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After being sucked into a drain pipe, Mario and Luigi defend the Mushroom Kingdom from King Koopa.
S1 "Koopenstein"
Mario, Luigi, Toad and Princess Toadstool, after some traveling, arrive in a town in the Swiss Cheese Alps, the villagers of which they plan to rescue from a mad scientist named Dr. Koopenstein, who Mario deduces is King Koopa.
S1 "On Her Majesty's Sewer Service"
Mario and Luigi become spies.
S1 "Mario and Joliet"
In the Land of Romance, Mario, Luigi, Toad and Princess Toadstool are currently trapped in a rapidly crumbling building by several Snifits, half of whom are wearing red.
S1 "Too Hot to Handle"
In Lava Land, Mario, Luigi, Toad and Princess Toadstool use a variety of floating rafts to reach an island named WakiWaki in the middle of the ocean, where Mario, Luigi, Toad and Princess Toadstool are to meet a Fire God.
S1 "The Pied Koopa"
In Pasta Land, King Koopa uses a magical flute to lure all of the local Mushroom children away from the town, and leads them to his nearby castle.
S1 "Do You, Princess Toadstool, Take This Koopa...?"
Princess Toadstool agrees to marry Koopa.
S1 "The Adventures of Sherlock Mario"
In Victoria, Mario and Luigi are riding atop a carriage being pulled by a horse travelling down a street in search of a great detective by the name of Herlock Solmes, with Toad and Princess Toadstool riding in the carriage.