This starts at the end of the House of Hades, and one month after HTTYD 2. And I don't belong HTTYD, PJO or HOO. All credit belongs to Cressida Cowell, DreamWorks Animation and Rick Riordan.

PERCY

Percy Jackson breathed in the salty sea air that was his dad's realm as he walked to and fro from the bow of the Argo II. Gods, he was so happy he was back on the surface, breathing fresh salty air from the crystal blue oceans, not like the poisonous air or the pit of Tartarus, or the waters of the River Phlegethon, the River of Fire. Percy had no intention of returning there and drinking its disgusting, spicy waters.

Tartarus... he looked up at the stars, who he had said hello to for Bob the Titan (AKA Iapetus the Piercer). He and a giant called Damasen had sacrificed their lives for Percy and Annabeth's escape. They wouldn't have been here if they hadn't helped. He sighed, pondering over the recent events. Reyna had came over to the ship to be the Roman demigod to return the Athena Parthenon statue to Camp Half-Blood, assuming neither Gaia or the 'best buddies' from Camp Jupiter had had a fight that destroyed both camps. His two homes destroyed. No... he couldn't think that. He was one of the Great Prophecy (Prophecy of Seven, whatever) to fight Gaia and her sons the giants and stop the destruction of the world. Yes, he couldn't think negative thoughts about something that could bring about he and his friends' deaths.

He glanced over the boat and Leo Valdez popped out of nowhere and as he held his Archimedes Sphere tight he asked, "You know, what really happened in Tartarus?"

"Really? I come back from that demon pit and the first thing you tell me is what happened there. Dude, you don't need me to know. Think... Rivers of Fire that have waters that taste disgusting and spicy, all the monsters that you know creeping around, our old buddies the Titans... Kronos's bros, hanging out. Yep, and there are worse stuff than you can imagine."

"Wait... where are the others?"

"Jason, Piper, Frank and Hazel have retired to their cabins. And we're up here."

"Gee." Percy saw Leo glance around uncertainly. "Right then. Only a bit more until Greece I think." Leo chattered his teeth. "Ugh, Holy Hephaestus, it's cold..."

Festus the dragon head creaked. "Not even Festus likes this! He says... he doesn't like this, like, at all. Great, a cold feeling..."

"Mist? Like, the Mist?"

"I think it's the regular kind, Seaweed Brain," quipped Annabeth from behind. "But its feeling a bit strange... where are we, Percy? Can your powers locate us?"

"Hmmmm..." Percy glanced into the sea. "Fifty minutes, Fifty-six degrees north, 18 minutes, 15 degrees west, yadda yadda."

"I've got the feeling we're too north," said Leo, a hint of panic in his voice that Percy could detect. He pulled out a GPS from his magic tool belt and gazed at the screen. "Holy Holy Hephaestus!" he cursed. "We're straying too north!" Leo ran across the deck. "Do I wake the others?"

"Annabeth, wake up the others," ordered Percy. He hardly had the power to order his girlfriend, so to his surprise, she nodded and headed below deck. Then he turned to Leo. "Valdez, how far are we from Greece?"

"Too far!" The son of Hephaestus complained. "We're heading towards..." then the GPS beeped. "Dang, even this Satellite Navigator can't tell us where we are!"

"What European country are we closest to?" asked Percy. Gods, now they were delayed. He hoped it wasn't too late to stop Gaia and her giants... other wise the Prophecy would mean nothing...

"I don't know! Wait... it says where heading towards some small archipelago close to... Norway? How can we be in Norway? How - far - is - it - from - Greece?" Leo typed it out on the GPS. "36 HOURS? We don't have 36 hours!"

Percy leaned over and checked how far. "Okay, 3329.0 km. That's not that far isn't it?" he joked. "It's just next door."

Thank the gods of Olympus, Annabeth had arrived, with the rest of the Seven. Jason Grace had his Roman gladius out, and Piper McLean drew her knife Katoptris. Hazel Levesque looked uncertain and clenched her spatha, and Frank Zhang was in the form of a pug for a second before he realised and turned back into a human.

"Well," began Leo, "we don't know how, but we're heading towards an island not far from Norway! It'll take a day and a half to get back on track."

"We might not have a day and a half, man," replied Jason. "We might be too late to stop Gaia and her giants-"

"But," interrupted Piper, "we could just go to Norway and find our way back there."

"We might be too late," said Percy. "Besides," he turned around and noticed what looked like a clump of rocks that reminded Percy of Zeus's Fist back at Camp Half-Blood, "we're almost here."

"I feel like an intruder," Percy heard Frank murmur, then turned to the others. "Don't you guys have the feeling that people live here? Like, on the island?"

"Uh, duh, Zhang." Leo pointed at two gigantic statues, holding torches with blazing flames. Those statues were...

"Vikings!" said Piper. "I know! My dad was playing a Viking chieftain in a movie, so we researched on it, like we did for the King of Sparta. I can see houses. I think this is some kind of Viking settlement!"

"McLean's in the movies again," muttered Leo.

"Shut up, Leo," Piper snapped.

"Oh, I don't know," said Annabeth, shaking her head. "I don't know much about Vikings, but what I do know is that they died out about, like, one thousand years ago? There are descendants of Vikings, but not actual Vikings."

"All this talk, and we're here," pointed out Hazel, pointing at the shore. Then she pointed at a bunch of houses on one of the islands.

"Hey if there's anyone in the beach, can we grin stupidly and shout in unison WASSUP?" smirked Leo.

"NO!" was everyone shouting at Leo, and Leo muttered, "Fine, fine, jeez, don't you guys don't have any humour?"

Percy noticed a two dark figures on the shore, and Festus the dragon head firing out a bout of Greek fire onto the beach.

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HICCUP

Night patrol was the last thing Hiccup Horrendous Haddock the Third, Chief of Berk wanted. After a long day, the twenty-year-old deserved some sleep.

When Toothless became Alpha, many of the wild dragons (from his mother Valka's sanctuary) went haywire and started following Toothless everywhere, ending up in the dragons destroying some houses (and making some very angry Vikings).

Then at noon, Hiccup led the gang onto a training session on training dragons, which wasn't easy because of Snotlout complaining about his old 'Baby Bludger' that had been burnt to a crisp by one of the Hobblegrunts and the twins head-butting each other. The only people who seemed enthusiasthic were Fishlegs, who was observing his dragon cards and reciting dragon facts about random species of dragons, and Astrid, who seemed as if she wanted to shut Snotlout and the twins up with the whack of the head. They met some cantankerous Changewings, had a near miss with a Typhoomerang and other dragons. But still that wasn't enough.

Then it was the Dragon Races. Even though Hiccup was the Chief and couldn't play a part in the race, he still played a huge role. After that, half hour patrol. After that, he had went on a flight with Toothless, checking out the wings of his flight suit, and doing some tricks in the air.

Even after all that, Hiccup couldn't rest until he finished an hour of Night Patrol. He and Toothless had retreated to Thor's Beach, to wait until it was finished, and he could retire for the night.

"Toothless!" Hiccup called his best friend. The Night Fury ambled up to him lazily and curled up to sleep next to Hiccup. Hiccup sighed and sat down and watched the night stars and the constellations in the sky. Suddenly, Toothless woke up, his eyes snapped awake and alert, sniffing the air.

"Toothless, bud? What's wrong? Anything out there?"

Then Hiccup heard a group of voices saying "NO!" and then a bout of green fire erupted onto the beach. Toothless fired back three plasma blasts. Is it a dragon? thought Hiccup. No... it's a boat.

It was a huge colossal boat, and the dark shapes meant there were people on the boat, a small group maybe, as big as Hiccup's own gang. Hiccup gave a small gasp - there was a large dragon head breathing fire on the mast as the boat's masthead. Then he realised (with relief) that it was bronze. (He'd thought they were dragon killers, like the Dragon Hunters he had run into not so long ago.)

Suddenly, the dark shapes jumped out from the boat, and Hiccup quickly counted seven of them. He couldn't see them in the dark properly, but he knew they were all carrying weapons. Why was one boy holding a glowing bronze sword? And why was another boy... with flaming hair? What in Valhalla?!

They're attacking, was Hiccup's first thought of them. What if they're Berserkers, maybe? Or Dragon Hunters, or... in Drago's army? Damn... they're a threat. First things first... what do I do?

Then, Flaming Hair Boy grinned stupidly and said to him, "WASSUP?"

"We told you not to say that, Mr Flame Man!" said the boy with the glowing sword.

"Fine, Sir Aquaman," Mr Flame Boy grumbled. He cupped his hands and flames of red hot fire danced on his palm.

Hiccup gaped. "How did you-"

"Maybe he's an enemy," said another boy's voice.

"Oh, I don't know," said a girl's voice. Hiccup squinted in the darkness and noticed that she held a golden sword. "Maybe..."

"He's a mortal come back through the Doors of Death!" Mr Flame Boy yelled.

"That means..." said Sir Aquaman. "His patron is Gaia!"

"And look! He's brought a beastly beast with him!" A large stocky shadow in the darkness pointed at Toothless, who snarled. Hiccup held his hand back at Toothless, telling him not to move. "You don't know what Toothless is capable of. You're part of Drago Bludvist's army, aren't you? You're trying to spy on us!"

Sir Aquaman held his glowing sword higher. "Don't talk like that. You're one of Gaia's servants, aren't you? You're helping her rise."

Who in Thor's lightning hammer was Gaia? She or he seemed evil. But maybe these people were using one of the oldest tricks in the book - letting their enemies talk and then they attack.

" That guy and his... creature are part of Gaia's minions?" asked the girl with the golden sword.

"In that case," said Mr Flame Boy, "Queen Dirt Face's evil minions are going down! You're going down, down, down..."

"It's not the time to sing, Valdez!"

"Fine," replied Mr Flame Boy/Valdez. "But still..." Mr Flame Boy/Valdez pulled a hammer out of his tool belt. His hair had stopped burning now, but it still gave Hiccup the freaky-deakies. Sir Aquaman brought out his sword and lunged. With one quick move, Hiccup took out his sword and activated its flaming blade, then he parried the lunge. Mr Flame Boy/Valdez looked at him with glee. "Dude, that's sword is wicked. How did you-"

"Valdez, he's working for Gaia."

"Right."

Sir Aquaman stepped forward and they began a sword duel. They lunged, parried and slashed. Odin's beard he's good! Hiccup thought as he nearly missed a huge slash. Then a blonde haired girl with a sword that looked like... bone? stepped forward and helped to fight. The rest of the group joined in. "I told you," Hiccup said, "I don't know who this Gaia is! You fight so well, you could be working for Drago... You know what? Toothless, show 'em what ya got."

Toothless let out a plasma blast that would've blasted Mr Flame Boy to pieces. Instead, he got up and said, "Dude, so cool. Do it again!"

"How could you-" Hiccup's voice wavered away when Mr Flame Boy cupped his hands again and let fire dance on his palm once more. "Our turn." A boy with a golden sword and a girl with a bronze knife stepped forward. The boy began to duel with Hiccup as he called, "Frank! The plan! Bring Hazel with you!"

"Got it!" The boy named Frank answered. Suddenly, he disappeared. Hiccup didn't know how. Who were those people? A boy who could summon fire? Another boy who could disappear? How?

Before Hiccup got back to his senses, he felt his sword get knocked out of his hand, a roar that came from Toothless, and a bonk on the head before he passed out.