Just so you know, I didn't copy this from anyone. I got the idea from Phineas and Ferb, Mission Marvel.

Chapter 2: Something Is Very Wrong

When the white light cleared, everyone was staring shell-shocked at the empty broken cylinder on the ground.

The eight demigods felt dizzy and disorientated as they stood and collected their bearings.

Further behind them, the younger sons of Hephaestus and the seven daughter of Hecate were nervously moving towards the door.

"Not so fast." said Annabeth, pointing at them. "You stay right there."

They froze and turned with sheepish looks on their faces.

Leo sighed. "Don't experiment with random ingredients like that, okay? It's very dangerous."

Piper was still clutching her head. "What was in that cylinder?"

"Hydrogen." said Julian nervously. "Sorry."

"Well don't do that again." said Leo. "You three are grounded and no offense but I don't want to see you girls here again either, alright?"

They glanced at each other.

"Aren't you going to answer him?" said Annabeth.

"Okay." they all mumbled before filing out.

Nico sighed. "That was a mess."

"My head hurts." Piper mumbled.

"We should get you over to the Poseidon cabin." said Jason worriedly.

The Poseidon cabin had a bunk for each of them. Percy had one, obviously, but since they all hung out in here so much, there became a habit for each person to leave their things on a particular bunk each time they came. His cabin usually got at least a three out of five now, because they all shared in the cleaning.

"Is the headache still hurting, Piper?" Annabeth asked when she had lied down.

"Mm hm." she answered with a groan.

"I'll better find Will or some other son of Apollo." said Jason, standing up.

"I'll come with you." Nico followed him out.

Hazel and Frank looked at each other awkwardly. "Um, we sorta had something to do today…"

"Yeah, go." Piper interrupted. They shot her grateful smiles and left.

"Hydrogen shouldn't do this to you." Leo muttered. "And why would it just affect you? I swear, of they were lying about the contents of that cylinder—"

"Maybe it's best if we go see if there's any trace there." Annabeth suggested. "Percy, you stay here with Piper."

"What? Uh, no." he said, since he and Piper weren't very… close with each other. It would be far too awkward if they were alone together with nothing really to talk about. "Why doesn't Leo stay?"

"Well that would be against the point, wouldn't it, Captain Saltwater?" Percy raised an eyebrow at Leo's nickname.

"Tell you what," said Annabeth. "I can stay here with Piper while you two go. Okay?"

"Yeah." said Piper faintly. The two boys glanced at each other warily before going off.

Jason and Nico walked towards where some sons of Apollo were showing off playing basketball right in front of the Aphrodite cabin, in which the girls were leaning out of the windows and swooning.

"It just doesn't make sense." Nico was saying. "Why on earth would that stuff affect Piper but not the rest of us?"

"I don't know." said Jason with a shrug. It was really odd. "But I hope she gets better soon. Maybe Leo should—"

Suddenly, he tripped and fell. Nico reached down to help him. "What happened?"

Jason tried to get up and found that his foot was stuck in a small crack that had appeared on the ground.

"Okay, not funny Nico." he groaned, trying to get his foot out.

Nico was confused. "What?"

"The crack. I'm not really in the mood." he said distractedly.

"I didn't do it." Nico frowned.

Jason stopped for awhile. "Um, can you at least open it a little wider then?"

Nico nodded and held out his hand. However, nothing happened.

Now they were even more confused than before. None of them could understand what in Hades was going on.

"What's happening here?" asked a voice. The two boys noticed that the Apollo kids had stopped playing basketball and had come over to them.

"Very funny, Nico." said Will. "Now let go."

"What?" said Nico again, getting frustrated. "I didn't do it!"

"Who else can crack the ground?" he reasoned.

"I don't know! It wasn't me!" he almost yelled.

"Um, Nico…" Jason had gotten free, and was now staring at the crack in the ground with wide eyes.

"Jason! Don't tell me that even you—"

"Nico! Stop doing that!" he yelled back.

"Doing what?!"

"That!"

Jason gestured mainly at Nico and he looked down to find electric blue sparks shooting off himself.

The Apollo kids all gaped at them. They stared at each other in shock.

Frank and Hazel walked towards the strawberry fields with their picnic basket.

"It's a shame about Piper." said Hazel guiltily.

"Yeah, I sorta wish there was something we could do to help." said Frank.

"Sorta?" she asked.

"Well, for now I still would rather have a nice little picnic like we planned." he said sheepishly. "Guess that makes me a bad person."

She stopped and began spreading out the picnic blanket. "Well, I feel the same way actually. Am I a bad person?"

Frank shook his head. "No, of courses not."

She pulled him down to sit next to her. "Then you're not a bad person either."

They smiled at each other and leaned in for a kiss until suddenly.

"You have ears." Frank said.

"Huh?"

"Cat ears." he gasped, reaching up. She felt him touch… somewhere above her hair. But…

"I have what?!" she felt her head and indeed there were pointy furry ears there. "How?!"

"And a tail." he said, shocked. She looked down and saw a Ginger-striped tail twitching on the grass. It came from under her skirt. "We have to get to the others."

He helped her up and they turned to see a trail of diamonds leading up to them from far down the hill.

"What…" they both gasped, instinctively moving back.

Hazel noticed more popping up… near Frank. "Frank, look down."

Frank stared down at his feet and quickly moved away in shock. The diamonds kept popping up in his footsteps.

"What the…"

"If Piper doesn't get well soon then those three are going to be grounded for a month." Leo muttered. "They make a mess with most of their experiments."

"Seems to run in the family." Percy smirked.

Leo glared at him. "Ha ha, very funny."

It is pretty funny.

Leo was confused. "What?"

Percy gave him a curious look. "Something wrong?"

"Who said that?"

I did. Course you can't hear me, fireboy. Hey boss, I'll be pulling your chariot for the race, right?

"Someone definitely said something that time." Leo gasped.

"I didn't hear anything." said Percy. "I think you're hallucinating, since Piper has a headache."

Aw, come on boss, don't just keep ignoring me like that!

Who are you, anyway?

Woah, you're not— how are— who are—

I'm Leo and did you just read my thoughts?!

!

"Leo, Leo!" Percy was shaking him.

"What?"

"You spaced out there." Percy was confused. Maybe he really was delusional. "I think we should head back to the cabin instead, just to make sure you're not imagining things."

He nodded gratefully. "Good idea, I really think I am."

They turned around and began walking back instead. Annabeth would know what to do.

"Hey boys!" called a voice. A familiar figure came running up to them.

"Hey Thalia." said Percy. "What are you doing here?"

"Camp is having a chariot race, and the hunters wanted to try it out." she explained eagerly.

"Really!" he gasped. "Awesome!"

Leo and Thalia gasped, then he did too.

"Help! Help! I'm on fire! And…" he suddenly stopped. "And I'm perfectly fine."

Annabeth glanced out the window and noticed all the others as well as Thalia all come running towards the cabin. What now?

Shout out to the first person who can guess who all the demigods swapped with!