Super Mario Bros. IX (Nintendo Cinematic Universe)

Super Mario Bros. IX is a Japanese anime film.

Summary
Mario's planned proposal to Princess Peach gets ruined when Bowser strikes again.

Plot Elements

 * Bowser and the Broodals, a family of anthropomorphic rabbits serving as his wedding planners, kidnap Princess Peach from the Mushroom Kingdom and take her aboard Bowser's airship, intent on forcibly marrying her.
 * The Mario Bros. attempt to rescue her but are thrown off the ship by Bowser's hat and fall into the neighboring Cap Kingdom.
 * With the Mario Bros. gone, Bowser stomps on Mario's cap and lets it drift into the ship's rear propellers, shredding it to pieces.
 * A piece of the hat is grabbed by Cappy, one of the Cap Kingdom's sentient hat-like creatures called Bonneters; he explains to the Mario Bros. that Bowser also kidnapped his sister, Tiara, to be used as Peach's wedding tiara.
 * Cappy joins the Mario Bros. and takes the shape of Mario's cap, providing him with the ability to throw his cap and temporarily capture other creatures and objects and utilize their abilities. They travel to the nearby Cascade Kingdom, recover an airship called the Odyssey, and begin pursuing Bowser.
 * The Mario Bros. and Cappy explore the various kingdoms to collect Power Moons to fuel the Odyssey and battle the Broodals, who steal items including a dress, a cake, and a bouquet from each kingdom to set up Bowser's wedding. Eventually, they catch up to Bowser in his own kingdom and defeat the Broodals in their Mecha-Broodal for good. However, Bowser subsequently departs for his wedding on the Moon.
 * The Mario Bros. and Cappy fly the Odyssey to the Moon's surface and confront Bowser inside a cathedral there.
 * Mario and Bowser battle in a cavern, which Mario wins. He frees Peach and Tiara, but the cavern begins to collapse.
 * Mario captures an unconscious Bowser and escapes to the surface with Peach and Tiara.
 * After Peach thanks Mario for his help, Bowser regains consciousness and decides to properly propose to Peach, causing Mario to do the same in haste. Overwhelmed, Peach turns down their proposals.
 * Peach, Cappy and Tiara board the Odyssey. The rivals are both broken until Peach tells Mario that it's time to go home. Mario boards the ship just in time, leaving Bowser stranded on the moon.
 * Mario returns to the Mushroom Kingdom, where he discovers Peach has packed her bags and decided to take a vacation to all the kingdoms Mario and Cappy visited, this time out of her own free will. Catching up to her, Mario finally proposes to Peach and she accepts this time; during their wedding (which, by the way, Bowser attends with the Broodals after apparently giving up on Peach), Pauline sings "Jump Up, Super Star!"
 * Mid-Credits Scene: Sometime later, Piranha Plant, a scientist that the Mario Bros. briefly encounter, has developed a way to explore the afterlife. As he tests his machine out, his teammates disintegrate into golden dust particles, leaving him stranded in the afterlife.