Mario and Sonic; The Legend of the Star Treasure

Both Nintendo and SEGA characters are in need of saviors. The heart of the Mushroom Kingdom and the Dark Gaia from Mobius have awakened and they need two heroes. And who might those heroes be? None other than Mario and Sonic. Everything should go all right...wrong! Arch-rivals working together doesn't make a good combination. Will the two be able to get along, or will their worlds be destroyed because they wouldn't stop arguing. Find out. And just to let you know, this is going out of chronological order, but this would be before they even met in the Olympic Games, even though inn Sonic Unleashed, Sonic already met Chip and Dark Gaia had already been awaken...just imagine they've never met, okay?