Synopsis
The story opens in the Mushroom Kingdom with Mario and Luigi entering the Mushroom Castle basement, where Mario gets right to work, singing as he does so. Just then, gigantic pipes start popping up in the basement and in the courtyard. Various enemies from Super Mario World pop out of the pipes and attack the guards, but the Mario Bros. fight back. Bowser comes out of the largest of the pipes in his Koopa Clown Car and proposes marriage to Princess Peach. He then leaves Peach one week to decide on his proposal, but Peach rallies her troops and takes off after him.
Mario and Luigi chase after Peach and soon find a large egg, which cracks open to reveal a grateful Yoshi. Yoshi takes them to the nearby Yoshi Village, where they meet Friendly Floyd and discover Yoshi's backstory. Toad arrives to inform the pair that Peach has been captured.
In a nearby tower surrounded by a lake, the Koopalings are contacted by Bowser, who informs them of his decision to make Peach their stepmother and then orders the Koopalings to make sure she doesn't escape. She soon does, using a cape she finds that gives her the ability to fly.
On the other side of the lake, the Mario Bros., Toad, and Yoshi are trying to figure out a way to get to the tower. Mario rescues Luigi from a Bullet Bill which takes Mario across the lake. The Princess lands unconscious by Luigi, and Mario lands dazed in the clutches of the Koopalings.
Luigi poses as Peach, using a mask, and is brought to Bowser. Peach wakes up, now dressed as Luigi, and is also determined to rescue Mario. Luigi offers to order the Koopalings a pizza, and then calls up Yoshi and Toad, who show up dressed as pizza delivery boys. But out of the boxes come Peach and Floyd, bearing a pack of bombs that Floyd had with him. Luigi runs off to rescue his brother. Eventually Peach's bomb is accidentally lit, blowing up the tower and sending all the good guys flying back over to the other side of the moat.
Floyd parts ways with the heroes, who feel victorious due to Bowser's apparent defeat. Mario realises there's no way to reach the entry pipe in the sky. Toad takes Peach's cape to fly up to the pipe and send for a rescue party. Shortly afterward, some odd-looking Mushroomites show up with a rope ladder. The leader cuts the portion of the ladder with the Mario Brothers, and it is revealed that Bowser and the Koopas have taken control of the Mushroom Kingdom.
The Mario Bros. and Yoshi give chase after the Koopas' saucer, but Bowser responds by sending down Koopa Paratroopas to attack them. Mario fights back and Yoshi eats each Paratroopa until finally he swallows a Blue Koopa Shell and grows wings. The trio eventually crash-land in front of a Ghost House. Luigi dashes into the house, smelling cheese, and Mario follows when a metal door comes down, leaving Yoshi locked out.
Mario and Luigi are surrounded by Boos, eventually meeting Big Boo. They escape through a door and when the Boos follow they find Mario dressed as a psychiatrist, and Luigi as a nurse. Mario consults the Big Boo, who confesses that his fear of humans stems from bad childhood experiences. Now feeling better, the Big Boo and his buddies let Mario and Luigi out of the house and tell them how to get to Bowser's castle.
The Mario Bros. and Yoshi make it to the Koopa-conquered Mushroom Kingdom and find that practically every enemy character from the classic Mario games are gathering for Bowser's marriage. The trio use available pipes, and Mario gets separated from the other two.
Bowser uses Magikoopa hypnotize the Princess into loving him, but just as the ceremony begins, Mario comes out and attacks Bowser. He is astonished to hear Peach declaring her apparent love for Bowser, but he refuses to let that stop him, and he attempts to carry Peach out while Bowser orders his men to seize him.
Down in the basement, Luigi and Yoshi come upon the captured Yoshis, who are now all trapped in eggs. They get to work setting the Yoshis free. Just when the ceremony gets underway again, Luigi and the Yoshis come stampeding in, trampling all of Bowser's minions. This breaks the spell on Peach, who then proceeds to untie Mario. Bowser tries to hide in his wedding cake, which the Yoshis begin devouring. The Yoshis are freed, and peace returns to the Mushroom Kingdom.
Read more about this topic: Super Mario Adventures