Sealed Time

Sequel to 'Playing Columns on the Walls of Jericho'. Another Sonic (from Sonic CD) arrives just in time to stop Classic Sonic's berserk rampage. He takes them to Miracle Planet to teach them about responsible time travel. Classic Sonic walks into a trap set by an insane doppelgänger who he finds trapped in the Bad Future. Spoilers, a few cameos, AU, kinda dark with lots of angst.