Chapter 10: Chaos
Eggman didn't know it was his home world at first and as usual, he plotted to conquer it. He used help because his machines always backfired. For example when he got all seven Chaos Emeralds again and put them in his robot, it went on a rampage obeying no one but itself. Eventually Chris, a human friend of Sonic's who had saved Sonic from drowning, got the emeralds away from the machine and threw them to Sonic, who transformed to his Super Form to defeat Eggman's rampaging robot.
Eggman's first partner was a liquid being called Chaos. Chaos had the power to absorb the energy of the Chaos Emeralds to transform himself, but it wasn't super transformation like Sonic. Eventually Chaos became to powerful for Sonic to handle, luckily with Knuckle's help Sonic was able to keep beating Chaos as it improved with each Chaos Emerald. Unfortunately Chaos eventually obtained all the Chaos Emeralds and betrayed Eggman and let out his rage that had been bottled up for centuries. When Chaos had completely drained the Chaos Emeralds of their energy he spat them out and scattered them. Sonic and his friends were able to gather them, but they proved useless without energy. Then a female echidna named Tikal came to their help. She and Chaos had been sealed in the Master Emerald when Chaos went on his first rampage centuries ago. She told Knuckles to restore the power of the Chaos Emeralds using the Master Emerald. With the emeralds restored Sonic transformed and defeated Chaos, who returned to his normal state. Chaos finally let go of his rage when a small group of chao came to him. It turns out that when the echidnas had gone to take the Chaos Emeralds from Chaos, the original guardian, Chaos thought they were hurting the chao and got angry at the echidnas.
After Chaos' rage subsided, he returned with Tikal to the Master Emerald, where they re-sealed themselves back inside of it. Tikal and Chaos were never seen again.
After the battle, GUN, the military force of the country Sonic and his friends were in, started developing more advanced robots to fight Eggman. When Eggman saw this he analyzed them and found that the designs were very similar to his. He hacked into the government database and found exactly where they got those designs. Eggman had found his grandfather; Gerald Robotnick's computer diary. But, the robot designs were not the only things he discovered...