Mario and Luigi are enjoying a lazy afternoon at their house when they hear the terrible news: Princess Peach has been kidnapped. The two Mario brothers head straight for Bowser's castle to get her back, but Bowser is just as surprised about Peach's kidnapping as they are. At that moment, a strange top-hatted villain warps in and abducts everyone but Mario. The mysterious villain then forces Peach and Bowser to get married, creating a rift of dark energy that threatens to tear the universe apart. Only Mario can save the day, but he can't do it alone.