Yeah, basically just to confirm what's been said but just confirming something else here- Episode Metal goes straight inbetween Ep I & II, as it ends with Sonic & Tails flying off on the tornado. They have left behind the rocket that Sonic used to get the to the E.G.G Station. Sonic 4 Episode I ends with Sonic in Splash Hill so Sonic obviously met up with Tails there and camped out a bit- they then flew off on a long journey through the desert linking Episode I to Episode II. Metal chases them and ends up finding them in White Park again. And then it goes from there.
Indigo Dude has the game order spot on.
This also confirms why Dr Robotnik decided to build other Metal Sonic versions between Sonic CD & Sonic 4

I am loving SEGA right now.
By the way guys, I've seen a few of you a bit disappointed that Metal Sonic has been depicted in the bad future of Stardust Speedway- the only explanation there is is that after Sonic saved Little Planet and the future became good again, because this was still set in the present of the Little Planet, it's still bad look despite Eggman's presence no longer having a hold over the planet. When playing Sonic CD, you
travel to the good future if you enter there yourself through a signpost or Sonic does behind the scenes between each level after collecting the Time Stones/destroying capsules automatically. it's still the future, so the present is still in whatever mess it was, but the evil influence is no longer there years afterward.
Where Metal Sonic lays is only a year or so after Sonic CD when the Little Planet returns over Never Lake, so the future hasn't yet set in
Also, it takes its graphics from the Generations version of the Metal Sonic race- Sonic travelled back in time there himself to replay fighting Metal, so it seems the event is also related there too, seeing as he's now lying in the middle of the road. It seems this time travel in Generations has also affected the outcome of the battle, or maybe I'm overthinking this. Remember at the end of Generations they turn Super and the Super Sonic music for Sonic 4 plays? Then Classic Sonic goes back to his time?

Yeah...
Time travel is confusing.
The only problem with leaving it just with Sonic CD and not Generations is that in Sonic CD you HAVE to get the Time Stones BEFORE the end of Stardust Speedway in CD, and this generates the good future of the Metal Sonic boss. The only reason this is plausible is if Generations fucked with the time travel, like when Trunks goes back to the past and changed it in DBZ.
Eh. I'll leave that for you to digest.
This post has been edited by SpeedStarTMQ: 19 May 2012 - 01:00 PM