King Koopa plans to capture Prince Hugo the Huge the ruler of Giant Land and turns Cheatsy, Big Mouth, Bully and Kooky into giants to do the job. It's up to Mario and Luigi to save the day.
The Koopa King plans to give Kootie Pie what he really wants for his birthday, America.
Mario gets mistaken for a mummy's missing son, whose sarcophagus was stolen by Hip and Hop.
Kootie Pie and Cheatsy try to steal oil from the Sultan of Desert Land, but Mario and Luigi happen to be in the neighborhood after getting called in to fix the Sultan's plumbing.
It's campaigning time when the Princess and King Koopa compete in an election that will decide the ruler of the Mushroom Kingdom.
In a surprising move, King Koopa and his kids leave the Mushroom Kingdom. When Mario and the Princess check out the supposedly empty Castle Koopa, they discover it's still just as dangerous and that Koopa lied so he could attempt a take over.
The Mario Brothers are having a hard time keeping the kingdom stable while Toad and the Princess have fun in the sun in Hawaii.
King Koopa and Kooky are going to travel back in time to prevent the Mario Brothers from ever arriving in the Mushroom Kingdom. The Mario Brothers and Toad sneak on board the Doomship to stop them, but the time travel reverts them all into babies.
Fed up with their dad, Kootie Pie and Big Mouth run away to Hollywood, where they use their magic wands to transform a monster robot into a real one.
After Toad thinks he lost one million gold coins meant for an orphanage, he enters his cousins into a tag team wrestling match to win a huge coin prize. However, King Koopa and Cheatsy enter the Sledge Brothers as well and, for them, cheating is an option.
After an argument, Luigi walks out into a rainstorm. Mario tries to find him, but he is captured by King Koopa and Kooky. It's up to Luigi to rescue his brother.
As King Koopa plots to rob Pipe Land, he brings the Mario brother's hero, Mighty Plumber, into the kingdom to distract them.
Toad's mishandling of a magic wand belonging to the Wizard King of the West causes it to be taken by the Koopas.
The Mario brothers accidentally emerge from a warp into a Brooklyn home. The parents mistake them for babysitters for their son, Junior, who somehow manages to enter the Mushroom Kingdom and along with Cheatsy, Kooky and Bully cause trouble for Mario and Luigi.
The Princess hopes the Doom Dancer Music Box, which can create an endless dance spell, will put an end to the Koopas, but Mario and the gang's attempt to get it leads to it falling into King Koopa's claws.
King Koopa kidnaps a band named Milli Vanilli so they can play for Kootie Pie.
A family inadvertently arrives from the real world in the Mushroom Kingdom. Everyone, from the Mushroom citizens to King Koopa himself, then hears rumors of invading aliens.
Mario and his frog suit gets turned into cement when he and the others defend the underwater city, Mertropolis, from King Koopa. Then Mertropolis' princess, Holly Mackerel, saves Mario from drowning and falls in love with him.
The Koopas bust Crimewave Clyde out of prison and take him to the Mushroom Kingdom, where Clyde tries to teach the Koopa Kids about stealing. But the Mario Brothers just seem to keep ruining their efforts.
Hip and Hop steal a wand from King Windbag of Ice World. They turn the King and then Luigi into dogs, who have to pursue the twins through Miami to get the wand back and return to normal.
Mario and Luigi rescue Emperor Ed of Sky World from King Koopa, but they get captured. So it's up to Toad and the Princess to get on the Doomship and save the plumbers so they can handle Koopa's Raiser-Upper device.
King Koopa schemes for his Koopalings to take over the seven continents of Earth. Only the Princess, who was inadvertently brought aboard the Doomship, can stop them.
Kooky and Cheatsy create a scheme to divide the Mushroom people by painting them in different colors.
When the Koopalings are forced to dispose of their garbage, they have it dropped on the Mushroom Kingdom and later Brooklyn.
Koopa gets another present for Kootie Pie - this time he plans to use his Doom Sub to chase everyone out of Venice, Italy then warp the entire city to Dark Land so Kootie Pie can have her own water park. The Mario Bros. are approached in Desert Land by an Italian gondolier and since Mario has a passion for the country of Italy, they couldn't resist. Armed with Frog Suits, can they stop Koopa in time?
Kooky has developed a pendant for King Koopa that will grant him the powers of the Mario brothers, but it can only be used in the real world. Koopa uses that to his advantage and lures his unsuspecting enemies into the real world using Luigi as bait. But the Princess manages to contact Toad, who races to get as many power ups to the Mario brothers in time.
