Author's Note: This fanfic takes place during the Dream arc of the Sailor Moon manga and will also follow the plot of the SpongeBob video game Battle for Bikini Bottom. Spoilers follow for any who haven't finished the Dream arc or the game.

Chapter One: Subversionary

Usagi, transformed into Sailor Moon, stood alongside her fellow Guardians, Sailors Mercury, Mars, Jupiter, Venus, and her daughter from the future, Chibi-Moon. Tuxedo Mask, her boyfriend and future husband, stood beside Chibi-Moon, the team standing on top of the condominium in which Ami lived, at midnight. The palm of Tuxedo Mask's gloved hand faced Fisheye. The member of the Dead Moon Circus floated above the team. No civilians were around and, hopefully, no one watched the flashing lights or heard the booming attacks.

Fisheye was the first enemy from the recently arrived Dead Moon Circus that the Guardians had encountered, so Usagi watched Fisheye carefully, from Fisheye's wavy, shoulder-length blue hair, to his webbed hands, to his puffy blue jumpsuit.

Fisheye inched backward. Six Guardians and a man wearing a mask could overpower him. An attack on one Guardian—Sailor Mercury—meant that he'd attacked them all.

This was why Fisheye had backup.

A weapon that CereCere, his master, had given him. It would transport the Guardians anywhere.

Fisheye chanted the incantation CereCere had taught him, summoning the pole into his hand, the yellow ball appearing beside the pole. Before the Guardians could react, he hit the ball with the pole like he was playing pool. It flew to the Guardians and then exploded, creating a portal.

Fisheye thought about the ocean, his homeland, every day. He'd designed the weapon to send the Guardians to the bottom of the ocean. They'd die from pressure, from not being able to breathe. The Dead Moon Circus' problems would be solved.

The portal sucked in the air, inhaling the Guardians and the man with it, their screams lingering after they had been drawn inside.

Fisheye smirked. He would hear their cries in his sweet dreams.

That morning, Usagi had a tougher time than usual opening her eyes for school. She had an English exam, the reason she didn't want to get up.

The pressure she felt was unreal. Should've studied for that exam, then there'd be no pressure, either physically or mentally. And her room was freezing; it'd be even colder once she threw off her covers. Not much to look forward to.

Wait.

Something was wrong. She shouldn't feel this physical pressure, not from her bedcovers.

Usagi managed to part open her eyes. A burning sensation filled them, and she shut them again. During that brief period in which she had opened her eyes, she'd seen something she'd never forget.

A giant pineapple.

Usagi had dreamed about food before, so dreaming about a pineapple wasn't a stretch. But the dream seemed too vivid. While talking about Mamoru's dreams one day, Ami had mentioned something called lucid dreaming, where dreams felt like reality. Maybe Usagi was lucid dreaming.

"Sandy, do you know what these strange-looking fish are?"

"They look like the fish we saw during Squidward's Bubble Bowl."

"Holy cow, SpongeBob, these ain't fish. They're humans. We gotta get 'em to my treedome, fast."

Felt like a dog grabbed Usagi's wrist. Then she was being dragged through…sand? Was she at the beach?

Her dream had gone from a giant pineapple to talking things to a dog dragging her through sand. One of the stranger dreams she'd had.

She still couldn't open her eyes. It felt as though she'd been dunked into the Pacific Ocean, and the burning salt water kept her from opening them.

That's right. She and her friends had fought Fisheye, who'd created a portal that sucked the Guardians and Tuxedo Mask inside. Usagi had lost consciousness.

Maybe this wasn't a dream.

Fisheye's portal must've taken them someplace else. But to the bottom of the ocean, filled with salt water and immense pressure? Shouldn't Usagi have died? Unless her being a Guardian protected her from things that would kill ordinary humans.

She must be unconscious someplace else. Right, inside her room. Dreaming.

A metal door opened. Slammed shut. A siren rang, and the pressure and water drained away. Usagi was tossed onto a crunchy ground. She opened her eyes, could see. She lay on top of grass.

She pushed herself up, rubbing her eyes. Her friends lay around her, Chibi-Usa also rubbing her eyes. The sky was curved, like a dome.

Glass walls, like a dome, encased the open area. She could see outside like she would if she were in a dome, but only an ocean of blue was outside, like this dome was in the sky. Or underwater. Their being underwater was in the realm of possibility—the pressure, the cold, a villain named Fisheye sending them here, it all made sense.

What didn't make sense was the oak tree standing in the dome's center. Grass covered the ground. A hamster wheel stood to the right of the tree. Not like any dome Usagi had seen.

Maybe she was going to be used for an experiment. Made to run on the hamster wheel, live in this dome. Maybe the dome was underwater, and she'd have to survive in the dome with limited food and water and no video games, scientists observing her. She'd seen these things on T.V. Being a Guardian, she didn't rule anything out, no matter how much the rules of reality were defied. Even if she didn't want to believe that she was underwater.

A brown creature caught Usagi's eye. She looked to her right.

A person wasn't there.

A squirrel and a sponge and a starfish were. All of them standing on two legs.

The sponge wore square pants and a tie, like a human. If he wasn't squat, square, yellow, and big-eyed, he'd look like a professional in Japan, going to work.

The starfish wore only a pair of shorts. Bigger than the sponge, round. No nose, unlike the sponge.

The squirrel stood on two legs, the tallest of the three. Donned a white suit, a hibiscus flower decorating her helmet. She unzipped the suit, revealing a two-piece bathing suit. Took off the helmet, placing it on the ground, shook her head like she was shaking out a head of hair, but she didn't have any hair. She was covered with fur.

Usagi and Chibi-Usa shrieked, crab-walked away.

"Holy crap!" Makoto said.

"Am I dreaming?" Minako said.

Ami looked sharply at her. "The same dream?"

"It's…possible," Rei said, staring at the animals, not sounding sure.

Mamoru gaped.

"I thought I was dreaming," Usagi said. "But…" She looked at each of her friends, touched Chibi-Usa's shoulder. "You all are really here?"

Chibi-Usa nodded twice. "I'm really here." She whipped her head toward Mamoru. "Are you really here?"

Mamoru shrugged. "I don't know."

Usagi clung to Mamoru's arm. "You have to know, Mamo-chan. You're the one who usually has these weird dreams."

He narrowed his eyes. "That's supposed to make me an expert?"

"Uh, 'scuse us."

Usagi went silent, she and her friends staring at the three animals.

The squirrel had spoken. It sounded like a human female. Complete with some sort of accent.

"You talked." Ami's voice was barely above a whisper.

"You wouldn't happen to have any moon-shaped symbols anywhere on your body, would you?" Minako said.

The starfish's eyes gleamed. "I don't. But I do have this weird scar on my butt that I got from sitting on the T.V. antenna once." He—his voice screamed that he was male—turned around and began to pull down the only piece of clothing he was wearing: his shorts. "Wanna see?"

"No!" Usagi, Chibi-Usa, Minako, and Makoto yelled.

"Strangely, I'm curious," Ami said under her breath. Must've thought no one had heard, but Usagi had Ami's number. Although Usagi had shouted "No," curiosity nibbled in the naughtier corner of her head.

The squirrel raised her eyebrows—how did a squirrel have eyebrows? "Odd question to ask, if we had moon-shaped symbols on us. Why?"

Minako stood so that she stood taller than all three of the animals, placing her hands on her hips. "First, we'd like to know how we got here, because where we come from, there are weird things happening." She looked around, pursing her lips, struggling to take in the dome, the tree, the wheel. "It seems that weirder things are happening here, wherever 'here' is."

Luna, Artemis, and Diana, the three cat guides with human forms, had moon-shaped symbols on their foreheads, and they could talk. Maybe Minako thought that the sponge, squirrel, and starfish also had moon-shaped symbols, meaning that they were related to the Moon Kingdom. If they did, which the starfish denied, then Luna, Artemis, and Diana had weird-looking relatives.

The starfish seemed trustworthy. Genuine. Unless these animals were all associated with Fisheye. Usagi and her friends must keep watching these animals and their surroundings to make sure that they hadn't been put anywhere hostile.

"Welcome to Bikini Bottom." The sponge grinned, outstretching his arms. "The home of many fish. If you're wondering how you got here, you appeared out of an ominous swirling vortex."

"So Fisheye was behind all this," Rei whispered so that only the Guardians and Mamoru could hear her.

"Wait, fish?" Ami said. "Are we…underwater?"

"Yep," the squirrel said. "The Pacific Ocean, to be exact."

Makoto shot onto her feet. "Well, we can't stay here. We have to get back to Japan."

"Unless y'all can conjure up one of them vortexes again, y'all are stuck here."

"We can't be stuck here. There has to be a way back." Makoto looked to her friends. "Think, everyone."

Ami caressed her forehead like she had gotten a headache. "I'm starting to believe we're dreaming. Talking animals on two legs. Sponges and starfish don't even have legs."

The sponge's brow creased. "We don't?" He lifted one leg and then the other. "What are these, then?"

"They're legs, SpongeBob," the squirrel said. "These humans don't know what they're talking about."

SpongeBob. Obviously the sponge wearing square pants and a tie.

"Actually, we do," Mamoru said. "Where we come from, squirrels stand on four legs, and starfish and sponges don't have legs at all."

The sponge blinked. "Strange world you guys come from."

"I don't think you have the right to tell us, that," Makoto said.

"I don't think y'all have the right to tell us that," the squirrel said.

"Fair enough."

"We probably are dreaming," Minako said. "This dream might be telling us something." Her eyes pleaded with Rei for some answer, any answer about how to get back to Japan. "You're the supernatural psychic here. What's this dream telling us?"

"I have no idea." Rei averted her gaze to the ground. "Sorry I'm not helpful today."

The squirrel shook her head. "Y'all ain't dreaming. You really did come through a vortex, according to SpongeBob here."

"This can't be possible," Ami said. "We can't live in the same world with talking animals who walk on two legs."

"We live in the same world with monsters and demons and evil queens and past lives," Usagi said.

"Y-yeah…"

"Since it seems you'll be staying here a while," SpongeBob said, "let's introduce ourselves. I'm SpongeBob SquarePants."

Mamoru chuckled, glancing at the sponge's pants. "Fitting."

"I'm Patrick Star," the pink, round starfish said. "Nice to meet ya."

"My name's Sandy Cheeks," the squirrel said. "It's a pleasure to meet y'all, although I don't think it was a pleasure the way y'all came here."

Usagi remembered their fight with Fisheye, the pressure she'd felt upon waking up, the saltiness burning her eyes. "Definitely not." She smiled. "I'm Usagi Tsukino, by the way. Thanks for saving us from wherever we landed."

Ami looked outside the treedome, at the tall, metal buildings—not quite skyscrapers. "It looks like we really are in the ocean. I'm Ami Mizuno. My last name is means 'water of', so my name seems to fit this situation."

"I'd garner that you're land critters," Sandy said.

"Critters…" Minako said.

"I am too, obviously. I came from Texas, in the United States. Heard of it?"

Usagi and her friends glanced at one another.

"We're from Japan," Ami said. "We've studied the United States in school, but not the individual states themselves."

"That's too bad," Sandy said. "Although it's nice to be with some land critters for a change. No offense SpongeBob, Patrick. And if y'all are from Japan, then you're right near Bikini Bottom, where you are now. Bikini Bottom's in the Pacific Ocean."

"Who knew a place like this existed right in the Pacific Ocean? Talking animals right near us."

Mamoru cupped his chin. "Not to be morbid, but we should've died from the pressure of being at the bottom of the ocean. Why didn't we?"

Chibi-Usa looked around, mouth parted, like she wasn't paying attention to the conversation. "Maybe we weren't underwater long enough."

"That's true," Ami said. "It takes a little while for us to die from being underwater." She looked over herself and her friends. "Our bodies didn't start to break down, either, thankfully."

Chibi-Usa shuddered. "Break down? You mean, literally break like some crumbling building?"

"Thankfully not."

"I hope that our bodies won't break down at all." Rei didn't smile but watched the animals. "I'm Rei Hino. It's nice to meet you all, too." Her frown said otherwise. Maybe she thought the animals were part of the Dead Moon Circus. Usagi wouldn't be surprised—talking, walking animals would fit in perfectly in a circus. But if it took a while for humans to die underwater, and these animals were their enemies, then they would've left Usagi and her friends to die.

"And I'm Makoto Kino." Makoto clasped her hands behind her back. "You all are really nice for saving us."

"I'll say. I'm Minako Aino."

"I'm also Usagi Tsukino, but you can call me Chibi-Usa." She said more quietly, "You guys look like my stuffed animals at home."

"My name's Mamoru Chiba. To be frank, this whole situation's made me almost speechless."

"Understandable," Sandy said. "Sometimes, the fish down here leave me speechless too."

"What's that mean?" SpongeBob said.

"Nothing. Anyhow, I have a bunch of extra deep sea dive suits. Y'all can use them while you're here. I just hope they fit y'all. They'll keep you safe from the pressure out there, and you'll be able to breathe in `em."

"Sounds great," Minako said.

Now that Sandy mentioned wearing something else, Usagi looked at herself and her friends. They were still transformed into their alter egos, but to the animals, it looked like they were simply wearing sailor suits.

SpongeBob looked the Guardians up and down. "Looks like you guys came here on purpose, for a trip."

"No. We didn't," Makoto said. "Trust us."

So their identities weren't compromised, but that was probably because Bikini Bottom was a place where no one knew of the Guardians' existence.

As Sandy left to get the suits, Minako said, "We'd better stay here for the night. We're probably tired from the…whatever the hell happened to us, and we'll be able to think straight in the morning. I mean, I know we have to get back above ground as soon as we can, but it's impossible to right now."

"What can we do down here, though?" Rei said.

SpongeBob slid over to Rei. "Hang out with us."

Rei narrowed her eyes. "Please don't do that."

SpongeBob stepped back. "Why are you all in such a rush, anyhow?"

"Long story," Chibi-Usa sighed.

Sandy returned with the suits. "They should stretch to fit y'all. I had to make them that way so, when I gain a bunch of weight from hibernatin' every winter, I can fit them in case I have to leave the treedome for whatever reason."

Ami cocked her head. "You have winter down here?"

"Of course," SpongeBob said. "It snows and everything, and we have snowball fights."

"How do you have snow down here? The snow should melt once it hits the water."

"Uh, can you repeat the question, please?"

"It just does," Sandy said. "No rhyme or reason to it."

"Wow," Chibi-Usa said. "Just like us." Maybe these fish weren't as different as they first thought.

"I've designed my treedome so I can make it winter. I installed a few bells and whistles on it so it'll snow, get cold, the whole pecan pie."

Ami's eyes widened. "How did you do that?"

"A few basic inventions, like installing a giant thermostat and installing a snow-makin' panel up in the dome itself."

"I feel like this squirrel is smarter than me." Minako cleared her throat. "I'm sorry. I didn't mean for that to come out."

"No offense taken." Sandy said. "It's strange, though. Humans are big compared to all of us down here. Y'all should be big, too. Which you are—you're taller than us, but not as tall as you should be."

"We must've shrunk when we came down here," Ami said. Compliments of Fisheye.

"We'll stay here, with you all, for a while. Right, Patrick?" SpongeBob slumped at Patrick, who was sitting, snoring. SpongeBob snapped his fingers, and Patrick startled.

Usagi blinked. Talking sea creatures walking on two legs. A squirrel underwater for who-knew-why. Snow and winter in the ocean.

What kind of world had Usagi and her friends ended up in?

Today was the big day.

Plankton rubbed his hands together. His devious, genius mind had conjured up his best plan for stealing the Krabby Patty secret formula yet.

Of course, with him being a genius, it took him only a day to come up with the plan. But it had taken him several weeks to build the Duplicatotron 3000—with his computer W.I.F.E.—Wired Integrated Female Electroencephalograph—Karen's help.

The Duplicatotron 3000 would produce an army of robots that would rampage around Bikini Bottom, obedient to Plankton's commands. While everyone—namely Krabs, SpongeBob, and the octopus—were distracted, they'd steal the secret formula.

Plankton's eyes gleamed at his creation. The Duplicatotron 3000 stood on a platform above the ground, a towering square machine with a funnel jutting from its side, which the robots would pop out of. A switch for "Obey" and "Not Obey" lay at its opposite side, the switch for "Not Obey" there in case the robots weren't distracting the Krusty Krab employees enough to steal the formula and they needed to be more rambunctious and destructive. Some would say that putting a "Not Obey" option in the first place was stupid, but the "Not Obey" option was a genius move.

Plankton wiped tears of admiration at his own genius, at his creation, from his eyes. "It's almost as beautiful as you, Karen."

Karen watched from the other side of the room. A monitor suspended on the wall, Karen regarded Plankton with an unreadable facial expression, likely because she was a monitor, not a fish capable of showing facial expressions. All that was on her screen was a single green line that vibrated like a heart monitor in a hospital when she spoke.

"I'm flattered, Plankton," Karen said flatly. "Now, are you sure you have everything you need? Let's go through the checklist to be sure. Number one—"

Plankton waved his hand dismissively. "I'm a genius, Karen. I don't need a checklist. Except one that has the question, 'Is Plankton a genius?'"

"Frankly, no."

"Checklist comp—" He shot a glare at her. "Hey!"

"Seriously, you need to check—"

"I'm throwing in the switch now." Plankton jumped on one of Duplicatotron's levers, pushing it down to "On." Small robots popped out of the funnel hanging on top of the Duplicatotron, robots that Plankton called Fodder and would do most of the distracting. Short robots that were barely taller than Plankton himself. Each had a single green eye resembling a radar screen. Carried an electric wand-like weapon that shocked all who dared approach or, more accurately, accidentally step on them like many fish "accidentally" stepped on Plankton.

Plankton rubbed his hands together. "All right, my perfectly obedient robots." He jabbed his finger toward the door. "To the Krusty Krab."

The Fodders didn't roll toward the Krusty Krab.

They surrounded Plankton.

Their wands crackled with balls of electricity.

"Oh, no, no…" Plankton whipped his head in all directions, searching for help that wouldn't come. He couldn't have made a mistake. He was a genius.

His eyes bulged. He had set the Duplicatotron to "Not Obey." "Karen, why didn't you tell me that the Duplicatotron's settings weren't correct?"

"Because you're a genius, Plankton, and geniuses notice those things."

A Fodder lifted Plankton with its wand, and it carried him toward the Chum Bucket's door.

Plankton screamed in frustration. This couldn't be happening.

Another plan, unsuccessful.

The worst part was, they'd break all his good china.

SpongeBob, Patrick, Sandy, the Guardians, and Mamoru sat in the treedome, Usagi's head pounding, trying to think of a way out of the ocean. As powerful as the Guardians were, they couldn't create portals like Fisheye.

Sandy must've read her mind, because the squirrel said, "You could take the bus back to the surface."

Ami gawked and then quickly closed her mouth. "There are buses that can take us back to the surface?"

"'Course. There are also buses that take you down to Rock Bottom, too."

SpongeBob scratched the side of his face. "As I know all too well."

"But the next bus doesn't run until next month because there's so little demand for going to the surface. Lots of sea critters can't breathe in oxygen."

Minako groaned. The world above would be in peril until the Guardians returned to the surface. At least Haruka, Michiru, and Setsuna could protect Japan until Minako and the others returned.

"I also have my rocket that y'all could use." Sandy glared at SpongeBob and Patrick. "I'd love to take y'all back tonight, but two particular folks damaged my rocket extensively when they decided to go on a joyride with it. They even used my one jetpack and broke that too. Then they broke parts of my lab that I used to create the jetpack while wisely decidin' to play hide-n'-seek in there, so I can't create another one."

SpongeBob chuckled while Patrick clasped his hands behind his back, whistling to the tree.

Usagi leaned to Minako, who sat beside her, and whispered, "Could we use our own powers to fly back to Japan?"

"I don't think so. One, that would use too much energy, especially with us being at the bottom of the ocean. Two, the pressure down here would make flight much harder, even wearing Sandy's suits. If we tried to fly up while fighting the pressure, we might not make it all the way back to Japan. So, for the foreseeable future, we're stuck."

Usagi leaned back, straightening, lips pursed.

Sandy clapped her hands. "That's all water under the bridge, though."

"That's right," SpongeBob said quickly. "For now…" He reached into his pockets and pulled out a robot figure and a racehorse that looked just like the racehorses on the surface. "Let's play a game of 'Robots and Racehorses'."

Rei rolled her eyes. "I'd…rather do something else."

"But there's nothing else to do," Usagi said.

She smiled tightly. "Thank you, Usagi."

The group sat in a circle. SpongeBob passed out robots and racehorses to the group. Patrick looked between his robot and racehorse, biting his lip. He leaned to Chibi-Usa beside him. "How can you tell which one is which?"

Chibi-Usa stared at him. She had no words.

"Help?"

He was serious. Chibi-Usa gathered herself. "The robot's gray and the horse is brown."

"Oh, okay. They make these things look exactly the same."

Chibi-Usa kept smiling. "Yes. Yes, they do."

SpongeBob crossed his legs. "I sure wish we could play with real robots." He looked to the sky. "If I had one, I'd name him Robo Junior. Or Zorlon." He wiggled his fingers. "Or Frankie." He drew the name out.

Makoto snapped her fingers. "Like Frankenstein, except a robot."

"Robots are the wave of the future," Chibi-Usa said. "They're starting to create them in my centur— Ack. House. Home. Surface."

"You okay?" Sandy said.

Chibi-Usa coughed. "Yes, I just choked on air." That was the worst one she'd ever come up with.

"I choke on air all the time," Patrick said. "Real easy to do."

SpongeBob jumped up. "Wow, real robots above the sea. I'd love to go and play with them."

Patrick grinned. "You want real robots?"

SpongeBob nodded rapidly. Ami nodded, too.

"I can make them for you."

Chibi-Usa sunk. Not after his gaffe earlier. But a lot of people didn't seem too smart yet did amazing things.

Patrick pulled out a conch shell from his pocket. He deepened his voice. "This is my magic wishing shell. We put the toy robots in here." He put his toy robot inside the shell.

Makoto's mouth twitched. Don't laugh. "O-kay."

"We say the magic wishing words and then shake the magic wishing shell." He shook the shell up and down. SpongeBob shook up and down, too. Usagi bounced up and down and then caught herself and stopped, Mamoru casting her a look that asked if she was okay. Usagi nodded. "Then we go to sleep, and in the morning, we'll have real robots to play with."

Ami slouched. Disappointment fell over her. This shell wouldn't work, even if there were fish walking on two legs and defying everything Ami knew about the undersea world. Well, maybe rules were different here, and the shell would work.

"What happened to the magic wishing words?" Mamoru said.

Patrick pointed at Makoto. "She already said them."

" 'Okay' was the word?" Makoto said.

"Mm-hmm. It used to be 'Alakazamabananatikitanawishbanabitzvonviterschnauzer,' but I kept forgetting it."

"I wonder why," Rei said.

"Wise choice to change it, then," Minako said.

"How do you know it'll work, though?" Mamoru said.

"Because last week, I had only one big cookie crumb, and I was hungry, so I put the crumb in the shell, said the magic wishing word and, in the morning, I had lotsa little cookie crumbs."

Everyone was silent.

SpongeBob broke the silence, keeping it from turning into a more awkward moment than it already was. He stood, and a sudden wind blew from who-knew-where. "I proclaim that tomorrow will be the best. Day. Ever."

"If tomorrow's gonna be the best day ever," Sandy said, "we should get lots of rest."

A sudden tiredness crushed Usagi. "Oh, yes." She stretched, yawning. Hopefully, she would wake up back in Japan, not wherever she was now. Because she had quite an imagination, and this…situation had to be a result of her imagination, not real.

"Good night, everyone." SpongeBob sprung to his feet, Patrick following suit. He and Patrick, arm in arm, skipped to the treedome's vaulted door, both singing, "Gonna play with robots, gonna play with robots, gonna play with robots…"

SpongeBob and Patrick opened the door that led to the outside.

Robots were everywhere. Throwing Bikini Bottom's citizens on the ground and into walls, electrocuting them, smashing them with hammers—literally a "ham"-mer. Ham on a stick crushing people. One circular robot with many hands slapped one greenish-brown fish named Fred miles away. Where Fred landed, an explosion rocked the sea.

"My leg!" Fred cried.

Patrick jumped up and down. "Yay, SpongeBob, your wish came true."

Several fish shot glares at SpongeBob.

SpongeBob cringed. "Yay..."