This is a request by the core of justice, and it is vastly different from my normal.

For one thing, each Hiccup featured is the canon form to their respective universes. This means Hiccup is male and human, there is no Aric and Astrid (only canon Astrid), and movie Hiccup can't talk to dragons. This is also the first time I'm writing anything featuring the franchise's book counterparts. Yeah, I've had a few references to the books before, like having Hiccup and Snotlout canonically be cousins, Hiccup titling the dragon language Dragonese, and the detail of her knowing a bunch of languages, but this is more than a simple reference.

This is a full on crossover.

Also, note, I did decide to move some things around from the first book in order for this to work.

Nevertheless, I hope you enjoy!

Note: So names don't get confusing, I decided to differentiate by capitalization. Capitalized names are the movie characters, whereas non-capitalized names are the book characters unless specified.

This Isn't Berk:

Flying through the skies with Toothless, Hiccup breathed in the crisp cold air of winter. He loved the lulls in the season, when the sky was clear, yet snow frosted the ground. Yes, it was cold, but Hiccup rarely ever felt it in the place he felt most at home. Hiccup and Toothless were out on their morning flight, the troubles of days prior long behind them.

Mildew had almost succeeded in getting rid of their dragons for good. If it hadn't been for Alvin, Hiccup wasn't sure if he would have been able to get Toothless back. He still had no proof of what Mildew had done, and he doubted he ever would, but that was the furthest thing from Hiccup's mind at the moment. For now, it was just him, Toothless, and the open air.

Toothless dove into the forest, Hiccup leaning forward in the saddle, and they wove through the trees with ease. That was when Hiccup noticed the cliff-face ahead, the duo coming in hot.

"Toothless!" Hiccup exclaimed, yanking on the reins as Toothless reared in an attempt to stop. They couldn't stop in time, but looking right there was a cave carved into the face, and pulling on the reins, Toothless swerved into the cave, before pulling to a stop.

Hiccup breathed a sigh of relief, Toothless seeming just as relieved as he panted.

"That was close", Hiccup voiced as he slid out the saddle, and Toothless shook like a dog that'd just come out from the rain. "I don't remember this cave being here, though."

Toothless seemed to cuff in agreement, looking around.

It was odd. They flew the same paths every morning, alternating between variations day to day, and there had never been a cliff-face, nor a cave, in this spot. It was as if it had just appeared overnight, but that was impossible. Had they veered off course?

Toothless made a crooning sound, and looking over to where his best friend stood, looking up at something, Hiccup got this strange feeling, like the one that said you'd stumbled upon something you shouldn't have.

Over on the back wall, etched into the stone, was an inscription. Toothless looked back at Hiccup, a questioning look on his face as Hiccup walked towards it, questioning it himself. What Hiccup did next was something he knew he probably shouldn't have, the cave's oddity a large red flag in all this, but he did anyway.

"Two worlds shall forever collide, until one wrong can be set aside", Hiccup read, and immediately paused. "One wrong?" he mumbled. What was it talking about? Two worlds made him think humans and dragons, him and Toothless, but it said they would collide only until a wrong was righted, not the other way around, so that couldn't have been it. But then…what worlds?

It was then a horrible buzzing filled Hiccup's ears, a disorienting bright light quickly following which blinded his eyes, before there was a sudden weightlessness like he were free falling with no rush of air to remind him he was there. Which way was up or down he didn't know, where ever Toothless was he couldn't say. All Hiccup knew in that moment was a sense of sensory overload and deprivation all at the same time, and as quick as it started, it stopped. Suddenly he was back on solid ground, the cave exactly as it was before with only the quiet sounds of the forest to fill it.

Coming back to himself, Hiccup found he was panting. Beside him, Toothless was rising from the ground, having somehow fell from the time all of that had started and ended. He looked to Hiccup, looking just as shaken up.

"Let's get out of here, bud", Hiccup said, fear coating his words, and wanting to get out of that cave as soon as possible. Whatever that was, he didn't want to experience it again, and they needed to get to the academy for training anyway, but when they got outside, things only got weirder.

The ground was soft.

As soon as Hiccup's boot and prosthetic met the ground outside, he was met with a far more muddy terrain than he was used to, his metal foot sinking.

"What the―?" he expressed. The ground should have been frigid, with a light coating of frost or ice, not wet and muddy. "It's not supposed to rain for three more months." Berk was just far too cold for that this time of year. Rain didn't usually grace them until mid-spring. Not to mention the skies were clear when they'd entered the cave, and now they were clouded, as if threatening more.

Turning back around towards the cave, Hiccup's confusion only grew. The cave was gone, nothing but a cliff-face before him.

"Something's wrong", Hiccup voiced, then hopped onto Toothless and took to the sky, needing to figure out what was going on and fast. There were just too many weird things happening all at once for them to be a coincidence. Something was going on.

Hiccup scanned the island, finding nothing off about it, aside from the strange weather. That was until the village came into view, and Hiccup's eyes widened, suddenly veering them into the forest, almost crashing them into the mud.

"I don't think we're on Berk anymore, Toothless", Hiccup said hushed as they landed, still reeling from what he saw. From the architecture, to the layout, it all looked like Berk but the people… It wasn't Berk. "Stay on guard", he told Toothless, and his dragon slowly crept up to the forest's edge, voices slowly making themselves clear. It sounded like a fight. Sliding off Toothless, Hiccup hid behind one of the trees at the very edge of the tree line for a closer look.

I was going to post this as a one-shot story, like how I do single episodes, but it's been taking too long to write, so instead I'm posting it in small chapters. Hopefully that will motivate me to write faster.

It also gives you all some content to chew on after months of silence. I might edit/re-post it as a one-shot once it's all done.