User blog comment:Seketwut/What should Sonic have a crossover with?/@comment-5316358-20120721214113

Two Mario and Sonic crossovers that's not olympic based, one where Sonic and other are in Mario's world. Then a sequel where Mario and others is in Sonic's world. Both enemies from both series (Gooma, Koopa, Egg Pawn, Caterkiller, etc.) appear, powerups of both series (Fire Flower, Sonic's Shoes) but Eggman is the boss of the first game and Bowser is the boss of the sequel. Both games will have the Koopalings/Bowser Jr. as the boss battles for worlds.