Hello every one! It has been such a long time. Adventurers United! is a three part series about the unity of the original and gender-swapped characters of Adventure Time, provided to you by Cuber the Grayble-Teller himself! Please post honest reviews based on what you think of my story, and enjoy! Is rated T for teen because, you know, Adventure Time was made specifically for teens.

Author's note: These two signs, "~*A*~" and "~*O*~", represents the lands of Aaa and Ooo; this story will take place in both lands for the first half of Part 1.

Disclaimer: I own nothing from Adventure Time.

Chapter 1:

"Through The Looking Glass"

Hoho, why hello my belibble melon wisties, how glad am I to see you again! Here for more Graybles I reckon. Well unfortunately I have none for you today my dear wallaby's; however, I can show to you a magnificently cuwazzling tale about our favorite Adventurers from the Days of Old on my Visualizer Screen! Oh Hoho bleeb dod triod de crimpy, now your in for a treat! Now sit back, relax, and enjoy the feature my flimpin' dopper's! Oh Hoho!

~*A*~

"I'm pretty sure he'll find me here," thought Fionna. "If I don't move now, then he's sure to catch me."

Fionna carefully slid open the door of the closet, stopping each time there was a creak; finally, there is space wide enough for her to squeeze her way out. The room is dark, and just as she is making her way over to hide under the bed she bumped her head on something cold and hard as stone. She knew exactly what she had bumped her head on; Fionna gradually lifted her head to meet the bright, red eyes of the dark figure standing above her.

"Aw rhombus!" Fionna exclaimed.

Suddenly the dark figure reached both of his hands towards Fionna, grabbed her by her shoulders and lifted her off the floor.

"Gotcha!" shouted Marshall Lee the Vampire King in her face.

"Dang it Marshall," Fionna sighed. "It's not fair when you have super senses and stuff, I mean, you can, like, smell me for Grob's sake!"

"Oh now Fionna don't be a sour puss." Marshall teased. "Speaking of which, where's Cake? I've actually been looking for her for like two hours."

"Well I can imagine since she can shrink down and fit into any fluffin' crack in your house that it would be a bit harder to find her than me!"

"Eh, I guess so. Flame Prince isn't even trying to hide at all."

"Maybe because he's afraid to burn your house down."

"Actually I fireproofed the house while I was building it; I know, I'm a genius. Anyways, that's not what I meant, Flame Prince is so good at "Hide n' go Seek" that he doesn't even need to try. I have a junk-load of candles around my house and he hides in the flames. Once he hid in my fireplace, but I had to figure out specifically which log he was burning on. Isn't that rad, your boyfriend's so rad!"

Fionna blushed because she knew how amazing her boyfriend was already. All of the sudden Cake's voice came from nowhere, "Okay I give up!"

"Ouch!" Marshall winced and picked his ear.

"Careful baby, you almost got me." Cake said as she jumped out of Marshall's ear and grew to her normal size.

"Aw what, you were there the whole time?"

"Sweetie I am da-bomb at this game."

Fionna rolled her eyes at her sister and best friend and walked to and then down the ladder of Marshall's bedroom, then she went over to the kitchen to see what was in the fridge. She saw that there was nothing she wanted and lifted her head out of the fridge.

"Hey beautiful." Flame Prince said, casually leaning on the door of the fridge.

"Where were you this whole time?" closing the fridge as she asked this.

"In the fireplace burning the third log in the back."

"I knew you were in there somewhere!" Marshall accused from behind them.

"Hey, can't we play outside, like, in the Candy Kingdom or something?" asked Fionna.

"Marshall doesn't want to because he's afraid of a little competition with me!" mocked Cake.

"Oh your on! Come on guys."

The four friends excitedly ran out of Marshall's home, and to the Candy Kingdom to start a new game of Ultimate Hide n' go Seek!

~Z~Z~Z~

Three minutes later at the steps of the Candy Castle.

"Okay so these are the rules pups'," Marshall explained. "You may go anywhere from the Candy Kingdom and the Cotton Candy Forest; the Verdant Plains around Fionna and Cake's house, and the Mystery Mountains, and the Marshmallowy Meadows. And also you can't shrink, Cake, because it's harder for me to pick up your scent. Now I will count to… a hundred – very slowly; actually no, you all have five minutes. If you are not found within an hour and a half then just meet at the gates of the Candy Kingdom, okay? One, two, three, four HIDE!"

Cake stretched to a nearby tree, shaped herself into a paper airplane, and flew towards the Candy Kingdom. Flame Prince pecked Fionna on the cheek and disappeared into his flame form, while Fionna ran in the direction of the Mystery Mountains.

"I know exactly where to hide!"Fionna thought with confidence. "Marshall will never find me here! He's probably looking for all of us now so I'd better hurry. This is going to be to Geometric!"

She climbed up the Mystery Mountains and finally arrived at her desired hiding place: the Loch of Phantoms. She cautiously skipped through the safe path she and Cake found when they were with LSP and made it to the Mirror Cave. But when she was about to enter, a giant ice lightning bolt hit the ground next to her.

"Hello Tomboy!" the Ice Queen yelled, cackling. "Where are you off to?"

"Beat it Ice Queen I'm not in the mood to kick your cougar butt!" Fionna threatened as she took out her retractable sword.

The Ice Queen screeched and threw more ice lightning bolts at Fionna; Fionna dodged about three bolts before preforming a ninja dive into the safety of the cave. With her sword still in her hand she ran through the cave until she saw a strange glow that grew brighter and brighter, and eventually she found the source of the light.

"Hay it's that portal LSP went through before she got attacked by those mirror-ghost-thingies," thought a confused Fionna. "Didn't we destroy that portal though?"

"HEY TOMBOY!" Ice Queen shouted. "HEADS UP!"

The Ice Queen formed a snowball the size of Fionna's head and launched it directly at her, hitting her in the stomach. The snowball sent Fionna right through the portal!

~*O*~

At the Candy Castle in Princess Bubblegum's lab, about the same time when Marshall Lee found Fionna in his closet.

Princess Bubblegum was working hard and diligently on an experiment when suddenly, "What's shakin' Bonnie?"

"Oh, hello Marci!" Bubblegum squealed ecstatically.

Bubblegum was delighted that she and Marceline were on speaking terms again since that whole misunderstanding about the T-shirt was cleared up. Marceline flew through the open window of Bubblegum's lab and gave her a warm, friendly hug.

"So what are you doing?" Marceline asked casually.

"Nothing in particular, I'm just working on some miscellaneous stuff."

Marceline floated over to Science's aquarium to lift her out and pet her for a while. As she started talking to Science in a baby voice the door of the lab flew open to let in an upset Lumpy Space Princess, who went to go float by Bubblegum.

"OH-MY-GLOB!" she cried. "PB I can't believe you, like – oh hey Marci – totally didn't tell me you had a smokin' hot boyfriend! I mean, like, ugh! If Brad asks me out again I'm seriously, like, not giving you any deats'! So anyways, tell me about him, is he a good kisser?"

"LSP you can't tell anyone who I'm seeing okay!" Bubblegum pleaded.

"But I don't even know who he lumpin' is for crying out loud!"

Bubblegum blushed, looked at Marceline, then back at Lumpy Space Princess, "His name is Marshall Lee, he's Marceline's younger twin brother and he is just a friend, got it?"

"Gasp, and I gotcha." LSP said while nudging her with her elbow. "Wait a sec', Marci you have, like, a younger twin brother?"

"Uh yeah sure," the Vampire replied, scratching her head uncomfortably. "but you seriously need to keep your mouth shut! If anyone knew that-"

"Knew what Marceline?" said Finn and Jake at the doorway. "Oh… and uh – hi can we come in?"

"Hey guys we were just having, you know – girl talk I guess?" Marceline looked at Bonnibel.

"Yeah, we were totally just talking about Marceline's hot bro!" LSP blurted out.

"LSP!" Bonnibel hissed.

"Whoa Marceline you have a hot brother?" a shocked Jake asked and Bonnibel blushed deep pink. "Did I Really just say, 'hot brother?'"

"Um… yeah he's sort of my younger by twelve minutes twin brother."

"Math!" Finn enthusiastically exclaimed. "Does he play the guitar like you, you should totally invite him over sometime so me, you and your brother, Jake, Peebles, and Beemo can jam-out together!"

"Actually Finn he lives really far away, like, really far; and he plays the drums. Plus right now I'm gonna, you know, go feed Schwabl."

"Isn't Schwabl your dead zombie dog?" Jake asked a little confused. "Doesn't that mean that he, you know, doesn't really need to eat?"

"Well yeah… um…well, like, it's because… um yeah, whatever."

Marceline abruptly turned and flew out the window she entered through, then remembered she still had Science with her, flew back in and put her away, then finally left.

"Oh my Glob you guys, awkward sauce!" LSP sang. "'Kay PB I'll, like, see ya' later or whatever. Bubye!"

Lumpy Space Princess glided out of the room, leaving Princess Bubblegum by herself to face Finn and Jake.

"So, uh, Princess?" Jake uncomfortably asked. "Have you seen Lady anywhere, I've been looking for her for awhile and still can't find her. She's been having back pains lately and I don't want her to stress herself out since she's preggers and all."

"She's in the kitchen eating some candy." Bubblegum said, finally composed. "Lady's in that weird emotional stage in her preggercy."

"Okay, thanks Peebles!" Jake smiled, and began to walk out with Finn just behind him.

"Aw fudge!" Bubblegum shouted. "Hey Finn wait up, do you think you can do me a favor?"

"Sure thing Princess, what is it?"

"Well, Marceline was supposed to take these two letters with her, but she... left before I could give them to her; do you think you could catch up with her and give them to her? She's on her way to the Loch of Phantoms in the Mystery Mountains, if you leave now you should be able to catch up with her."

"Whoa! Wait a second PB, didn't you send Jake and I there to destroy those evil mirror thingies? What's she doin' up there anyway?"

"Oh… Vampire magic stuff I guess, I don't know. Well – here you go."

Princess Bubblegum handed Finn two pink letter envelopes tied neatly and securely with darker pink ribbons.

"Fancy!" Finn commented while putting the letters in his pack "Okay then, see ya' later Princess!"

"Goodbye Finn, thank you!" Bubblegum waved.

~Z~Z~Z~

Finn had just past his house about a quarter of a mile back and was nearing the foot of the Mystery Mountains when he heard someone whistling. Finn looked around and saw Marceline flying up the mountain and was already halfway up.

"MARCELINE, WAIT UP!" Finn called.

Just as he called her she suddenly flew more quickly, which Finn thought was very odd. Rather than strain his voice, Finn decided to just run up the mountain instead. He finally got to the top, but Marceline was nowhere to be seen; she was already inside the cave.

"Aw stuff I better hurry up!" Finn thought as he was crossing the safe path he and Jake found. He quickly ran into the cave and noticed a bluish light glowing brighter as he went further into the cave. "What the blizz?"

He finally reached a strange, glowing mirror-like portal; as he continued to stare the mirror rippled. Suddenly something, or someone, knocked into Finn, and there was snow all over him.

"What the hey-hey!" Finn yelled; he stood up with his back facing the portal. "Are you okay?"

Fionna stood up as well, clutching her shoulder.

"Yeah I think so, thanks." As she said this, her eyes locked on his hat. "Hey nice hat, dude!"

"Oh, thanks, your hat is awesome too!" he pointed at her hat. "My name's Finn."

"Hey Finn, my name's Fionna." They were both high-fiving each other as she said this.

Fionna smiled at Finn when something caught her eye. She saw the cold, blue claw-like hands of the Ice Queen reaching through the portal ready to grab Finn!

"FINN LOOK OUT!" Fionna shouted.

"Huh?" Finn was about to turn just as the Ice Queen grabbed him and pulled him through the portal. "OH GLOB!"

Fionna could not grab Finn in time to rescue him; all she could do is stare at the portal as it transformes into a simple mirror.

"NO!" Fionna screamed at the mirror, hitting her fist against it. "He looked like another human!"

So concludes Chapter 1, I hope you like what you have read so far; please review and tell me what you think of the story, I would much appreciate it. Chapter 2 is where the fun begins and will be coming out very soon! :D

- Florence M. Welch