Sonic the Hedgehog: The Mystery of Nazo

Summary
Sonic Story: Sonic is helping out Tails by testing his new Sonic Sneakers, but gets attacked by a Chaos Emerald-powered Egg Fu. Eventually, Eggman creates an adaptable Gizoid that is stolen by GUN and turned into a creature meant to hold the spirit of the ancient God of the Underworld, Destruction, and Death, Nazo.

Shadow Story: Shadow is working for GUN as an agent once again. He has to capture each of the Chaos Emeralds for GUN, whom are secretly planning something. At the end, Shadow has to face the result of PROJECT Nazo, as well as the Chaos Squadron. Partners: Omega and Rouge.