If you didn't know what those things were that attacked and kidnapped Fionna: they were the very same monsters that Simon and Marcy were running from. They're in that city right now, Fionna and Charlie are. Just a little nod to the amazing and heartbreaking episode.

Still taking song entries. I just got an amazing one for Charlie that will come up in a few chapters. It made me so happy to see.

And I'm glad so many people like Charlie! That also makes me happy to see that you're all liking my OC. He's pretty awesome. And in this chapter, it's his time to shine!

Disclaimer: I don't own Adventure Time or its characters.

With a loud splash!, Charlie landed in the old, gunk-filled water of old and resurfaced, coughing and gagging at the rusty taste that invaded his mouth. He got up out of the sewer line, the Family Sword, which had repelled the sludge, still in hand. He shook his head wildly to get whatever disgusting thing in his hair out and then proceeded down the dark passage. The good thing about the the ooze that leaked out of the monsters was that it glowed so Charlie was able to follow it with ease. Once or twice it trailed off in circles but he always found his way back. He was listening hard for any sound of Fionna struggling so he could find her. But the only sounds he heard were the dripping of the slime on the roof of the sewer and the distant sound of mutant mice running along the pipes.

He was mumbling incoherently to himself, trying to calculate this little task. Trying to figure it out logically. Fionna had been telling him sometimes logic wouldn't be able to solve problems on an adventure. That sometimes just going with your gut was a better alternative. But Charlie was having a hard time accepting that fact so he kept drawing a map in his head, running into dead ends, swearing in old, and kicking the walls. He would back track and take another route.

Meanwhile, Fionna was coming to. Her vision was still fuzzy and her back felt wet and sticky. Green ooze was slugging down her arms and was stuck to her back and legs. She deduced that she was attached to either a wall or ceiling. She tried to shake her head to focus but the back of her hat was covered in the ooze too so she couldn't. Finally, her vision was able to clear a little and she found herself in a large room, a main sewer area. The roar of a gross waterfall was heard to her right a few pipes down and a few of the monsters were lumbering around, groaning to one another as if they were speaking. Fionna squinted, trying to get a better view of them. What in the heck were they? She tried to think but her head started to hurt. She moaned in pain and the two monsters turned. They mumbled to one another and scrambled off.

Fionna took in a big breath and tried, with all her might, to awaken her will to scream. She had a knack for being loud and her scream was said to travel across Aaa from her home to the Candy Kingdom. So, she started to yell out but a sticky, green hand clamped over her mouth. The ooze was silencing her! She struggled but it fought back, making her sink deeper into its essence. She screamed muffled screams and struggled evermore. She was able to free her leg for half a second before the ooze shot forwards and engulfed her entire leg inside. Fear rose into the pit of her stomach and tears filled her eyes but she kept fighting. But it seemed to be draining her energy and she became weak. She was slowly starting give up, rest, and try again. But would she be able to try again?

I can't, Fionna thought desperately, her eyes starting to close and the ooze pulling her in.

You can, spoke a familiar voice. Fionna froze, almost feeling cool hands on her cheeks. Almost hear familiar snickers in her ear, encouraging her to go on. Or are you too weak? I thought Fionna the Human never gave up. Not my Fionna, anyway. Give in, then. If you don't have the strength.

Never! Fionna thought angrily, her eyes shooting open. The voice faded and she swear she could see a familiar smirk in the shadows. She pulled her head forward, her mouth opening and she started to scream into the ooze muffler. The green stuff was starting to unstick from the back of her head and she got her face free, her scream blasting like a siren through the entire sewer. The green stuff grabbed her again, silencing her.

But too late. Charlie had heard Fionna's cry all to well. It was still echoing so he dashed off to find her, following the dying echos. Two of the monsters were waiting for him, the ooze dripping from their mouths and three eye sockets. Charlie gritted his teeth as he lunged forward, slicing one in half and punching the other one, using everything Fionna had taught him. When they were defeated, he turned a corner and looked through a grate to his left. He found something that chilled him to the bone in terror. His eyes went wide and he slowed. Fionna was right up ahead, he knew that, but this was... this was just too horrible.

It was nearly an entire army of the things were trudging along the sewer a level below him. They were following the sound of Fionna's scream but still had entire level to clear. Gulping and sweating, still damp from his leap of faith, he ran towards his companion, pushing through a disgusting waterfall and found Fionna trapped in the slime, trying to get out.

"Fionna!" he yelled.

Her eyes turned towards him and she let out a muffled, "Charlie!"

With a battle cry he picked up from her, he sliced through the ooze, cutting through the thick green deeply. It began to sizzle and shrink. The demon blood obviously had an effect on it that it dissolved. Charlie kept slicing through it until Fionna fell off the wall and collided with the floor, weak and wobbly. Charlie rushed over and helped her to her feet.

"There are more coming," he said to her, putting her arm around his shoulder and supporting her by her waist. "I dunno what they want with you but we need to get out before they get here."

"Yeah. That'd be nice," Fionna said, smiling numbly.

They pressed on towards the exit, Fionna basically dead weight on Charlie's side. He was sweating again and the smell of raw sewage was starting to reek. Neither of them minded and tried to ignore the stench. They slugged through the passages and tried to avoid the sounds of the monsters, who were trying to find their newest prey. Charlie was able to navigate their way to the manhole he dived in through but waiting for them were ten monsters, growling and dripping, their gross bodies limping over. Charlie grimaced and leaned Fionna against the wall.

"I'll protect you. I promise," Charlie said. He faced the monsters and they spit at him. He glared at them and adjusted his glasses. "Come and get her."

One ran over to him, trying to evade him and to reach Fionna. But Charlie swiftly sliced it in half. It fell into the sludge with a groan and sunk. The others were a little hesitant to approach but Charlie took his cue. He ran after them himself and punched two in the face, slicing them after they were dazed. He faced the others and grinned.

"Come on, then," he said, raising a hand and dared them to come closer. They seemed to agree that Charlie was dangerous and ran off in the other direction. Fionna smiled at him as he helped her up again.

"Good job, Charlie," she said, closing her eyes and leaning on him.

Charlie whistled and Adam flew inside. The great bird grabbed Fionna by her shoulder gently and flew upwards and out of the manhole while Charlie climbed the side ladder and outside. Adam had laid Fionna down on the street and the bespectacled boy lifted Fionna up, cradling her in his arms, and carrying her back to the tree.

"It's not safe to stay here," Charlie said. "We need to keep moving." He glanced down at the unconscious girl in his arms. He placed the Family Sword back in Fionna's bag. "Adam, can you grab our stuff and lead us to a safer place."

"Sure thing, Mister," Adam said, his talons grasping the bags and things and easily lifting them off the ground. "This way!" He flapped away from the manhole and towards the open and empty road, Charlie and Fionna not too far behind.

She opened her eyes to see the night sky, smoke billowing up in wisps, the smell of burning wood, and the sound of cracking fire. Fionna sat up slowly, rubbing her eyes and saw Charlie sitting on the other side of the fire, Adam flying around in the distance searching for a meal of rats or smaller birds that lived in the bare lands. Fionna still felt incredibly weak and worn down. Her arms felt like lead and her head was throbbing dangerously as she sat straight. With a small moan, she clutched the side of her head.

"How are you feeling?" Charlie asked her, handing her a canteen of fresh water.

"I never felt so bad in my life," she complained, taking the drink from him. "Like I'm about to die."

"Dying isn't fun. Don't die please," he said, cracking a smile.

Fionna giggled in spite of herself. "No, I promised my friends I wouldn't die."

"Let's both keep that promise, yes?" Charlie said. He was cooking a sausage in the flames. "Hungry? We stopped by a connivence store while you were still out and I found all these sausages in the freezer. A few meals for us. Enough to last a couple of weeks."

"Sure, I'll have a sausage," she said. He handed her a stick with the meat attached and she stuck it in the flames to allow it to cook. Her head still hurt and she felt dizzy but the water helped famously. She was just a little dehydrated and her stomach was grumbling at her. "How long was I out?"

"Two days"

"Oh, Glob! Really? I'm so sorry!" Fionna said, her eyes widening.

"Calm down. It's not you're fault," Charlie promised with a smile. "Whatever was stuck to you used your own strength against you. Drained you and made you weak. I've read about stuff like that. I'm surprised you could fight back for as long as you could."

"A voice... a voice returned my strength," Fionna said.

"But the only other people in the sewer was you and me. Ones that could speak any English, I mean," Charlie said. "Who was talking to you."

"It was hard to say but I have a hunch," she said.

"Who then?"

"Marshall Lee."

"How do you know it was him?" Charlie question sounded a little more demanding than he meant to but Fionna didn't catch his tone. She continued on instead.

"I dunno. It was just him." She drew her knees up to her chest tenderly, taking the sausage out of the flames and lifting it up slightly to cool. "It was like a connection or something. Like his memory gave me the will to fight back."

Charlie frowned a little. Fionna noticed this and she smiled at him.

"Jealous of Marshall, are we?" she teased.

Charlie's face turned pink. "What? No. I don't have any idea what you're talking about."

"Sure, Charlie. Whatever you say," Fionna laughed.

"Keep laughing like that and your body won't get any better," he warned with a knowing smirk as her hand went to her head in pain. "After dinner you could get some more sleep. It's the best thing you can get."

Adam flapped down in between the two so he had his own place at the fire. A dead rat was in his beak and he was eating it tenderly. Charlie seemed repulsed but Fionna said, "You dived into a disgusting sewer and you're grossed out by that?" He realized that she had a point and continued to cook his meal.

Fionna took Charlie's advice and relaxed inside her sleeping bag, snoring softly, the old stars watching over her. Adam's head was tucked beneath his wing as he slept. Charlie was still up, poking at the fire like Fionna usually did when she thought. He was humming softly to himself, trying to think about how Marshall Lee was the voice Fionna heard instead of his. Why Marshall? It's been months since Fionna left Aaa so why should she be focusing on this one guy? Yeah she can miss him but-

Whoa, what are you doing? Charlie thought angrily, kicking himself mentally. You have no right in getting angry with her or a guy you've never even met. But why did he feel this way?

His green eyes landed on his human companion, who was now mumbling in her sleep, occasionally sniffling away an itch on her nose and turning over. She was a restless sleeper, that's for sure. He smiled fondly at her and thought about how lucky he was to know her. Not only was she a human but she was a great friend. Someone who was loyal to the bitter end. Fionna was certainly an great traveling buddy. He could see why, from what she's told him, all her friends liked her so much. They must miss her more than anything. Even Marshall Lee misses her.

Charlie laid his back on his sleeping sheets, looking up at the stars and found each of the constellations in the sky. The Big Dipper, Orion, and so many more. He closed his eyes and let sleep take over, waiting for a new day.

The next morning, Charlie suggested they stay at camp until Fionna felt better. Fionna told him she was fine. She hated it when people, boys especially, thought of her as weak and helpless. It annoyed her to no end because she wasn't the damsel in distress. It was mostly the boys that worried that she had to save. Not vice versa. After a little bickering, Charlie caved and agreed with her. So they packed up their things and Adam started to lead the way down the path.

"If you get sleepy or anything, tell me," Charlie said to Fionna. "We'll stop and rest."

"I'll be fine," she said stubbornly. "Believe me. I've suffered worse than this. You shoulda seen this gash I got from a mountain troll. I nearly passed out due to blood loss. Gumball and Dr. Prince were able to fix me up but still." She laughed. "It was terrible. All cut open and gross. Cake was the one who passed out. And Marshall...? He just called me a moron for wrestling with the troll in the first place."

"Sounds like you got into a lot of trouble. How long ago was this?" Charlie said.

"Last year. A week after my sixteenth birthday," she responded. She grinned and laced her fingers together, putting them behind her head to support it.

"You wrestled a troll why?" Adam said from above.

"He was being a big caboose," Fionna said and Charlie laughed.

"So what?" Adam demanded.

"I don't tolerate cabooses," Fionna said casually making both boys laugh. "How long until we get to the crater?"

"Well, on the rate we're going, about another two months or so," Charlie said, looking at his map. "Maybe one if we make good time."

"There are still a lot of places we need to pass through," Adam said. "Cities upon cities... There's a really nice place we can go to in the middle of the route we're on."

"Really nice place?" Fionna repeated. "Is it really nice in the sense that you'd want to stay there or the really nice that it's suspiciously nice."

"A bit of both," Adam admitted.

"That's not really helpful," Fionna said, crossing her arms.

"It's worth a shot," Charlie said. "We're running out of supplies and I need to restock on a few band-aids. We're losing some."

"I have some in my pack," she told him.

"Yeah but we need more. Other stuff too," Charlie said. "Adam, have you been in the city?"

"Won't let animals in, so no. But I've seen people inside," Adam said.

Fionna and Charlie exchanged excited looks and then frowned. They both looked back up at Adam.

"Why didn't you tell us this sooner?!" Fionna barked at the bird, chucking a rock at him.

"Hey, don't yell at me, Miss Fionna!" Adam snapped, dodging the rock. "You just said you were looking for the crater. Never said anything about people."

"But how... never mind," Charlie said, realizing that he had a fair point.

"Then off to the city we go!" Adam said, turning right sharply and flying fast, Fionna and Charlie running after him.

So Fionna was rescued and Charlie is jelly of Marshall. Will Fionna and Charlie find more humans? Stay tuned so put this on your favorites, alerts, and review! I want to know what you think! (No flames though. They make me sad and want to delete the story). But I haven't gotten one so no need to worry!

Don't forget to submit any songs to me if you have one. :) And, as always:

See you next time!