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The Mystery Twins Meet the Mess-Up Twins

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"Marco Diaz and Star Butterfly to the principal's office." The voice over the intercom announced. "Marco Diaz and Star Butterfly to the principal's office."

As the pair of friends left their class, Marco whispered, "What did you do?!"

"Nothing!" The princess answered, before pausing to think. "Recently."

The boy released a long-suffering sigh, while the blonde skipped beside him. Quickly reaching their destination, Marco knocked on the principal's door. The man from beyond told them to enter.

"Ah. Marco and Star." Principal Skeeves began. "I'd like you to meet our two newest students."

He gestured to the other teens in the room.

"These are Dipper and Mabel Pines. They've just transferred to our district."

When he finished, the two kids waved. Star and Marco looked at the new arrivals, immediately noticing their similarities. They were obviously siblings, and probably twins.

"I want you two to show them around." Skeeves continued. "Since you're an experienced school guide," He looked at Marco, "And you're our newest exchange student." He nodded to Star.

"Uh, sure." Marco answered.

"Great!" The principal pushed them out of his office without another word.

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The new girl jumped forward, sticking out her hand. "Hi, I'm Mabel! I'm 14 and own a pig! Wanna be BFFs?"

"Okay!" Star vigorously shook her hand, followed more hesitantly by Marco.

"This is my twin bro Dipper." She said. "He's kinda a dork, but not too bad once ya get to know him."

Dipper rolled his eyes. "Thanks Mabel. Thanks for that." And shook their hands as well.

"I like your hearts." Disregarding any concept of personal space, the brunette girl stepped forward and booped Star's cheek. "What kinda makeup do you use?"

"Oh, they're natural." Star explained. "You see: I'm a magical princess, from another dimension!"

Marco was impressed when only the rainbow caught fire after Star summoned it, leaving the school unharmed. But now came the difficult task of explaining his friend's presence.

"Hmm, neat." The twins responded to the display of magic.

Well, that was… unexpected.

"What dimension are you from?" Dipper asked, finally engaged in the conversation.

Definitely not the usual response.

"I'm from Mewni."

The boy closed his eyes, searching his memory. Finally he said, "I'm not familiar with that one, but welcome to Dimension 46'\."

Star gave him a blank look, mirrored by Marco.

Dipper chuckled anxiously, rubbing the back of his neck. "Sorry. I guess the trouble with infinite universes is that Standardized Designations don't really mean anything."

"Oookay…" Marco ushered the new students towards a classroom. "Let's start here. We're all in Miss Skullnick's homeroom."

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After the bell rang, the quartet exited the class with everyone else.

"So." Dipper began. "I noticed our homeroom teacher's a troll."

"Yeah." Star chewed on her wand nervously. "That was kinda my bad."

Finally! Marco thought. Here it comes. Whenever people experienced Star's magic for the first time, they went through three stages: Terror, denial, and a sort of confused-acceptance.

"And no one has a problem with it?"

Wait, what?

Star scrapped her foot across the ground bashfully. "Honesty? She kinda looks better this way."

"Makes sense." Mabel commented.

While Marco couldn't disagree with Miss. Skullnick's appearance, the fact that these guys weren't fazed by their teacher being a completely different species was unacceptable.

"Okay. Who are you?" The boy demanded.

"We are…" Mabel mimicked Star's movements from earlier (aside from the flaming rainbow and random critters). "The Mystery Twins!"

"C'mon Mabel." Dipper slapped his forehead. "It's okay when we call ourselves that, but the name's still embarrassing."

"Only if you let it be." His sister stuck out her tongue.

"Anyway." The boy turned back to his guides. "Let's just say we're used to this kinda thing."

Marco was about to scoff at the claim, but Star interrupted.

"You mean you know about Earth Magic?!"

"I guess so?" The brunette answered. "I never thought to consider it unique to Earth before."

The Princess turned to her friend. "And you keep saying magic doesn't exist here."

"It doesn't!" Marco shouted. "He's making stuff up!"

Mabel looked at the boy sympathetically. "Hey, it's okay. It's not like it's a well-known fact."

"Yeah." Dipper agreed. "It typically only congregates around natural soft spots in reality."

"This makes absolutely no sense." Marco said.

"Trust me, we've been studying this stuff for the past two years."

Mabel rolled her eyes. "He's been studying it. I'm just there to save his butt!"

"Hey! You only rescue me 50% of the time at most."

The twins stuck their tongues out at each other.

"Bleh!"

"Bleh!"

"I like these guys!" Star bounced on her heels.

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After school, Dipper was ready to part ways with their tour guides, but Star insisted that the twins walk home with her and Marco. Mabel, of course, agreed. It was obvious the girls had found a kindred spirit in each other, but the Pines boy was surprised by how much attention was paid to him. At every opportunity, the princess would quiz him on 'Earth Magic'. While usually eager to share his thoughts and theories, Dipper revealed as little as possible. After all, y'know, trust no one.

Then there was Marco. After years of being bullied, Dipper recognized animosity when he saw it. Based off their guide's personality and interests, the teen saw him as a potential friend. Apparently the feeling wasn't mutual. From what he understood, Marco had spent a ridiculous amount of time convincing his bestie that magic didn't exist on Earth. Now all that work had been undone. The boy didn't trust the newcomers, the irony of which wasn't lost on Dipper.

"So why exactly did you transfer here?" Marco asked.

"Our school burned down." Dipper answered.

"In a totally unsuspicious way." Mabel added quickly. "The police report said it was an electrical failure, not arson at all. So, y'know, we weren't involved. We have a solid alibi too."

"Oookay…"

Dipper slapped his forehead again.

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When the Diaz residence came into view, something strange? happened. A tear in space appeared in front of the teens, and a battalion of monsters jumped out.

"Ludo!" Star growled, eyes narrowing.

"Get behind us!" Marco shouted at the twins.

But Dipper and Mabel had already run forward, knocking down a nameless minion in the process. The girl pulled something from beneath her sweater and cried, "Grappling-hook!" firing it at another creature's head.

Meanwhile, Dipper drew two black objects from his backpack. He tossed one to his sister, then slipped the other over his fist, K.O.-ing Deerbeard with the knuckleduster.

Well-armed, the twins made short work of the monsters. Mabel kicked Spikeballs in his spike-balls, as Dipper manhandled Man Arm.

Marco and Star were as confused as Ludo. Dipper used this opportunity to charge the diminutive leader. He knocked away Ludo's staff, and held the tiny monster in a chokehold. "Stand down!" He barked at the army, while their leader turned blue.

Mabel took her place beside her brother, an intimidating glare on her face.

Shaken out of her stupor, Star yelled, "No! Stop!"

Surprised by the demand, Dipper dropped Ludo, who scooted a few feet away.

The princess marched up to the siblings and said, "That's not how we do things!"

"But," Mabel stammered. "But they attacked us."

"They always attack us!" Star fumed. "That's their thing!"

"You mean this has happened before?" Dipper asked incredulously.

Remembering these guys were new, the blonde calmed down (but only slightly), "Ludo has been trying to steal my wand since I got it. He comes after us, like, every other day."

The twins shared a glance. "And you haven't, y'know, gotten rid of him?"

Star and Marco gaped in shock.

"No, no, no!" Dipper waved his hands and hurried to explain. "I didn't mean kill him (not necessarily). I meant, like, imprison him, or banish him to the outer void, or something."

"He's not really that much of a threat." The girl said. "We can handle him. Plus it's kinda fun to beat them all up."

Dipper looked away and rubbed the back of his neck.

Hoping to mend the conflict, Mabel said, "Maybe it's a cultural thing? We're kinda used to enemies trying to kill us, so, y'know, we just jumped into things."

Star let out a sigh. "It's okay. You're warriors, and you acted as such." Then she lifted her head, and took the tone of the leader she was destined to become. "But this is my fight, and you will follow my orders."

Marco had never seen this side of his friend, he was as shocked as the newcomers by her commanding presence. The twins nodded in consent.

But before Ludo could skulk away, Dipper stopped him. Having experienced a transdimensional invasion firsthand, and determined to not let it happen again, he said, "Earth and all its inhabitants are under the protection of the Pines. If you don't know that name, ask the Nightmare Realm."

"And I'm keeping your hat!" Mabel added, plucking the carnivorous-cow skull off the monster's head, and placing it on her own.

Ludo and his army made a hasty retreat. The friendly atmosphere slowly returned, and everyone calmed down.

Except for Marco, who screamed, "What the hack is going on here!?"

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I like both these shows, and the idea of the characters meeting (especially since they all live in California during the school year). I also like the idea of the twins being so used to magic at this point that they're completely unfazed by anything weird happening around them (They may seem a little OOC towards the end, but think about it: Underneath all the humor, Dipper and Mabel experienced some really horrific things in Gravity Falls. Now add a second eventful summer to that. I think by age 14 they'd be pretty hardcore {and emotionally traumatized} but mostly hardcore).