The time has come once more. In the wake of the remaster to the original "Sonic Generations" game comes this new story adapting its companion story, "Shadow Generations."

While on a mission to investigate a security breach at the ARK, Shadow is confronted by a face from his past and subsequently finds himself drawn into a whole new space where two worlds are colliding. The inhabitants of this other world don't matter to him. They're not part of the world he swore to protect.

Right now, his focus is on confronting this old enemy from his past and dealing with the changes this strange space is causing in his body. And along the way, he'll meet faces, new and old, that just might help him make the choices that will once again determine his destiny.

Will he be able to reconcile his past when confronted with it once again? Are the inhabitants of this new world truly worth nothing to him or will they prove that they are more than they seem? And will he find harmony amongst all the chaos?

Find out in "Shadow Generations: Harmonia in Chao!"