Percy saw that his new friends were looking at him strangely. He finally dug out his mirror and looked in the direction where he had heard the hissing, and most recently, the new voices.

What he saw surprised him. There was a girl with dark skin dressed in bandages. That must have been the female voice he had heard. Beside her was the gorgon he had caught a glimpse of earlier. Only, he didn't look like any gorgon Percy had ever seen. Rather than being ugly, he was a handsome high school boy in his late teens. What was more, the girls were occasionally glancing at him, and not getting turned to stone.

Could this me a trick? Percy mentally ran through all the mythical creatures he knew, but he couldn't think of one capable of causing anything like this. Finally he decided that if there was something capable of fooling his senses this completely, then he was already doomed. He reluctantly lowered his sword.

"Um, could someone please explain to me what's going on?" Percy said uncertainly.

"Actually, I think we were rather hoping you could tell us," said Frankie, looking confused. "And why you're carrying around a transforming sword with you."

Just then the teacher walked in. He had grey skin and sandy hair, and he was wearing a brown coat. His expression was stern and no-nonsense. He saw Percy's sword and started.

"Young man, no weapons at school!" he exclaimed. "Put that sword away at once! And keep it sheathed, or I shall have to send you to the headmistress' office."

"Please do," said Percy weakly. Maybe they would have some answers.

This was hardly the first time that Percy had been sent to the principal's office. He waited outside the office as his teacher explained things to her, before leaving to go back to teaching his class. "Enter, Mr. Jackson," said a crisp female voice. Percy did.

Percy closed the door behind him and faced the desk. The headmistress was resting her head on her desk as she looked at him. Stranger than this, however, was the fact that it wasn't attached to her body. The headmistress was headless. This struck Percy as being rather ironic, and he would have found it extremely funny if he wasn't so worried about being expelled.

The headmistress fixed her eyes on him. "Hello. You must be Percy Jackson. I have been informed you recently transferred in. Allow me to formally welcome you to Monster High. I am Headmistress Nora Bloodgood. Now that that's out of the way, your teacher has told me that you drew a weapon in class and pointed it at another student. Can you kindly explain why, Mr. Jackson?"

Percy awkwardly explained how he he had been attacked by Gorgons before, and he had assumed that his life was once again in danger. He promised that it wouldn't happen again. He waited nervously for her response.

Headmistress Bloodgood had listened to his story with attention and surprise. She now adopted a serious expression and lifted her head up onto her neck. "The fault is mine Mr. Jackson. I had assumed that whoever had put your name down had explained to you how this school operates. Please allow me to explain."

The woman explained to Percy that the school was a school for monsters where they could learn with others of their kind without the prejudice most humans in this world had for monsters. She further explained that this was not the world that Percy was from.

The school, she explained, had access to a portal that allowed them to several different dimensions. The portal was most often used to get to a sister school called Ever After High, but also led to, among other things, Percy's dimension.

The school had recently begun looking for exceptional students from different dimensions. One of the staff visiting Percy's dimension had met his mom and put in an application for him. Once the woman was done explaining, she asked Percy whether he understood, and whether he had any questions.

"Okay, I think I've got it," Percy said slowly. Strangely, this wasn't the weirdest thing that had ever happened to him. Probably one of the top ten though. Maybe #5 or #6? He'd check his list when he got home.

"So, about my sword," he said as a thought occurred to him. He pulled Riptide from his pocket, where he had stowed it again in the form of a pen. He uncapped it and it once more transformed into a sword. "Everyone here can see it right? As a sword, I mean." In Percy's world, a force called the Mist prevented most people from seeing Percy's sword as it really was. But that girl had clearly called it a sword earlier.

The headmistress held out her head to get a closer look and peered at the sword. "Yes, I think so. I can't speak for the others, but I see a bronze, shimmering, double-edged sword, with leather wrapped around the handle, and...oh my, what looks like gold. Is this unusual where you are from?"

"It's, uh, very uncommon," Percy said. So apparently the Mist didn't work on the residents of this school. Interesting. He didn't know whether this was because they could see through it, or whether the Mist just didn't work in other dimensions at all. Something to look into.

"At any rate, I am going to ask you to keep it sheathed- er, capped, while you are attending here. I promise you that you will be in no danger. Do you have any other questions, Percy?"

"No ma'am," Percy said, capping his sword.

"Then you may go to your next class." Headmistress Bloodgood smiled slightly at him. "It was nice to meet you Percy. I would like to apologize for the mixup and I hope you will feel welcome at Monster High in the future."

"Thank you ma'am," Percy said before leaving the office. He was pleasantly surprised at having left the principal's office without a detention for once. Thinking his new principal was pretty nice, he checked his schedule to find where he needed to go next.

Percy left the office in time to make it to his next class of the day, Mad Science. That was another thing about the school. All of the classes had weird names, but as far as Percy could tell, they were roughly equivalent to normal high school classes, in this case science class. Not that Percy had ever learned much in normal classes anyway, so he didn't really care.

After a few more classes, it was time for lunch, which was thankfully normal. Percy was worried that the cafeteria food, being made for monsters, would be some unusual, gross, inedible substance. But it turned out to be just regular cafeteria food. Which was to say, it was a gross, inedible substance, but of a completely usual kind.

At lunch, Frankie waved Percy over to sit with her and her friends, which Percy did so gratefully. Now that he took a closer look at them, he realized that a lot of the features he had noticed before were actually monster traits. Frankie's stitching tattoos were actual stitches. Draculaura's overbite was vampire fangs. Clawdeen's brown skin was actually fur.

In addition to the three he had met in class, Frankie introduced him to a girl named Ghoulia, who was a zombie. They were all curious why Percy had freaked out and what he had talked about with the headmistress. Percy explained who he was and what his dimension was like, to general astonishment.

"Wow, that's...bizarre," Frankie said softly. "So the, um, monsters back where you're from. You've never had them not be trying to kill you?"

"Yeah, pretty much," Percy said.

Ghoulia opened her mouth and moaned. Percy didn't understand her, but the other girls clearly did.

"Ghoulia's right," Frankie said. "If that's what you've went through, it's totally understandable that you panicked. I can promise you though, Deuce is totally harmless. That's his name by the way, the gorgon."

"Ah, thanks. Speaking of which, I have some questions about the monsters in this universe. In my universe, gorgons all turn people to stone when you look at them. Does Deuce not do that?"

Frankie shook her head. "No. Well, he does turn people to stone, but he has to be looking directly at you. That's why he wears those sunglasses all the time."

"Ah," Percy said. That explained that then.

They talked a bit longer about unimportant things, and Frankie invited him to hang out with the Maul (their way of saying the mall) with that coming Saturday. Percy told them he'd have to see if he could get transportation. He was pretty sure that an alternate dimension was outside of the service area of most New York taxis.

Before his next class, Percy used the school's phone to call his mom in his home dimension. He told her about the situation, and asked to make sure he could go to the Maul on Saturday if he found transportation.

"Well, um, yes, I suppose that's fine," Percy's mom said, still sounding a bit dazed. "So, um, Percy...this is good news, isn't it? I mean, it sounds like you're making friends, right?"

Percy thought about this for a few seconds. "Well...yes. I never thought I'd say this but...I like this school. I like my teachers. I like my classmates in general. Things are...good."

"I'm so glad to hear that Percy," his mom said, her voice full of emotion. "Well, my lunch break's almost over. I need to get back to work. See you later Percy."

"Bye mom." Percy hung up the phone and just stood there, trying to process his emotions. He didn't have long however, for just then the bell rang, and he ran to make it to his next class.

A/N:

Well, this is my first piece of writing on this site. Interestingly, it is also the first Monster High/Percy Jackson crossover on the site. I thought it would make for an interesting crossover, with the different takes on Greek mythology and the common children of mythical beings theme. I certainly had fun writing it, and I hope you enjoyed reading it to. I might write more chapters if I have time, I have some ideas. I would love to hear what you thought and what you would like to see in future chapters, so please review