Board Thread:Speculation, Theories, and Rumors/@comment-25256883-20160220123602/@comment-24810590-20160406134948

Ethan7896 wrote: Mario, Sonic, Luigi, Tails, Knuckles, Yoshi, Silver, Shadow, Princess Peach and Elise, Amy, The Wisps, Bowser, almost everyone in the Mario and Sonic Universe Unfortunately, I don't think this would be the outcome of the movie. (I know, it's sad.)

If it were to feature Mario characters, it would be the "2018 Sonic and Mario Movie", and not the "Sonic Movie". Although, it still could include Mario characters as cameos. Very possible.

(I really would like a Mario and Sonic crossover in the form of a movie, though! It would be very amusing! Also, a Spongebob and Sonic crossover.)