Super Mario Momotarō
On a floating island in space, Ojīsan and Obāsan, two elderly Hammer Brothers, live in peaceful happiness with their beloved daughter, Princess Peach. However, word of her beauty reaches the evil King Koopa, who had been plundering treasures from all across space. He arrives with his Koopalings (minus Lemmy) and upon seeing Peach, decides that her beauty makes her the perfect bride for himself and orders the Koopalings to snatch her. Ojīsan and Obāsan beg King Koopa to not take Peach, offering him anything in return, but he shrugs them off and leaves with their protesting daughter.
Peach rejects Koopa's proposal and is thrown in a cold dungeon in his castle on Ogre Island, while the evil king and the Koopalings continue their destructive raids, amassing a huge amount of treasures, to Koopa's pleasure. Meanwhile, Ojīsan and Obāsan are consumed with grief and unable to concentrate on anything else, spend their days missing Peach and worrying about her safety.
Then one day, a shooting star lands at their feet, and when the light abates, it is revealed to be a giant peach, which then splits open and out pops a healthy, mustachioed baby boy. Amazed to be blessed with the child, Ojīsan and Obāsan name him Mario and raise him, astonished by his rapid growth from a baby into a brave young man. While they are proud of him, they still miss Peach and after they accidentally mention her in front of Mario, he asks to be told about what happened to her, which is shown in flashback. He immediately resolves to go and rescue his sister, but while Ojīsan tries to talk him out of the dangerous quest, Mario is confident that he can save her, and tells him and Obāsan not to worry.
Back in Koopa's castle, he once again beseeches Princess Peach to marry him, but she merely misses Ojīsan and Obāsan, and wishes for help. And help is on its way, as Mario ties a bandana with a Peach emblem around his cap and prepares to head out. Obāsan gives him a lunchbox of his favorite food and Ojīsan gives him a gun, saying it is a treasured family heirloom that should come in handy against Koopa. Mario thanks them and bids them farewell, cheerfully singing to himself as he walks through the countryside.
Soon into his journey, a starving Para-Beetle crashes into his head, too weak to fly properly. Mario shares his mushroom lunch with her, and she joins his cause as thanks. The two then come across a Boomerang Brother who had fallen on his back, and when Mario helps him up, he also joins them. Finally, a Spike who had heard about Mario's quest from Ojīsan runs up and asks to join them, as his homeland had been destroyed by Koopa, and he wants to help them defeat the tyrant. The three soon set sail on a rocket-powered airship, a peach emblazoned on its sail.
Meanwhile, Koopa revels over his glittering treasure, commenting that all he needs now is for Peach to marry him. But when he goes down to ask her to answer his proposal once more, Roy alerts him that a suspicious ship is approaching. As soon as they land, the Koopalings attack, on Koopa's orders, soon joined by the king himself. While Mario's friends battle the Koopalings, he goes after their leader, nimbly dodging Koopa's spiked mace until finally defeating him with help from the Para-Beetle and Boomerang Bro and a well-aimed stomp to the face.
Now tied up, and with the Koopalings similarly subdued, Koopa begs Mario not to shoot him and eventually agrees to stop plundering the lands and allow Mario and his friends to return everything he stole. Peach thanks Mario for rescuing him, and they and Mario's three followers depart on the treasure-laden airship, eventually returning home to Ojīsan and Obāsan.
- This is one of only a few instances of Mario wielding a type of gun or any other weapon, although he is never actually shown using it, merely pointing it and later using it for intimidation.
- Lemmy Koopa is the only Koopaling that does not appear in this film.