User blog comment:Sacorguy79/Wreck-it-Controversy/@comment-4872373-20120714134715/@comment-3199864-20120801153839

That's actually true - both things, in fact. Sonic will have a speaking role (as well as Dr. Eggman having a cameo), and the reason Mario and Luigi could not be used was because of a massive royalty that Disney would have to pay to Nintendo. Sonic is voiced by the same person he is in the games: Roger Craig Smith.