Rainbow Dash and Sonic's Adventure

Sonic and Rainbow Dash swiftly moved through the streets.

"Who do you think it was?" Rainbow Dash asked.

Sonic just kept his serious face turned towards the road ahead of him. When they arrived, they saw a terrified Rarity.

"Rarity! Are you alright!? What'd you see!? What'd you hear!?" Rainbow Dash demanded.

The scared pony turned her head to look at her, and then saw Sonic.

"Ah!" Rarity shrieked before protecting herself. "Please! Don't hurt me!"

Sonic ran over to and comforted her.

"It's alright! It's Sonic! Remember me? Sonic the Hedgehog!"

Rarity looked up at the hedgehog and eased up a bit.

"Sonic? Sonic!" Rarity cried and hugged him. "Oh Sonic, it was awful! It had the most terrible eyes! They were blood-red! He said "Chaos Control!" and before I knew it he was standing before me! He took my precious emerald!"

Rainbow Dash zoomed out of the store, which she had gone in when they weren't looking. Sonic could see a hint of jealousy on her face as Rarity hung on to him.

"It's okay now, Rarity, it's gone." Sonic said softly.

***

"Princess, we were too late." Rainbow Dash sighed, head drooped as if she'd failed.

"No, Rainbow Dash, you weren't. You have obtained three emeralds, correct?" Princess Celestia asked.

"Yes, we have." Rainbow Dash replied.

"If we put those three emeralds out where the thief can detect them, then maybe we can trap him." Princess Celestia plotted.

"Ah-ha! Dashy and I can stay up and jump him!" Sonic agreed to the plan.

Later that night...

Rainbow Dash struggled to keep her eyes open as she and Sonic hid behind a vase in the destroyed foyer. She kept leaning on Sonic and drifting off, only to snap back awake again.

"Dashy... got to sleep." Sonic whispered.

"No, no! It's fine!" Rainbow Dash replied in a hushed voice.

Sonic looked at the three Chaos Emeralds in the glass display case in the middle of the room, and then at the hole that Rainbow Dash had made. She once again put her head back on Sonic, but, this time, he stroked through her maine to calm her. This action made Rainbow Dash relax and finally drift off for the last time.

Sonic had finally fallen asleep before the shattering of glass was heard. That made him and Rainbow Dash jump up in a flash. There indeed was a being in the room, he was stealing the Chaos Emeralds.

"You're gonna pay for this, you creep!" Sonic yelled as he jumped up.

Before the thief could move, Sonic placed a powerful kick on its head. The three emeralds, plus the two that had been stolen flew up. Rainbow Dash swiped them right out of midair. She landed on the ground perfectly, some dust flying before her. It was so dark that they couldn't see who the thief was. Suddenly, it pulled out an extra emerald.

"Six!" Rainbow Dash cried.

The thief turned towards her and saw that she was holding the five Chaos Emeralds.

"Chaos Control!" the thief shouted before disappearing in a light blue light.

"He's gone!" Sonic gasped.

The light that the Chaos Emeralds radiated allowed him to see Rainbow Dash. Out of nowhere, the thief appeared above her head.

"Watch out!" Sonic cried.

But, it was too late. The thief smashed his leg into Rainbow Dash's skull. She dropped all the emeralds and landed on the ground.

"No!" Sonic shouted as he fell on the floor.

The thief scooped up his prizes.

"You son of a...!" Sonic screamed before turning completely black.

"That looks like-!" the thief muttered urgently.

Rainbow Dash looked up with the little strength she had.

"Sonic! Have you lost your mind!?" she exclaimed.

Sonic stood up, as black as night. He was his dark form!

"Sonic! It's me-" the thief couldn't finish his sentence before being punched through the wall of the castle.

He landed outside and stood back up, very hurt. He let out a deep growl before his whole body turned red with rage. Dark Sonic was out the hole in a flash, ready to attack at any moment.

"Chaos..." the thief began before disappearing.

Rainbow Dash dragged herself quick enough to see the next amazing event.

"BLAST!" the thief screamed when he reappeared and put his hand around Dark Sonic's throat.

There was a huge explosion and the castle was engulfed in a red light of power.

"Whoa!" Rainbow Dash shouted as she watched it happen.

When the light cleared, the thief was gone. The only thing that remained was an injured Sonic. Shining Armor, Princess Cadance, and Princess Celestia came running out the castle to Rainbow Dash.

"What happened!?" Shining Armor demanded.

Rainbow Dash was too shocked to speak. When she noticed Sonic struggling to stand, she immediately ran to his aid.

"He... he... got away..." he croaked.

"It's fine, Sonic! We can get those emeralds back!" Rainbow Dash reassured him.

"I'm out of time..." Sonic panted.

"Don't say that!" Rainbow Dash started to cry.

"No... we're out of time, Dashy..." Sonic choked his last words and pointed to the sky before collapsing.

The sky was evilly swirling with a dark aura.

"Oh no! It's happening!" Princess Celestia gasped.

But, Rainbow Dash wasn't focused on the evil that was stirring, she was more concentrated at the collapsed Sonic.

"Sonic! Sonic!" she cried, and nudged him.

When she saw his lifeless hand hit the ground, she knew it was game over. She busted into a fit of sobs, not even trying to fight it. She drooped her ears and just let the tears flow.

"Princess Celestia! The six Chaos Emeralds we had are gone, and the evil is here! What do we do?" Shining Armor asked urgently.

For the first time ever, Princess Celestia spoke these three little words,

"I don't know."

"So that's it!? We just give up!?" Rainbow Dash growled turning to the royal ponies. "Sonic gave his life to save our rumps! Now are just gonna let his valor go unpaid!?"

"Please, Rainbow Dash, it's too late." Princess Cadance said as frankly as she could.

"No! Let's show that creep the real power of Chaos Control!" Rainbow Dash replied bravely.

Princess Celestia walked up to Rainbow Dash and said these next words.

"Rainbow Dash, I respect you. If you truly believe you can collect all the emeralds and stop the evil, it is possible. And it's not too late for Sonic either, the Chaos Emeralds are capable of anything."

Suddenly, there were screams coming from Ponyville.

"Help! Help! He's stealing the emerald!" a country voice screeched.

"I'll stop em'!" Rainbow Dash shouted.

"No, wait, he'll lead you to the true enemy." Princess Celestia said.

There was a burst of gold light coming from the town.

"The thief can go super!"