Board Thread:Speculation, Theories, and Rumors./@comment-24252369-20131223195537/@comment-477304-20140103033953

Well, at the end of Sonic Rivals 2, Eggman Nega gets trapped in another dimension that houses a monster called the Ifrit, I don't think that it's impossible that Eggman Nega managed to find his way into the sol dimension from there, as there was portal connecting Sonic's dimension to the Ifrit dimension, there could be other portals.