A/N. So, this is my first story on after stalking this site for over a year. I noticed that there weren't any PJO/HTTYD crossovers like this, so I decided to write this. And I just started school a week ago, so yay! Inconsistent updating! Great timing, right? I WILL try to update consistently though, but feel free to pester me with PMs if I go two weeks or more without updating. You know, if you like the story.

Disclaimer: I don't know why people even do this. I mean, Fan FICTION, right? But, oh well, why not. I do not own Percy Jackson, that honor goes to Rick Riordan. And, of course not HTTYD. Dreamworks and the AMAZING Cressida Cowell have that right.

It was a cloudy night, with mist cloaking the area around them, but Percy wasn't too worried. His nautical senses always told him exactly where he was, so he knew that the ship wouldn't steer off course.

Percy was on night watch with Leo. The crew of the Argo II had decided early on to always have at least one person up and on the top deck to look out for any monsters that might try to eat them. Or kill them. Whichever came first, really.

Percy sighed. It was late at night, and they had just relieved Frank from his shift, so Percy was still half asleep. Leo, however, was as ADHD as ever, fiddling with a telescope he had made out of aluminum foil and a piece of broken glass. Don't ask me how, but the guy actually managed to make it work!

"Percy," Leo groaned. "Can your magical sea powers move this fog? I can barely see three feet in front of me. Plus, I really want to test out this telescope," he complained.

Percy sighed, still half-asleep. "No, I can't move the fog. And, don't you already have, like, a really powerful one designed by yourself and made out of Celestial Bronze right over there?" he asked, nodding to about ten feet to the right of them. Well, he thought it was ten feet. He wasn't really sure.

"Well, yeah, but I still want to see if this one works with further distances than just the other side of the ship," Leo said stubbornly, still fiddling with it.

Percy suddenly tensed up. He felt like the sea had shifted some how, like they had just been thrown into a different ocean.

Just then the fog cleared up, giving both of the half-bloods a clear view of the Atlantic Ocean. There, quite a distance away but still close enough to be noticeable, was a small island with a couple of mountains, one much bigger than all the rest.

"Leo," Percy hesitantly said, "I think we may have gone off track a little."

Leo got up to go look at the controls.

"You know, I think you may be right. The map says that we're in the North Atlantic, close to Norway."

"So, we're WAYYY off course," Percy stated.

"Yep."

"And we have very little time left to get to Rome."

"Yep."

"And we have no idea what's in these waters, since the Greek's influence didn't get up here as mush as the rest of the world."

"That about sums it up, yes."

"Fantastic," Percy groaned, rubbing his face.

Suddenly, there was a series of beeps from the controls. Leo looked at the screen, then up towards the sky. "There's something up there. The radar just picked up a large object flying around the Argo II," he hissed, then nodded towards the ballistas. Percy followed, taking a position to the right of Leo, and squinting through the sight. Leo saw something, a shadow, pass over the stars, and fired.

The shot missed, however, and the creature retaliated. Not fifteen seconds after the missed shot, Percy and Leo heard a high-pitched shrieking noise. A bolt of blueish fire hit the side of the Argo II, severely damaging the oars. The two half-bloods looked at each other, then started firing at anything they thought was moving, pausing to stop and reload.

A/N. So, what did you think? This is my first story ever, so some of the characters might be a bit OOC.