Ok, in this version Knuckles is a freedom fighter and Shadow normally acompanies them on their missions. Enjoy!
Death Egg, 12:21 AM
Sonic had just defeated Dr, Eggman's Death Egg mech. Then, a black emerald crashed through the roof and right into Sonic's chest. Sonic screamedin pain as blood gushed out of the wound, and Sonic began to change. "Ahhh!" He cried in pain as his fur changed to black. His short tail grew in length and turned lizard-like. His small fangs turned into HUGE fangs. He let out an animalistic growl as he grew twice his original size and grew red and black wings. Dr. Eggman said, "hehe... are you okay?" Sonic looked over and snarled, showing his transformed black teeth. "I'm fine, fool." Sonic said. The freedom fighters rushed in on the scene. "What happened to you, Sonic?!" Sally said in shock. Sonic just pointed to the black emerald inside his chest, and flew off.
G.U.N headquarters, 6:45 AM
"Sonic transformed into some kind of...monster!" Tails said to Shadow, who was listening. "Is faker with you guys?" "No, he just flew off last night. We haven't seen him since!" Shadow nodded, then went out into the hallway. "SHADOW!" A seriously injured officer said. Shadow turned around and was shocked. "Something is killing everyone!" Shadow ran over to where the officer pointed, followed by Tails
Tails and Shadow arrived at a room where G.U.N officers where fighting a monster that was trying to get to the Chaos Emerald. Shadow ran in and saw the monster with the same description Tails said! "Faker, why are you doing this?!" Sonic kicked a G.U.N officer of him and looked at Shadow. He just smirked and took the Chaos Emerald out of the pedestal.
Shadow instantly threw 5 Chaos Spears at Sonic. They crashed into him, and he shrieked in pain. He slashed Shadow and threw him into a wall. Tails stood in awe at how strong Sonic was, defeating all 125 of the G.U.N soldiers that protected the emerald. Sonic flew off with the Chaos Emerald. "Dammit!" Shadow said in anger as he got up. "He got away!" Shadow said. Tails sighed and got in his X-Tornado to look for Sonic.
Sonic landed in the Freedom Fighters base and went to his room. He slammed the door shut and locked it before putting the emerald under a loose floorboard. He chuckled darkly and went to Tails room. He took 4 Chaos Emeralds that were siting on the desk in the right corner of the room. He went back to his room, and stuck them in the floorboard. He then flew out of the base to search for more emeralds. Suddenly felt felt something painful stab him in the tail. He suddenly felt tired, and fell asleep.
2 hours later...
"Sonic!" That was insane!" Tails said as Sonic woke up. Tails was looking at Sonic's fur with a tweezer in the left corner of the room. Sonic rose up from the medical bed and looked at Tails. Tails had the Chaos Emeralds that Sonic hid under the floorboards. Sonic growled, and Tails could hear him. Tails looked at him in shock and asked, "Why did you... growl?" Sonic looked at him and said, Give me those emeralds, now." Tails was intimidated, but he didn't give him the emeralds. Something is wrong with you, Sonic. And, why did you take these from my room?" Sonic didn't reply. Tails looked at Sonic with suspicion,but shook it off. Sonic snarled. "Give me the Emeralds..." Tails said no and ran out of the lab as fast as he could. Sonic was about to give chase, but soon he couldn't see anything. He fell asleep as darkness filled his eyes...
Tails looked behind him and noticed Sonic was not chasing him. He looked in the lab and saw Sonic sleeping. He sighed in relief and went to his bedroom. He fell asleep and had a horrifying dream.
Tails woke up in a prison cell. He had multiple cuts on his skin, and some of his fur was black. Then, he realized he couldn't move. He was dead! Dr. Eggman was laughing manically at his corpse. Tails was furious, but he couldn't move. Sonic was at his side, shaking him and trying to revive him. "IT'S TOO LATE, RAT!" Sonic's sadness soon turned to rage. "YOU..." Sonic said as claws started to rip out of his gloves. "KILLED HIM!" Sonic roared with rage and fury and he grabbed the doctor and slammed him into the ground so hard it broke Dr. Eggman's ribcage. Sonic laughed darkly and ran towards the madman. He slashed at him, and blood leaked onto the floor. Tails screamed in fear, and tried to move, but to no avail. Sonic grinned, and kicked the Doctor. He gasped and wheezed as the air was knocked out of him. Soon, he killed him, and threw his corpse of the ledge of the Death Egg. Sonic stayed silent. The Freedom Fighters ran over after totaling Metal Sonic. They gasped after seeing Tail's dead body, and saw Sonic, with blood on his hands, accused him. "Faker killed him!" Shadow said. Sonic glared at him. "HOW DARE YOU ACCUSE ME OF KILLING HIM! HE WAS MY BROTHER!" Sonic roared in rage. Knuckles then saw the trail of blood. "You killed Eggman?!" He asked in horror. "Obivously. He never deserved to live..." Shadow ran up to attack Sonic, but Sonic grabbed him by the neck with his tail. "You should die, too..." Sonic snarled, strangling him. Shadow yelled out in rage, and Sonic threw hi against the wall. Sonic chuckled evilly. "You all deserve to DIE..."
Tails woke up in a cold sweat. "Did I just... predict the future?
And that's the start of my second story! This story is pretty violent, and you could probaly tell who's gonna die, sadly. But wait, Tails fans! He's not completely out of the story! Actually, Tails is a HUGE character in this series! So please stick around and even Review! CYA!