Ten years after Mario's very first adventure in Super Mario Brothers Peach is kidnapped by Bowser. Again. Bowser plans to marry Peach, whether she wants to or not. Mario, after a failed attempt at saving her, meets Cappy, a magical hat, in the village of Bonneton. After going to several kingdoms, Mario and Cappy almost reach Bowser's kingdom, only for Bowser to outwit them by turning loose a magical dragon to attack them. A dragon which uses its fire at exactly the same time as an alicorn named Twilight Sparkle uses a teleporting spell. The Odyssey ends up getting sucked through a wormhole, and crash lands in Equestria, where Mario and Cappy try to make friends with the six main ponies and the other ponies. At the same time, they know the clock is ticking, and it's only a matter of time before Bower and Peach weds, and every kingdom falls under Bowser's rule. It's up to Mario, Cappy, and the six ponies to stop him, or the world they know will be demolished.