"Welcome to our elite team, Agent Silver" It all started with the usual fight between Sonic and Shadow. But this time, things do not go as well as they should have been... First: The 7 powerful gems of Mobius, also known as the Chaos Emeralds, mysteriously go missing. And soon enough, a terrible disaster happens to them and the Master Emerald. Second: Finding the emeralds and fixing them back to the way it was is no easy feat. Turns out, Eggman is not the only villain around here. All because a certain someone opened the portal to another universe... Third: Things rapidly go out of control as the fate of the two universes lie in the hands of a time travelling hero. Will disguising himself as a human agent really help Silver the hedgehog save the world? Inspector Gadget and his elite team soon join forces with Sonic and his gang as they unravel the mysteries to the crisis. As the heroes gather their allies, Eggman makes a deal with Dr. Claw. What is his plan? Who has the emeralds? A tough fight awaits our new heroes and villains. Will Silver be able to fix this catastrophe in time or will the power finally fall into the wrong hands?