In Bowser's Castle in the Mushroom Kingdom. Mario and Luigi are fighting Bowser to save Princess Peach. (for the ninth time.) Before they beat Bowser, a Draconequus appeared out a flash of smoke.
The Draconequus spoke " I'm Discord and I'm here to invite you to a magical land of Equestria." Before anybody said/did anything Discord opened a wormhole and it suck everyone into it.
Meanwhile in Ponyville, Twilight was reading a book to Spike. When all of a sudden a flash a light filled the room and a pare of humans was unconscious on the floor. One was wearing blue overalls, a red shirt, and a red hat with a "M" on it and the other one was wearing blue overalls, a green shirt, and a green hat with a "L" on it.
Mario was the first to wake up and noted that he was in a strange bedroom. Then he woke up Luigi to ask him where they are. Before Luigi said anything a purple unicorn mare walked in to the room.
It spoke "Hi Luigi its been a while and who is this man in red Luigi?" Luigi introduced Mario to Twilight and explained how he meet her to Mario.
Then Spike run to Twilight and gave a scroll to her. Twilight read the letter aloud:
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Dear my faithful student Twilight,
Discord got loose again and this time he team up with a monster named Bowser. I would like you to get your friends and meet me at the castle.
your faithful teacher and co-ruler
Princess Celestia
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Mario told Twilight who Bowser was and that he and Luigi can help.
So Twilight, Mario, and Luigi went outside to find Rainbow Dash, Fluttershy, Applejack, Rarity, and Pinky Pie.