Sonic arrived at the base which was a old fashion building. He stretched to get ready then ran to the building. Eggman's robots were waiting then fired at the blue hedgehog but fails. He spin dashed robots that was close to him and kicking them away.

"This is too easy!" The blue hedgehog spin dashed through the wall where Eggman was.

"Okay so where's this 'Deathly weapon'?" Sonic asked with a smirk. "Because I'm," Yawn "Tired today so can we get this over with?"

"I'm sorry that you're tired." Cubot commented.

"Maybe we should do this tomorrow?" Orbot asked.

"Quiet you two." Eggman said in an annoyed tone in his voice.

"At least they're nice." The hedgehog commented. "So where's the machine?"

"Over there." He looked to see a potato then picked it up.

"Are you kidding me?" Sonic laughed "Oh man this is a great machine that you ever-" A hole opened from the potato then shot a dart on Sonic's chest, making him fall to the metal ground.

He slowly opens his eyes then shot up when he saw that he was trapped inside a glass tube. And looked to see he was in a lab with the 7 chaos emeralds floating around a bubble.

"What's going on?" The hedgehog questioned. Since the tube was tight, he couldn't use a spin dash.

"Glad you're awake." Eggman commented.

"So what's going on, Eggface?" Sonic asked. "Are you trying to turn me into the Werehog again? And I thought that you learned your lesson the last time." He said laying his back against the tube with a smirk.

"I'm not dumb to release Dark Gala again. No, my plan is to change you into your dark form." When the doctor said that, Sonic turned to shocked

"No...Y-You can't. I couldn't control myself the first time! You can't do this!" The scared hedgehog shouted pounding his fists on the glass. Of course Eggman didn't listen to the hedgehog's pleases.

"Orbot, pull the switch."

"Right sir." The red one pulled the switch as the chaos emeralds glow brightly than usual. On top of the tube opened shooting electricity on the hedgehog's body.

"AAAAAAAAAAAAAHHHHHHHHHHHHHHHHHH!" He curled up into a ball trying to block out the pain. After a minute, Sonic's body got up on its own. His fur turned a dark blue, feeling fangs growing in his mouth and his quill arched. He tries to fight loses when his eyes turned glowing dark green. When the electricity ended, he looked at himself then grinned.

"Finally, free at last." He said with a low voice.

"Hello dark Sonic. It's been a long time, isn't it?" Dark Sonic was silent and frowning.

"Since I helped you, maybe we can work together." Eggman had a confused look when Dark laughed.

"Do you think I can be tame by an old guy?" He punch the glass which worked breaking the glass.

"Oh crap! Robots attack!" The scared doctor shouted. About 30 robots came but only a minute they were destroyed by the dark hedgehog. He saw that Eggman and the red and yellow robots were gone.

"I don't care about the fools right now."

~With the others~

"It's almost sundown. Sonic could have been here by now." Tails said.

"Don't worry about him. He's always alright." Knuckles said which he came to spend time with the gang.

"Mister Knuckles, should you be at Angel island?" Cream asked. Knuckles paused for a moment.

"I forgot to set up the security today..."

"Hey look, it's Sonic." Amy pointed out. Dark Sonic walked slowly on top of a sand hill.

"Hey Sonic." Tails called out running to the hedgehog.

"Oh crap. The brat is coming." He quickly turned back to his normal form.

"Hiya Tails." Sonic greeted with a smirk.

"You must be hungry by now. We were about to eat." Tails informed then ran to the other.

"Chaos he's annoying!" Dark thought then ran to the others.

"Hey guys." Sonic greeted.

"Hi mister Sonic." The bunny said.

"Chao!" The chao said with a smile. Amy hugged Sonic tightly.

"You had me worried." The pink hedgehog said then let go.

"I was only gone for a few hours." Sonic said before a fake chuckled.

"Here's a chili dog and still warm." Tails gave Sonic a chili dog then ate it. But only to spit it out.

"Blah!" He shouted.

"What's wrong?" Tails asked.

"It just that I hate chili dogs." Sonic whispered but only Tails heard it. Tails froze at that.

"You're not Sonic!" Tails hits the hedgehog with his tails on his head, making him kneel down and closing his head.

"Why did you do that?" Knuckles asked the fox.

"Sonic said that 'I hate chili dogs'. He loves them and never get sick of them." Amy held both Cream and Cheese when Sonic laughed and started turning into his dark form.

"You are a smart kid. But too bad you'll die from it." Dark grabbed Tails by his tails and charging up a dark orb on his hand. Then the hedgehog got punched in the face letting go of the young fox.

"I don't know what's going on but stay away them!" Knuckles shouted with his fist out. Dark chuckled at this

"Even with a temper, you'll protect your friends. Is it because they're the only people that cared about a echidna?" Knuckles grabbed him by the neck and winding up a punch

"Knuckles, wait!" Sonic pleased in his form with a bruise on his cheek where the echidna punched him.

"Sonic!" Amy shouted. But Knuckles still holding him, not trusting this so did Tails who's watching.

"Hey come on Knucklehead, let me go." Sonic said with a smirk.

"Mister Sonic is back to normal. Please let him go." The rabbit said with a smile. The echidna listened and let the hedgehog go.

"Thanks guys." Sonic thanked but with his hands behind his back.

"What are you doing behind you back, buddy?" Tails asked with his arms crossed. Sonic smiled then released a dark orb at the girls.

"Watch out!" Knuckles pushed them away but the orb hits his side. Sonic turned to Dark and charging up another orb.

"Leave everyone alone!" Tails punched and slashes him with his tails. Dark slapped the fox in the face

"That won't stop me!" Dark pinned him into the sand then fired the orb at Knuckles. Sand was everywhere

"Knuckles!" Amy called out.

"No...He can't be. Please no." Tails whispered with tears falling. The wind blew the sand revealing a familiar black hedgehog standing in front of Knuckles.

"Shadow!" Everyone shouted.

"You have great timing of showing up in time." The echidna commented while holding his side.

"Let's just say that I ran into the old doctor." Shadow said.

"So you wanna fight, Ultimate life form?" Dark asked. Shadow looked at the girl that are hugging together.

"Let's fight somewhere alone and without any people." Shadow said.

"I know a perfect place." Dark appeared and grabbed the black hedgehog's arm

"Chaos control." Both hedgehog disappeared leaving the Mobians behind.

I hope you like this longer chapter. The next chapter will be the last one. Have a good day :)