Sonic/Back to the Future

Version 1 (AoStH/SATAM/Underground version)

 * Sonic as Marty McFly
 * Knuckles as Doc Emmett Brown
 * Tails as Einstein
 * Bunnie as Lorraine McFly
 * Uncle Chuck as George McFly
 * Dr. Robotnik as Biff Tannen
 * Scratch, Grounder, and Coconuts as Tanner's Gang
 * Sally as Jennifer Parker
 * and more

Version 2 (Sonic X version)

 * Sonic as Marty McFly
 * Knuckles as Doc Emmett Brown
 * Tails as Einstein
 * Vanilla as Lorraine McFly
 * Vector as George McFly
 * Dr. Eggman as Biff Tannen
 * Amy Rose as Jennifer Parker
 * and more