This, of course, is a Sonic the Hedgehog AU that crosses over the Blue Blur with various other franchises, all put together into one continous comic!
If you aren't familar with Sonic and any of this interests you, I's suggest you check out the most recent game in the series, Sonic X Shadow Generations. While I adapt more than just that game in this comic, I will allow you the chance to play the source games and get familar with their stories so that you understand what is going on.