Finn and Jake in:

The Mountains of the Moon

A/N: This is my first fanfic in a while and my first AT one. So be gentle in the reviews, I'm sure it sucks a lot :P You know the rest, I don't own this mang

EPISODE I: What Time Is It?

The hill was green and gently slopping as the clouds passed overhead, a gentle breeze carrying the seeds of dandelions across the grassland. Peacefully clouds overlapped and birds flew through them, and a tree fort stood in the distance.

"What time is it?" a 16-year-old boy yelled as he ran up and over the other side of the hill, starting down the gentle slope. He wore a blue shirt and a white hat that made it look like he had no neck, bits of blond hair coming from under the hat and down his shoulders just a little. Under his green backpack was a deep red sword made of demon's blood, and at his side ran an orange-brown dog.

"Adventure time!" the dog laughed as his legs stretched as he ran, before Jake swung up in a single leap to land on the dog's back, the dog growing to take the size of a horse.

The boy was Finn the Human, the last living human on Earth, making his home in the grass lands of Ooo. His best friend was Jake the Dog, a magical dog with the ability to stretch his body parts into any shape, form, or length.

"So where are we going today, Jake?" Finn asked as the dog slowed down as the two began up another hill, leaping over a stream.

"Lady said that the Candy Kingdom and Fire Kingdom were having a big meeting today, I think we should head there."

"Aw, man, really? It's not like there'll be anything adventurous there..."

"No, but Flame Princes will be there, buddy."

Finn's face turned red and he didn't say anything as Jake laughed. "Glob, you two are serious. Well, at least you act like you two are. How's those burns doing?"

"How'd you know about those?" Finn asked, and Jake laughed again.

"I didn't, haha."

"Jake!" Finn yelled, but sighed and laughed. "Yeah, well... whatever. So where's this meet up at?" Finn asked, Jake's running across the land of Ooo faster than just him running at normal size.

"Should be just over this hill in the Valley of Kings," Jake said as the two reached the top of the hill, and seeing a sudden cliff. "Whoa!" Jake yelled, hitting his feet into the ground as he scrambled to stop, his back legs stretching to wrap around some rocks. Finn nearly flew off of Jake but he felt Jake grab him, as they looked down and into the valley.

It had, in the past two years, become the border of the Fire Kingdom and Candy Kingdom after a series of earthquakes, forming the great valley. Now it was a rich ecosystem with a river flowing through it, birds and trees growing out of it, in the center a great island with a palace built of strange material.

"Now that looks amazing," Finn said as Jake let out a whistle, starting to climb down the cliff face with his legs stretching to stable rocks, before there was a deafening roar.

An explosion rippled out from the palace where the meeting was, Jake and Finn helpless as they watched in horror the flames spreading out, Flame Kingdom representatives fleeing as the palace began to collapse, Candy People panicking and carrying paperwork to safety as a blimp over it was quickly boarded by some figures, presumably Princess Bubblegum and the Flame King and Flame Princess.

"Jake we have to help them!" Finn yelled and Jake nodded righteously, bounding down into the valley and stretching to make his way to the island as fast as he could.

Finn leaped off of Jake as they reached the island, pulling out his sword and looking around the fiery ruins of the island and the palace, a great stone pillar falling as he raced into it. "Is anyone still inside?" Finn exclaimed as he leaped over the pillar, Jake behind him.

"Finn, slow down, bro!"

"No way, man, there might be people inside who need help!"

As Finn entered the ruins, he found the rooms empty, until bursting into a great throne room, finding Peppermint Butler on the ground, struggling to escape from the weight of the debris on him. "Peppermint Butler!"

Finn raced towards the big peppermint in a butler outfit, and the peppermint looked at him. "Finn..."

"Don't worry, we got you!" Finn announced as Jake helped him push the debris off the candy person, who just looked up at them, pulling a paper from his sleeve.

"The..."

He closed his eyes and collapsed, and Finn just sank away for a few moments.

"We didn't save him..."

"Yeah... hey, what's this paper?" Jake asked, and Finn looked towards the paper in Peppermint Butler's hand still, taking it gently.

"It's some sort of... map."

"A map? Of what?"

"I don't know, man."

Finn unfolded the map, and looked at it somewhat confused. "This map is really weird, Jake. I can't find the Candy Kingdom on it..."

"Me neither, man. What's it of?"

"I don't know... hey, that says Ooo!" Finn pointed at "OOO" before pausing.

"No, man, that's just three zeroes. Looks like it's in some kinda funky code. Maybe it has something to do with what happened?"

"I don't know..." Finn said, his voice trailing off as he folded the map in half and looked up. "But I will find out whoever, or whatever, did this and bring them a heaping serving of justice!"

Jake shrugged, before a flaming piece of wood fell through the ceiling above, reminding the two of the situation around them. "We should probably get outta here, man!"

Finn nodded, looking around one last time. "Yeah. It doesn't look like there's much for me to do now..."

"Except run!" Jake yelled as he grabbed Finn, pulling him out of the way of another falling beam. Finn ran the moment the magic dog let him go, the two racing as fast as they could to the exit, before there was a scream for help.

"Jake, we have to find whoever let out that scream!" Finn declared, Jake mumbling under his breath about how he was more concerned about not getting burned by the falling debris, and Finn started up the staircase, leaping through a doorway into a library of ancient tomes.

The door slammed shut and Jake hit against it with an audible thud, Finn realizing he had been duped by whoever had let out the scream almost instantly. "Who's there?"

"Finn, are you in there buddy?"

"Yeah, I'm fine Jake! I'll meet you outside!"

"Got it!"

Finn heard Jake leaving, and he looked around the room. "It's me and you."

A shadow seemed to move in the corner of his eye, and Finn turned to see it full-on, only finding more flames around him. And then with an oomf! he was on the floor, a being holding him down. "Oh, my hero. The Slayer of the Lich, Hero of the Grasslands. Whatever would you be doing if it wasn't for your luck?"

"What the stuff, man? Who are you?"

The being laughed and turned Finn's head, while pinning his body down never the less. "Don't you recognize me, hero?" it asked softly, and Finn looked up to see the humanoid figure enshrouded in black. "Oh, my bad. It's been so terribly long... Almost seventeen years now, hasn't it?"

"I'm only sixteen, man, just let me go already, who are you!" Finn struggled and pushed, but the person on him held him effortlessly.

"In due time, hero."

Finn felt himself released, and the being was already half way across the room as he got up. "Take this!" Finn yelled, pulling his sword and lunging through the air at whoever it was. Clearly a man, but of what species or race he had no idea.

The man turned and swatted the sword from Finn's hand like it was a mere play thing, and grabbed Finn's arm with his other hand. "Ah-ah-ah, naughty boy. I thought heroes were all about honor and chivalry. I was, after all, fleeing."

"You're clearly not someone who cares about honor or chivalry," Finn protested, followed by the man laughing.

"Et, Finn? Facit honorem vere materiae?"

He threw Finn back, and turned. "When the time comes, we shall meet again, hero. Until then, farewell."

Finn lunged through the air with his foot now, but a flaming piece of debris fell right in front of him, his foot hitting it and him pushing off to avoid getting burned too badly, and he landed crouched, his hands on the ground and the man gone. "Glob, that guy was weird..." he muttered, standing up and running to his sword. "I wonder what he said..."

Finn lifted his sword and put it back, racing towards the window and looking down. "Jake!"

The dog was on the ground, looking up at the room and saw Finn, and nodded, his body stretching into a trampoline as Finn jumped, the boy falling, falling...

Boing!

He bounced back up just as Jake grabbed him, putting him on the ground and looking around. "Where's the person who screamed?"

"You mean you didn't see them leave?" Finn asked, and Jake shook his head. "Then where is he...?"

"Hey, Finn, you did find them right?"

"I did. Jake, whoever it was attacked me and said something – I don't know what, but he felt really odd, really familiar."

"You don't remember what he said? Was it something like 'Oh, Finn, I tricked you!'?"

"No, man. It was weird. Like, 'et finn, honorem matteriae?' I think. And then he said that we'd meet again and left."

Jake nodded his head slowly, and shrugged. "I got nothing, sorry."

"Then it looks like we have to figure out this mystery."

Finn and Jake stood there, the great building collapsing completely now, the fires in it warming the island by several degrees. "Let's go home."

Finn nodded, the two walking towards the water, Jake stretching to lift Finn onto his back as he grew, his legs stretching to the bottom of the water around them to reach the cliff face, where he'd stretch to climb it with ease.

Something about that man just wouldn't leave Finn's mind though as he looked back at the burning ruins, and he sighed. Jake didn't hear the sigh though as he whistled to himself, making his way up to the top of the cliff face once more.