So, Eggman Nega comes from the future to turn everything into cards - but Silver The Hedgehog is on the case and follows him back and meets with Sonic The Hedgehog who he met once before in SONIC The Hedgehog 2006. but of course didn't as since the flame of solaris was extinguished none of the events of that game ever occurred; thus nullifying all previous meetings betwixt the pair.
got That? oh and Shadow, Knuckles and Metal have a bit of a race with them as well. Sorry, forgot that bit.