Flashbolt157ninja
Sonic and Shadow join forces with Mario and his friends in order to stop a threat known as Hyper Mecha Sonic, a being formed of Metal Sonic, Mecha Sonic and Silver Sonic with Metal Sonic serving as the brain. Mecha Sonic seaks the Chaos Emeralds, artifacts from Sonic's world that, when gathered together, grant the user immense power. He seaks them out for the sole purpose of killing Sonic and everything he cares about. However, it's not all that simple, as several of the Mario villains are after the Chaos Emeralds as well, meaning Mario, Sonic, Shadow, and Luigi need to gether them before Mecha Sonic, or anyone else, for that matter, manages to get their hands on them.