This takes place after Sonic the Hedgehog 2006. The characters don't remember the events because after they defeated Solaris they went back in time and made it so they never happened.

Sonic and the City of Gems
Chapter 1: The Message
"Yahooo!" Sonic yelled as he sped down the road in his motorcycle. Amy, Cream and Cheese and Tails were watching him from a nearby hill. They have a picnic set up.

"Darn you Sonic," Amy said. "This was supposed to be a day of relaxing! You just couldn't help yourself, could you!"

"I'm surpised he's even on that thing," said Tails. "He's never cared about using vehicles before. He's always loved running!"

"He's really slowed down lately," said Cream. "Nothing's really happened since Shadow defeated Black Doom."

"Come to think of it, I haven't seen Shadow lately,"Amy said. "I wonder what he's doing."

Sonic continued his high speed down the road. He saw turtle robots with cannons on their backs destroying the bridge ahead.

"Aww," Sonic said. "Not now Eggman!"

Sonic brakes the motortcycle and jumps off. While still in the air, he used homing attack on one turtle, destroying it. He then jumped to another turtle and landed on it. Another turtle aimed its cannon at him. Sonic jumped off the turtle and it was hit by the other turtle's blast. He then jumped to the other turtle. Before Sonic landed on it, it startes to charge up a blast. Sonic landed on it, grabbed it's cannon, and bent it so that it pointed down. It was to late to stop the blast as the turtle blew itself to peices.

Sonic landed on the ground and looked for his motorcycle. He noticed it on the edge of the road. It was blown off of the hill and into the water below by the explosion.

"No!"Sonic said. He watched as the motorcycle slowly sunk to the bottom of the ocean.

"Arrgh!" Sonic said, punching the ground. "Eggman, You'll pay!"

"Chill out, Sonic."

"Huh?" Sonic said, looking up at Amy. "Oh, hey Amy."

"Cheer up," Amy said. "You can always get another one."

"Or I can make you one," said Tails. "Just for you."

"Cool!" said Sonic, giving Tails a thumbs-up.

"Look," said Cream, pointing up. A letter floated down from the sky. Cheese flew up and grabbed it. It was a video letter, like the one Eggman sent in Sonic Heroes. Cheese gave it to Sonic, and everyone gathered round as Eggman began to speak.

Greetings Sonic,

I have now created my most spectacular machine. I am not telling you what it is or does, you'll just have to come to my base and see! If you want the planet to survive, you'll have to obey me! See you there!

Eggman

"This again?" Sonic said. "He's said this before! And then we ended up fighting the Egg Fleet!"

"Hmm, I think it's a trick." Amy said.

"It may be, but we can't assume he's lying." said Sonic. "Let's go Tails, we're going!"

"Okay! I'll get the X-Tornado!"

Tails flies off to get the X-Tornado. Sonic sat down, leaning back on a wall on the bridge. He looked up to the sky.

What is Eggman planning this time? Doesn't he ever tire? At least the last time he told me it was a weapon. What could it be? Another Egg Fleet? Another big mech? A giant laser like the eclipse cannon? What HASN'T he tried yet? Sonic thought.

"Sonic, look out!" Amy yelled.

Sonic snapped out of it and got out of the way as the X-Tornado touched down.

"Ready Sonic?" Tails asked.

"Oh yeah!" Sonic says. "Time to crack that Eggman wide open!"

Sonic jumped into the X-Tornado. "Amy,Cream, stay here!"

"Okay." Amy said sadly.

"Don't worry Amy. we'll be alright!"

"Hey! Sonic! Wait!"

"Huh?" Sonic said. "Who's that?"

Everyone sees a red figure running down the road, coming straight toward them. When he gets there, everyone recognizes him.

"Oh, hey Knuckles!' said Sonic. "Long time no see!"

Sonic jumps down from the X-Tornado and he and Knuckles shake hands.

"It's good to see you and all Knuckles," Tails said. "But me and Sonic have got to get going! Eggman's causing trouble again!"

"That's just it, Tails,"Knuckles said. "I got a letter from him telling me to come to his base!''

"You kidding? Us too!'' Sonic said, with a little joy in his voice. "Well, hop in!"

Knuckles climbs in and Sonic jumps back in. "Bye guys!" Amy and Cream said as the X-Tornado takes off into the sky.

"Oooh!" Amy said, stomping her foot on the ground and clenching her fists. "That stupid Eggman, taking my darling Sonic away from me once again!"

Sonic, Tails and Knuckles, flying in the X-Tornado, all wondered what Eggman could be planning THIS time. Knuckles thought of the time when they all faced Chaos, the humanoid water creature. He remembered battling Chaos 6 aboard Eggman's Egg Carrier, and the battle against Perfect Chaos in the end, when Eggman lost his control over Chaos and it blasted his Egg Carrier out if the sky; his plan backfired.

Tails thought about the day Sonic found Emerl, a.k.a. the Gizoid, and the days with him thereafter. Everyone had possession of the robot at one time or another, and all wanted him for different reasons. Rouge wanted to turn it into a master thief, and Shadow sensed that, despite their efforts to humanize him, Emerl was still designed and programmed to be a weapon of mass destruction. In the end, though, Chaos somehow returned, and Emerl defeated it and challenged Eggman, who was going to use the Final Egg Blaster to destroy thr planet, aboard the Death Egg. Emerl aslo malfunctioned and went haywire, and almost destroyed the planet. Sonic had to fight him, which resulted in Emerls destruction.

Sonic thought about what happened in between what Knuckles and Tails thought about. he thought about when Eggman unleashed Shadow, and the two hedgehogs fought many times. In the end, when Eggman's plan backfired again, the two had to team up to fight the Biolizard and the FinalHazard. Sonic also remembered the battle against Metal Sonic, a creation that aslo turned on Eggman. Sonic, Knuckles and Tails teamed up to face Metal Madness and Metal Overlord.

All three thought about the time the Black Arms' came to earth, and in the final battle between Shadow and Black Doom, Eggman was a big help. But, after that battle he returned to his evil ways, with no one to compete with anymore.

All three caught sight of Eggman's base. It was just as big as his air base from Sonic Heroes, except it was on the ground. They remembered how hard it was to destroy the air base, with its lasers and big robots guarding everything.

"Well guys," said Knuckles."Here we go again."

Sonic, Tails and Knuckles jumped down off of the X-Tornado. Sonic fell, Knuckles glided and Tails flew down into the emormous base. A small ball of light followed them and was unnoticed by them.

"Yes! I can finally contact them," said a voice coming from deep inside the ball of light.