Morty knows he shouldn't be screwing around with multidimensional shit. It's dangerous, it's impractical, it's blah blah blah. But it's a potential key to unlimited energy, how does nobody see that? He's built a dimensional siphon (it kind of looks like a cardboard box with a funnel and a TI-84 taped to it, but it damn well works), keyed in the dimensional coordinates to a random plane, and by God he's going to use it.
He flips the switch and waits for the energy bar to fill up.
It does! It fills up very rapidly. Then it explodes, along with the box. There's rather more smoke than there should be, and once the smoke clears someone is standing there.
"Oh dear," Morty says faintly.
She decides to express this sentiment out loud: "What the hell!"
Bella sighs. "Okay," she says. "Well. Lucky you summoned somebody who can teleport home without further ado. Where are we and what is your name?"
"We're at Whateley Academy. Um, it's in New England- Massachusetts- we're an hour outside Boston, in a town called Dunwich. You're a Warper? That's, uh, that's really lucky. I'm, I'm Morty, Morty Halliman. Codename, uh, Smokescreen. Because my stuff has a tendency to... that." He gestures weakly at the clouds of smoke.
"I'm Flicker." She looks at the smoke. "Cute. What do you mean, warper? Some kind of classification they have in this neck of the woods?"
"Uh... I don't think it's really, uh, this neck of the woods. Everybody uses the Corbin system. Like, I know Lord Paramount and Gizmatic go by their Exemplar and Devisor ratings, and, uh, well, I guess China might not, nobody really, uh, nobody knows how they handle mutants there. But the Corbin's pretty universal."
"...Okay, you know what you did with this machine. You were trying to get something from another dimension, right? What are the odds you got a somebody from another dimension instead?"
"Okay. I - hang on." She taps the back of her hand to her chin. "Alli. Alli please be there."
"Oh thank fuck. Alli, some - mad scientist from another dimension has summoned me and I can't - I tried to - it doesn't work. But twining works, I can still talk to you, okay, this isn't as bad as it could be. Yeah. Of course I will."
"I have a schizophrenic Warper from another dimension in my dorm room," Morty says dully. "I am going to be expelled and there's a schizophrenic Warper from another dimension in my dorm room. At least there'll be a spare they can put her in. No, wait, she'll have to go to Dickinson. Or Poe, actually, considering that she's schizophrenic. I'm so glad we worked that out."
"I'm not schizophrenic, you idiot. I'm talking to my twin. What part of 'another dimension' is not yet clear to the inventor of the interdimensional kidnapping machine?"
"She's not invisible, she's at home, in the dimension where twins have superpowers including talking to each other at arbitrary distances. Is there someone less intensely slow on the uptake I can talk to?"
He's much calmer now than he was when his life hadn't been ruined. There's not much farther down to go at this point, so dull sarcasm seems like the order of the day.
"Hello. Mrs. Hartford, how good to- okay. I accidentally summoned someone from another- yes. She can teleport, apparently. She talks to herself and claims she's talking to her twin in her home dimension. Yes. Because I am an idiot, ma'am. Good to know. Since I'm going to be expelled, I'd just like to say that you're an e- oh. I would like to retract that, ma'am. Yes."
He hangs up and drops the phone, his fingers no longer choosing to cooperate. "Mrs. Carson will fly in through the window in a moment. Could you open it, please? I would, but I don't seem to have working muscles anymore."
"Yes. My name's Bella, and apparently you still do codenames here; mine's Flicker. Your mad scientist here has taken me out of my usual gravity well and I can't teleport home."
"Yes. As a representative of Whateley Academy, I extend my sincerest apologies, and assure you that we will do our level best to send you home and to attend to your needs while you're here. This is not, um, unheard of, so we actually have a fairly substantial portion of our budget set aside for 'fish-out-of-water' cases. As I'm sure you'll be pleased to hear. Relatively speaking."
"I'm actually not pleased to hear that your students kidnap people from other dimensions on a regular basis. That is a problem."