"The Good, the Bad and the Unknown (Part 1 of 4): Prototype": It's all been leading up to this: Shadow is back and he's looking for a showdown with Sonic! As if that wasn't enough, other threats both old and new are lurking in the darkness... and with an event this big rocking Sonic's world, could the attention of Dr. Robotnik be too far off? Don't dare miss what may be the direst situation Sonic has ever faced!