Laina stands in the middle of the stage, arms crossed as YOSO zips by her again and again. Eventually, she holds out a hand and successfully grabs the girl's scarf. Unfortunately, the momentum of YOSO's quick passing makes the scarf tug at her neck and stop short with a gagging sound.

"Sorry," Laina murmurs upon hearing the sound. "I was trying to stop you."

"Mission accomplished," YOSO wheezes, pulling at the scarf to set it right as she faces Laina.

"Why are you running around like that?"

"I've got an episode to prepare for"—YOSO checks her watch—"and I'm running out of time to do so. Gotta go." She turns to go.

Laina holds onto YOSO's sleeve before she can leave. "Hang on. What's the episode about? Maybe the rest of us can help."

"Uhh..." YOSO seems to have some difficulty answering. "I... uh... it's, um, it's a secret."

"A secret?" Laina repeats flatly.

YOSO cracks a nervous smile. "Yyyes?"

"Why can't you tell me?"

"Because."

"Because why?"

"Because reasons, and oh, look at the time"—YOSO points at her watch for emphasis—"I've got so many things to do and so little time to finish them. Bye!" She pulls her sleeve out of Laina's grasp and runs before she can be questioned further.

Ian and Millie stand across from each other, metre sticks drawn like swords in their hands. They mimic each other's slow-circling pace. Millie swings first, springing forward and making Ian hold the stick in front of his face to block. The metre sticks strike each other again close to the twins knees. Ian smacks his sister's hand, making her drop her weapon. She puts her hands up as the oversized ruler skids behind Ian.

He smirks in victory and puts the metre stick to Millie's shoulder. She nods and kneels on one knee, sneaking a glance at the ruler behind Ian. The boy starts to pull the metre stick back. He doesn't get to finish his silent gloating, as Millie sweeps his feet out from under him with one leg, making him fall on his back. She grabs the metre stick out of the air and points it at her brother's face as he props himself on his elbows.

Ian slowly reaches back as Millie nudges his shoulder. "Surrender," she says.

"Nn-no." He grabs the fallen blade and hits hers away. He stands and snatches Millie's ruler out of her hands, crosses both of them, and sets each of the ends to her shoulders.

"Dangit," she whines as Ian mimes pulling the blades like scissors across her neck.

"Rematch?" he offers.

"Obviously."

They resume their places across from each other. Ian tosses a ruler to Millie and they both swing at each other. The metre sticks snap on contact. The twins stare at the remnants of their weapons, shake hands with the muttering of "A temporary truce", and pick up the half-sticks from the ground. Millie fits the pieces of hers back together as Ian does the same.

"We need glue," he murmurs.

"No duh," she replies. "You remember where the good industrial-strength stuff is?"

"Yeah, let's go."

Ian narrows his eyes as he carefully puts the glue-coated ends of the metre-stick back together. Millie sits next to him, mirroring his cross-legged pose as she holds together her own ruler. He holds the stick up with his left fist and holds up the right one in celebration.

"High-five!" he cheers. Millie accepts and the two slap their right hands together. Sadly, when they tried to pull them away, they stuck.

"Uh-oh," Millie says. She tries to use her left hand, but finds it stuck to the metre stick. "Dang," she mutters as Ian discovers the same.

"We're stuck," he says flatly.

"Yup."

He sighs. "Let's see if we can call for help."

"Dude, how?"

He presses his lips into a thin line. "That's what we're gonna have to figure out."

Stumped, they sit in silence.

"We can use the walkie-talkies," Millie suggests.

"YOSO said those are for emergencies," Ian says unsurely.

"I think this may just count."

"Alright, alright. It's in my sweater pocket." He attempts to use the hand stuck to the metre stick to reach into the aforementioned pocket. Then, he puts the stick into his pocket and tries to nudge the walkie-talkie out. "It's not working," he says finally.

"Here, let me try." Millie reaches around herself to use the ruler glued to her own hand.

"I think you just hit my spleen," he wheezes.

"Sorry!" She immediately recoils, bringing the walkie-talkie out with the metre stick. "Hey, it worked."

"Now to deal with a new problem: the speak button."

"Okay, uh, I'll hold this closer to you, and you can use your foot. Then we'll just scream into the walkie-talkie at full blast. She's bound to hear us then."

And so...

YOSO sits in her room, watching her laptop screen with earbuds in. Suddenly, Ian and Millie's shouting fills the air, shocking her into falling out of her chair and hitting the floor. "Ow," she groans weakly.

"I'm telling you, it's easier than it looks to get stuck like that," Millie explains.

"How?" Dani asks, disbelieving. "It's just glue."

"No no no. Elmer's is 'just glue'. This—this is some next-level glue we're talking about."

"If you're so afraid of it, I'll just hold for you."

"You'd get stuck in thirty seconds, tops."

"As if," Dani scoffs.

"Alright, here." Millie hands over the bottle of glue, forcefully shoving it into Dani's hand.

Then, they wait.

Dani starts to read the label. "It's been thirty seconds—"

Millie huffs. "Fine. Give it back." She holds out her hand.

Dani tries to put drop the bottle into the outstretched hand, but it firmly stays where it is. "What—?" She attempts to pry the glue off of her palm, grunting softly.

"Stuck?" Millie smirks.

"Hang on," Dani grunts. Finally, she pulls the bottle free. "How'd that even happen?"

Millie's smirk falters. "I may have cheated a little." She points to the glue. "See, I put a drop of the stuff on the bottle when I gave it to you. You didn't notice 'cause it's invisible."

"Just a drop?"

"Yeah."

"Hmm..." Dani rubs her chin in thought. "This stuff could be useful. Say, you wouldn't happen to have an empty bottle of Purell hand-sanitizer, would you?"

"Start from the beginning," AJ says, hand on his chin. "How did this happen?" He gestures to Beck, whose fingers are laced together on the top of his head.

Beck glares at him, jaw setting in exasperation. Slowly, he exhales through his nose. "I saw one of Ford's beakers on the floor, I picked it up 'cause I wanted to return it to him, Dani told me McGucket had done something gross to it, then she offered me sanitizer."

"And you trusted her?" asks AJ, incredulous.

"Yes." Beck sighs tiredly. He lifts his hands off his head, and the hat that is stuck to them goes with.

"For shame."

"I get it; it's bad." Beck holds out his glue-covered hands and the hat that is stuck to them. "Just help me get this stuff off," he pleads.

"Alright. Hear me out on this," AJ says. "What if... we just burn the hat off?"

"Are you insane?!" Beck exclaims.

"No. Maybe. Look, if you burn the hat, then it won't be stuck to your hands anymore. Simple."

"Yeah, because there won't be any hands left for it to be stuck to."

"Exactly!"

"No. Just, no. I'll go see Ford, he probably has some super-glue-remover or something."

Ian joins the conversation now, smiling cheekily. "'Fraid to tell you this, buddy, but, uh, the last of it was used on me and my sis."

"Seriously?!" Beck stomps his foot with frustration. "Now what am I supposed to do?"

"Ford's making more—"

Beck becomes hopeful.

"—but the stuff needs to age for about a week before it's usable."

So much for hope. "I can't go a week without my hands!"

"Sure you could," AJ counters. "You could use your feet for everything."

"Or your elbows," Ian adds.

"Have fun trying to twist a doorknob open."

"Nice to see I have such wonderful friends to help me with my problems," Beck says flatly.

AJ grins. "No worries; we're here for you, bro."

Beck rolls his eyes. "I'll go figure something out on my own."

Beck, visibly content with the lack of hat stuck to his hands, rejoins AJ and Gabs a few hours later. He now wears a black hat with a blue-outlined "H" stitched into the front to replace the one covered in glue. Also, he's changed his clothes to match the new head-wear—he sports a shirt with thin blue-and-black lines and dark grey shorts.

"How'd you get the glue off?" AJ asks him.

"Crowbar, nail polish remover, and a whole lotta spit," Beck declares.

Gabs raises an eyebrow. He takes a few steps away from Beck.

"Hmm," AJ hums in thought, looking over Beck's outfit with his hands in his pockets.

"'Hmm', what?" Beck wonders.

AJ nudges Gabs with his elbow. "Doesn't he look kind of, I don't know, similar to someone we know?"

Gabs joins the scrutiny, suppressing a smile. "Yeah, actually, he does."

"What?" Beck asks, growing impatient. "Tell me, who do I look like?"

It is at this moment that YOSO rushes by, muttering her apologies as she goes.

"And there she is now," AJ says.

When she runs back the way she came, he sidesteps and holds out a hand to stop her.

"What do you want, make it quick, I gotta go," she mumbles, checking her watch.

Instead of giving a verbal answer, he turns her around to face Beck. Both dressed similarly in blue and black, Beck and YOSO give each other a once-over.

YOSO speaks first. "You makin' fun of me?"

Beck: "No."

"Was this intentional?"

"No."

"Are we going to acknowledge this ever happened?"

"Please no."

"Good. Now go change."

Beck reels. "Hold up. Why do I have to change?"

"Because those are my colours." YOSO crosses her arms. "I had 'em first."

"Well, maybe you've had them long enough."

"Since when are signature colours things you can have for 'long enough'?" YOSO steps forward and shoves him, making him step back a bit. "These are my colours; go back to yours."

"They're mine now." Beck shoves her back. "Maybe you should go get some new ones."

"Fight, fight, fight," Gabs chants quietly.

YOSO huffs and rolls her eyes. "We're not fighting."

"In order for that to happen, it would have to be fair," Beck points out with a challenging look.

"You're right. Hey, if I tied my hands behind my back, you might actually have a shot at winning."

"Girls, girls, you're both pretty," AJ says, putting an arm around both Beck and YOSO's shoulders. "No need to kill each other just because you showed up wearing the same dress."

"Butt out, AJ," YOSO snaps, ducking out of his grasp.

"Yeah," Gabs says nonchalantly. "They need to work out their relationship problems on their own."

"Say what?"

"We're just friends," Beck argues, stepping away from AJ. "And even that's a bit of stretch."

"Aw, they're in denial," AJ coos.

"We're not in denial," YOSO says.

"It's just that the idea of the both of us in that kind of relationship is absurd," Beck shudders.

YOSO stares at him a moment. "Please excuse me, but..." She turns her head, puts a finger in her mouth, and makes retching sounds.

"How charming," Beck says sarcastically. He seems to rethink his comment upon seeing AJ and Gabs grin. "It was sarcasm!"

AJ: "Sarcasm?"

Gabs: "Or hidden attraction?"

"That's probably why he started dressing like her."

"So they'll match."

"How sweet."

By now, YOSO has straightened herself out and has taken to glaring at the teasing duo.

She narrows her eyes a little.

Later...

"Does it sting?" Mabel asks, lifting a hand to poke AJ.

"Yes," he answers, pushing her hand away.

"Want some more ice?" Ian asks.

"I'm good, thanks." AJ brushing his fingers over the bruise under his eye. "Man, I can't believe your girlfriend busted up my face. It's a work of art, you know."

"Keep calling her that and you'll be nursing bruises under both eyes," Beck growls.

YOSO walks across the stage, fidgeting with a device in her hand. She turns it over a few times, eyes narrowed in focus.

That makes it all the more startling when Beck approaches her. "YOSO, we need to get this sorted out."

The device flips forward as she stops abruptly. She grabs it and hides the thing behind her back before Beck can see. A small zap fires off to the left, and she stares at the stray beam in concern before inhaling through her teeth and looking at Beck.

He spares her nervous smile a suspicious glance then continues speaking. "If we keep wearing the same colours, AJ and Gabs are going to keep doing... whatever it is they're doing. How about we just flip for it?" He takes a coin out of his pocket. "Heads or tails?"

"Yeah, sure, whatever. Um, I just gotta gooo..." She tries to go around him, but he steps to block her.

"You didn't say heads or tails."

YOSO stares at him, bewildered. "If you think I'll give up my colours just because of a coin toss—"

"Rock-paper-scissors, then."

"No." YOSO edges around him and walks past. "Look, I've got other stuff to do, so if you'll excuse me—"

"What's that in your hand?" Beck points at the device behind her back, making YOSO turn around to hide it.

"What, this hand?" YOSO presents her empty right hand. "Nothing."

"No, the other one."

YOSO puts the device in her back pocket and holds up both hands. "See? Nothing in either of 'em."

Beck gives her a flat stare. He circles around her. YOSO turns so that she is always facing him. "Can I see?" he asks after making a full turn.

"No."

"Please?"

"No. It's mine."

"You won't share?"

"No." Before Beck can object anymore, YOSO babbles her excuses—"Very-busy-got-stuff-to-do-gotta-go-now-bye!"—and quickly shuffles backwards off the stage with her hands behind her back.

It is now nighttime in the studio and everyone is asleep.

Well, almost everyone.

Ian, Millie, and YOSO sneak out of their rooms—the latter carrying her device and all three holding some form of juvenile weaponry. Ian holds the slingshot in his hand, while the pencil for his clipboard and paper sticks out of his pocket. Millie holds the metre sticks she and her brother had used before; they make a light tapping sound as she walks. YOSO keeps a long stick tucked under her arm—a task that proves to be difficult while she tampers with the device with a screwdriver.

The trio make their way to the stage, gently lowering their supplies to the floor to ensure minimal noise.

"Done," YOSO whispers, holding out her creation. She tucks the screwdriver in her pocket so she can hold the small machine with both hands.

"How does it work?" Ian asks, voice soft.

"It's like a radio; twist the knob for the frequency you want. Except instead of a station, we get AUs. At least, I hope we get AUs."

"That's what we're here to find out, isn't it?" Millie murmurs.

"Right," YOSO agrees. "Everything ready?"

"Yeah," the twins reply.

"Ian, you'll write things down, yeah?"

He nods. He picks up the clipboard and holds the pencil to it while his sister touches the ends of the oversized rulers to the floor.

YOSO takes a deep breath. "Frequency 1." She twists the knob and presses a couple buttons.

A portal opens several feet in front of her, floating a few inches off the ground. The edge of its circular form emits a slight buzzing sound, along with a faint light separate from the light from the forest scene inside the portal.

"Looks like it worked," Millie points out, just as tense as the others.

"We still need to see where it goes," Ian reminds her.

"Hang on," YOSO tells them, setting the portal machine. "I'll check." Tentatively, she step through to the other side and looks around. "It looks like Reverse Falls."

Ian is quick to jot that down.

YOSO steps back through the portal, just as Gideon's voice shouts, "Hey!"

"Uh-oh," Ian winces.

"Wait! Stop!"

YOSO picks up the gadget and closes the portal just as a pine-tree-stamped hat appears on the other side. "That was close," she breathes.

"Too close," Millie says with a nod. "We have to be faster than that or one of the characters will find us again."

Ian and YOSO have no qualms about that. The three of them repeat the process for the next few hours, sometimes switching jobs when they get bored. At some point, they set the slingshot and sticks to the side because they had come to the conclusion that nothing dangerous would come out of the opening.

"Frequency #24," Ian announces quietly.

The entryway opens onto a dark landscape. Shapes are barely visible and hard to make out. Suddenly, a grotesque arm shoots out, retreating only after grabbing YOSO and pulling her back with it. The portal closes just moments after that, leaving Ian and Millie to stare at each other in wide-eyed shock. Frantic, they punch some buttons on the device, opening a portal that spits YOSO out onto the floor. Covered in slime, she wraps her arms around herself and shudders.

"So..." Ian pipes up. "Which dimension was that?"

"N-N-Nightosphere," YOSO stammers.

"Nightosphere? Like in Adventure Time?"

"Y-yeah."

Ian holds the gadget up to inspect it with one eye. "I thought this thing only got Gravity Falls channels."

"Apparently not," Millie says with a shrug.

"It's an experimental gizmo that I made myself," YOSO grumbles. "Do you really think that I could narrow it down to just Gravity Falls alternate universes and dimensions without experimenting with the range first?"

"Well, we're experimenting now." Millie puts her hands on her hips and puffs out her chest. "That being said, we now know that this thing is unpredictable and we need to be ready for anything else that comes out of it."

They fall into silence. Ian and Millie shuffle a from side to side, staring at YOSO quizzically. Eventually, Ian takes a pack of Kleenex out of his pocket and offers it to her, only to be met with a flat—albeit tired—glare.

YOSO sits up and wipes some of the goo off her cheek, then wrinkles her nose at it in disgust. "I'll go get cleaned up." She stands, slipping a little on the slime pooling beneath her feet. "You guys should keep going."

When she comes back, Millie yawns as she closes the latest portal, while Ian scribbles about its result.

"It's really late," YOSO yawns, presenting her watch. "2am. You guys want to sleep?"

The twins bob their heads from side to side in consideration. "Nah."

"We need to get through as many of these as we can," Ian states, pointing at the device. "We can't make the episode without having access to those AUs."

"I know, I know," YOSO says, as if she's heard it before. "But we've still got to figure out what to do about all the other problems."

Millie sighs. "Yeah. We can't just get rid of them."

"Why not? They practically drove us out before," Ian counters.

"We'll think about this later, guys," YOSO interjects. "For now, we need to label all these channels."

Come morning, Ian, Millie, and YOSO are asleep. The others find Ian and Millie leaning against each other in the middle of the stage—one holding a pencil, the other a clipboard. YOSO sits against the wall with the portal device hidden in her hands.

A magnet, at the end of a fishing rod, slowly approaches the device. It stops above YOSO's hands, then starts to lower itself.

"What are you doing?" Eris asks.

Beck freezes, giving her a sidelong glance as the magnet hangs above his quarry. "Nothing."

Eris crosses her arms. "You're after her invention."

"Oh come on. You're not the least bit curious about what it does?"

"I am, but if she doesn't want to tell us, that's none of our business. Besides"—she lowers her voice to a whisper when YOSO stirs—"you'll wake her."

"If you stop talking, she won't," he counters quietly. He resumes his mission, successfully getting the magnet to touch the device with a clink. He cheers and reels in the magnet, but the device stays where it is. Confused, Beck tries again. The magnet still won't pick up the gadget. "Are you kidding me? It's not magnetic! Why is it not magnetic?!"

His frustrated whisper-shouting is enough to make YOSO wake up. She notices the magnet in front of her nose, then follows the string to which it is attached to the rod and the boy holding it. "Dude, what are you doing?" she grumbles.

"Trying to steal the gadget," Eris chirps.

"Snitch," Beck hisses.

YOSO stands with a yawn. She pushes the fishing rod away and shakes the twins awake.

"How long were we out?" Ian asks groggily, rubbing his eye.

YOSO checks her watch. "Five hours."

"Wake me after five more," Millie murmurs sleepily, then lies down again.

She and her brother are quickly pulled to a standing position by YOSO. "Go sleep in your own room," she says, nudging them towards the appropriate hallway.

"But the floor was comfy," Ian whines.

"Go."

They obey begrudgingly. YOSO tucks the portal device into her hat, making Beck mope. She notices his calculating look above her head. "Don't even think about it," she warns, pointing at him for emphasis.

"You should sleep, too," Eris prompts, worriedly glancing at YOSO's drooping form.

"I'm fine. I'll sleep once I've finished everything."

"Here, we'll help."

"No!" YOSO coughs meekly at the stunned reactions to her outburst. "I mean, don't worry about me; I'll handle everything."

"You're in no shape to do anything on your own," Eris argues, hands on her hips. "Why can't any of us help you?"

"Because."

"Because why?" Beck asks.

YOSO glares at him. "Because it's a secret. One that I don't want to tell you." She starts walking backwards off the stage. "Now if you'll excuse me..." YOSO turns and runs before Eris can protest further.

The hallway camera finds Stan slumped against the door frame of his room, exhausted and in his undershirt and boxers. He seems to squint, but the glare on his glasses makes his eyes difficult to see. "This bag of bones gets worse every time I see it," he grumbles. "Stan, you need vitamins or somethin' because this thing is in horrible shape, I swear..."

He pushes himself up and tries to straighten, but ends up slouching instead. "How are you still alive, old man?" he chides himself. "Ugh, I need to get a new body and fast."

Stan trudges to the end of the hall and turns the corner, muttering, "Next person I see, I take their skin. 'Beggars can't be choosers' and whatnot."

The camera view switches just as YOSO skids to a stop in front of him. "Sorry, Stan, almost ran you over," she explains quickly. "Gotta go now, bye!" She sidesteps and keeps going.

"Hang on a sec," Stan says gruffly, making YOSO look over her shoulder at him. He clears his throat, and, with a much nicer tone, he says, "I need some new clothes."

YOSO walks back, head tilted to the side in confusion. "What's wrong with the ones you have now?"

"They're really old."

"Okay, but you gotta remember that all I've got is that freaky clown costume Ian found." She scratches the back of her head. "Although, there may be some costumes in some of those unopened boxes. There could be something usable in there. How's that?"

"Great. I get clothes and, in return, you get nothing."

"It sounds really mean when you put it like that—"

He holds out his hand, silencing her. "So, we have a deal?"

"Uh, yeah, I guess." YOSO narrows her eyes in suspicion. She slowly takes his hand and shakes it. "Deal."

Stan grins wide, yellow eyes widening in glee.

"Uh-oh."

YOSO picks herself up from where she fell on the floor, hair falling over her face as she does so. She notices Stan's prone form close by, circles him in contemplation, then nudges his arm with the toe of her foot until he wakes up.

"Eh?" Stan grumbles. He pushes himself onto his elbows and squints in confusion. "Where am I?"

"In the hall outside of your room," YOSO says curtly. "You were sleepwalking and ended up here."

Stan stands and makes his way back to his room, complaining about how he barely had enough energy to walk when he was awake, how could he walk in his sleep?

"That's that," YOSO murmurs after he leaves. She winces and turns her head to look at the air in front of her. "Now what am I supposed to do about you?"

She stays silent a moment, as if listening to something, then chuckles and shakes her head dismissively. The camera view switches to the stage camera as YOSO passes by it.

YOSO and the ghost version of herself that floats behind her.

Captions appear at the bottom of the screen as the ghost speaks. Just how are you planning on hiding your eyes, wise guy?

"I told you, I've got this figured out." YOSO brushes the hair of out of her yellow eyes. "Why do you keep this stuff so long?"

I like it long.

"I'm cutting it the first chance I get."

No!

"I'm ignoring you now."

Bill! You can't cut my hair!

"Watch me. And for the record, it's my hair now. Same way this is my skin now. You know what that makes you?"

Um... a girl temporarily without a body?

"Nope. A pain in the neck to be dealt with at a later time."

The ghost that is YOSO flies in front of Bill to look him in the eye. Answer me this: How. Are. You. Going. To. Hide. Your. Eyes?

"Sunglasses, how else?"

And you don't think that my sudden interest in sunglasses is going to make anyone suspicious?

"Watch and be amazed, Snapshot. I know how to trick all these bozos."

Ten minutes later...

Bill sits on the stage, elbows resting on his knees and sunglasses over his eyes. He gives YOSO a smug smile, tugs at the purple scarf around his neck, and straightens out the trench coat around his waist.

Gabs gives him a sidelong glance as she walks past, stopping for a moment to ask, "Hey, YOSO, what's with the new getup?"

Bill grins and adjusts the sunglasses. "Just trying something new."

"Does this have anything to do with what happened with Beck?"

"Don't know what you mean, but sure."

Gabs accepts the answer with a nod and keeps walking.

YOSO shakes her head in disapproval. Unbelievable. You know what? You may have fooled Gabby, but someone else will notice something's wrong.

"You really think so?"

Yes. I have faith in human intelligence.

"Alright." He leans back on his hands and crosses his legs at the ankles. "I'll wait."

And so he waits.

Dipper and Mabel pass by with no more than a curious glance. Bill waves at them perkily as YOSO crosses her arms defiantly.

Eris, Leela, and Laina stop to talk with Bill. If they wonder why "YOSO" was wearing sunglasses indoors, they don't ask. After they leave, Bill puts his hands in his pockets, then smiles as he takes out a lollipop.

He unwraps it as Nick rushes past while scribbling something on a slip of paper. YOSO stares at both people incredulously.

When Millie offers Bill hot cocoa, YOSO throws her arms up in defeat. When Ian asks him about the next episode, she kicks the floor, thus flipping herself over because the force of the kick wasn't stopped by the floor as she had anticipated.

That's it, YOSO declares.

"Giving up already?" Bill asks her, lowering the mug of hot chocolate from his mouth.

I've lost all faith in humanity, she mopes, sitting on the stage. She falls through the floor, flying back up moments later with an annoyed look.

"Aw, don't feel so bad." He returns his attention to the drink.

YOSO stares expectantly. And...?

"And what? That's it. 'Don't feel so bad.' It's annoying."

How uplifting, YOSO murmurs dryly.