What's up? Time for a new fanfic and my first Crossover fanfic. One thing you guys may not know about me is that I'm a huge fan of Sonic the Hedgehog. Like, HUGE fan. Sonic's actually been my favorite game series since I was a kid. My favorite characters are Sonic and Shadow. My brother is a fan of Knuckles and Manic from Sonic Underground. But this fanfic won't have Shadow or Manic involved. Now another game series I am a big fan of is the Megaman X series. So I thought, why not put my two favorite game series together in one story? The idea for this was inspired by the "Worlds Collide" Sonic x Megaman comics and the Metal Sonic vs Zero Death Battle. However, this fanfic will not be based on the comics at all. One or two things, but no more than that. I'm pretty excited to get this started. So let's get to it. Without farther adieu, Sonic and Megaman X: Blues and Reds Unite to Fight.

Mobius, the home of Sonic and his friends. In a forest outside of the city, in the middle of the night, there was a battle happening. Clashing with each other with high speeds were Sonic and the robot version of himself created by Dr. Eggman, Metal Sonic. Metal Sonic sole purpose was to destroy Sonic any way that he could. But time after time, he would always lose to Sonic. Even with all of his abilities and skills to surpass Sonic, he could never beat him even once. Currently, Metal Sonic was going rogue again and not following Eggman's orders.

As the two clashed with their spin dashes, Sonic had a bit more power into his and knocked Metal Sonic down to the ground. After that, Sonic had a confident smirk on his face as he rubbed his nose.

"Hehe! Looks like the game's up, Metal. You lose." Sonic said confidently.

"Why? Why is it that I can't ever defeat you?" Metal Sonic said as he began getting up. "All the data I have should be enough."

"Metal Metal Metal. You are gonna more than data on my friends just to defeat me." Sonic said while smirking and shrugging.

"Hmmm... perhaps it's not just the data I have here. Perhaps I need data from somewhere else." Metal Sonic said.

"Huh?" Sonic said looking confused.

Metal Sonic then started to charge up his energy. Not just that, the 7 chaos emeralds started to surround him. This surprised Sonic that he had the chaos emeralds on him.

"The chaos emeralds? How did you get those?" Sonic asked looking surprised.

Metal Sonic didn't say anything, he just charged up all the power he had with the power of the chaos emeralds. Sonic quickly jumped back from Metal Sonic. He didn't know what he was planning, but Sonic knew that it wasn't gonna be good. After Metal Sonic's energy peaked, he released it as a giant pillar of light. Feeling blinded by the light, Sonic had to cover his eyes. After a while, the light began to weaken up and when Sonic looked, Metal Sonic was nowhere to be found. All 7 of the chaos emeralds, however, were still here.

"Huh?" Sonic said looking around. He then walks up to the emeralds and picks one of them up. "The emeralds are here, but where's Metal Sonic?"

It was like Metal Sonic disappeared out of thin air. Sonic remember Metal Sonic saying something about needing data from somewhere else. The quest was... where? Sonic decided that he might as well collect the emeralds while they were here. Then... as he picked up the last emerald, he felt a strong surge of chaos energy in the air.

"Huh? What's this weird vibe that I'm getting?" Sonic asked himself.

Sonic quickly ran up a tall tree and looked up at the sky. He sees the surge of energy coming from an island floating in the sky.

"It's coming from Angel Island." Sonic said looking concerned.

Sonic then quickly ran to get his plane to see what was up at Angel Island.

Meanwhile, someone was already on Angel Island. The guardian of the Master Emerald, Knuckles the Echidna. Knuckles stands near the Master Emerald, which is currently emitting a strong amount of energy. This wasn't the first time something like this has happened with the Master Emerald, but this was different. Knuckles could tell.

"What's going on with the Master Emerald?" Knuckles asked himself. "Something like this has never happened before."

"YO! KNUX!" Shouted out someone from behind him. It was Sonic.

"Sonic!" Knuckles said noticing his blue friend.

"What's up with the Master Emerald?" Sonic asked.

"You tell me. I can't make heads or tails of it. It was fine at one point, then it just started glowing like this out of nowhere." Knuckles stated.

"Does it have something to do with Metal Sonic?" Sonic asked while pondering a bit.

"Metal Sonic?" Knuckles said confused.

"Just a while ago, I was battling with Metal. But then he uses the chaos emeralds and just... vanished." Sonic said to Knuckles.

"Vanished?" Knuckles said.

"He left the chaos emeralds, but I don't know where he went. He did say something about trying to get data from somewhere else. But I have no idea what he meant by that." Sonic stated.

"So... it sounds like Metal Sonic is why the Master Emerald is acting like this." Knuckles stated.

The Master Emerald started glowing brighter and brighter. Both Sonic and Knuckles had to cover their eyes.

"Tch! Its power is crazily overflowing." Knuckles said still covering his eyes.

"Yeah! It's nuts." Sonic said also covering his eyes.

As the Master Emerald glowed more, it also started to form cracks in itself. Sonic and Knuckles grunted more from the blinding light. The next thing to happen was a giant green light surrounded both Sonic and Knuckles. It was a similar fashion to Metal Sonic. Once the light as gone, Sonic, Knuckles, and the Master Emerald were all gone. Disappeared without a trace.

Down on the ground, were both Sonic and Knuckles. The two of them slowly began to wake back up. As they got up, the two of them looked around and were both unfamiliar with the surrounding.

"Where... are we?" Sonic asked Knuckles.

"Not sure." Knuckles said to Sonic. "Nothing's ringing a bell."

The two then decided to get a better look at where they were and from a distance, they saw something that caught their eyes. A large futuristic city. The two of them don't recall seeing anything like it before. It wasn't like the city they see in their past adventures. It was... totally different in more ways than one.

"Sonic, I don't think we're on Angel Island anymore." Knuckles stated.

"Angel Island? I don't even think we're on our own planet anymore." Sonic said looking a bit worried.

Wherever Sonic and Knuckles were, they could tell this was gonna be the beginning of a new adventure.

End of Chapter 1.