OK so a lot of people don't understand svs story so here I'm going to explain it
first i suggest you to watch all the parts and not only one part in the middle because you'll be completely lost.
second who are the good guys and who are the bad guys
Sonic And Shadow Are the good guys but still shadow don't work with sonic.
there are more good characters like amy cream tails and knuckles etc.
the bad guys are well only devil chao and the people that devil chao makes to destroy sonic like metal sonic or evil knuckles.
next episode will explain sonic that evil super sonic and dark sonic are actually him.
if anyone didn't understand anything then pm me or just comment.

9x9 out
(i didn't say tal because it doesn't sounds cool).