Sorry it's short, and very fast moving. Yeah.

GUMBALL'S POV
"And that's what zanoids are!" I explained to Cake and Fionna's blank faces. Their eyes wandered from me to the wall behind me. "What are you looking at?" I asked. Fionna opened her mouth, but before she spoke, something wet stroked my face. I spun around in horror. Of course, it was Marshall Lee.
"Bubblegum flavor." Marshall hissed as a sharp grin crossed his face.
I turned and glared at Fionna. "Fionna, you brought Marshall Lee?" She shrugged with a squeamish grin.
"Hello Bubba, long time no see." Marshall Lee cackled, his face turning to wolf form. I hated that name. I wish I had never told him my name… But I never thought he would use it against me so much! But he was different before he met Ashley. Anyways…
Marshall's rabid foam dripped on my ballroom's hard candy floor. I lost my train of thought, what was I gonna ask Fionna? It was something… About…
"Wait, don't touch her!" I heard Cake cry out and I spun around to find Marshall prowling over my red-striped servant, Peppermint Maid. Fionna ran and kicked Marshall in the face, sending him back and away from Peppermint Maid. Marshall Lee jumped at Fionna and grabbed her hat, revealing the long, shimmering, blonde mop that I hadn't seen since she had a pixie cut. (She gave her hair to a Warlock) Fionna's face flushed and she dove for her hat, but Marshall Lee glided to the ceiling where Fionna couldn't reach.
"Give it back!" Fionna threw her sword up, but it missed by a long shot and fell to the floor with a clank. By the time she retrieved her sword, Marshall had fastened the hat around his thick, black hair.
"Give it back!" Marshall flailed in a mocking-manner, speaking in falsetto.
"C'mon, dude. Don't be such a hat-napper." Fionna slumped and turned to Cake for aid, but Cake had wondered off to somewhere unknown.
"C'mon, dude. Don't be such a hat-napper." Marshall mimicked again.
"Two can play at this…" Fionna mumbled, running her fingers through her hair to make it stick up. She took her sword and held it like a guitar. "I'm Marshall Lee, the vampire king. I use my weapon as a musical instrument and get my kicks by bringing nightmares to babies!" Fionna made her voice low and spaced out the words, strumming her sword like a banjo. Marshall Lee narrowed his eyes and lowered himself about halfway.
"Ha ha! This is quite humorous." I clapped my hands. Then I realized that sounded kind of dorky and stepped away a little. Marshall Lee stared at me, grinning.
"Wasn't that funny... How long has it been since you've had fun, Bubba?" He came closer to me.
"I have fun all the time! Today I dissected some radio-active dimple plants!" I gushed, remembering the fabulous discoveries I had made that morning. I turned to Peppermint Maid, who was still cowering and quivering in the corner. "Remind me to send my theories to Professor Compute later." Marshall Lee recoiled in disgust.
"You call THAT fun? Ha, you don't even know."
"Oh please, like you know what fun is." I crossed my arms. Marshall floated towards me, even closer this time. Our noses were almost touching.
"I could show you if you would just let me." He flashed his teeth at me, obviously aware how uncomfortable I was. "Have you ever been to the Waste Lands? There's all kinds of cool junk to mess with!" Suddenly, glass rained everywhere like a knife storm. Something was hovering in the air, something blue. And old. Ice Queen. She clutched Cake in a small carrier thing. It was gray, will some kind of ticket stamp on the side and another sticker that read "this side up." I hadn't seen anything like it before.
Her hair fluttered and she swooped down towards Fionna, grabbing her by the waist and flying back towards the broken window. Marshall Lee flew up to retrieve the young hero, but the Ice Queen shoved her cool blue hand in her white hair and pulled out a wooden cross along with a handful of dandruff. Although the cross shouldn't have affected Marshall when the Ice Queen chucked it, it smacked him in the face and sent him in a dizzying crash a the Ice Queen made her get away. I rushed to Marshall's side and shook him to consciousness.
MARSHALL LEE'S POV Everything was pink and fuzzy as I tried to open my eyes. My face stung as everything became clear once again. Bubba was standing over me, a look of anxiety on his pink face. I sat up quickly, looking around at the broken ballroom. Why had the Ice Queen taken Fionna instead of Gumball? Weirdo.
"Well I guess I'll go after her." I shrugged, probably wouldn't take long if I flew.
"I'm coming, too!" Bubba declared and puffed out his chest "heroically."
"No! You'll just slow me down." I waved him off.
"It's my fault he's gone. Just let me go! You can show me how to have 'fun'" Bubba made air quotes.
"Fine if you want to go so bad… It's gonna take longer to get there since we have to walk…"
"Why?"
"You're to heavy to carry, man."
"Offensive!" Bubba whined. Then looked at me "We could take Lord Monochromocorn!"