Eggman sends Metal Sonic to find Shadow the Hedgehog, and lets them know of Nega's plans. He crosses paths with Espio the Chameleon, who is also on the case of the missing Chao, and they work together to save the world. In order to make a new future, he steals the Chao that are left in order to hide them. Meanwhile, Silver the Hedgehog has returned from a now ruined future caused by the Ifrit. The Master Emerald has also gone missing (again) and Knuckles the Echidna teams up with Rouge to find it. Eggman Nega thusly hires Rouge the Bat to collect the Chaos Emeralds. However, to open the portal to Ifrit's world, the seven Chaos Emeralds are required.
After that, he plans to release the Ifrit into the world in order to destroy it. His plan is to feed them to an inter dimensional beast called the 'Ifrit' who needs to eat them to become invincible. It turns out that Eggman Nega (once again masquerading as Doctor Eggman), has stolen the Chao and hidden them inside a haunted mansion. The Chao have gone missing and Sonic the Hedgehog and Miles 'Tails' Prower immediately get on the case to find them.
