IT's a Peacful day in the mushhroom kingdom. Mario Luigi and PEach are talking about what they should since they are so bored... Then after a couple of falshes of light they decied to head outside. The whole senery has changed and the castle is farther than normal. Mario Luigi and PEach go check out the castle.
Meanwhile IN the castle Sonic Amy Tails Kncukles and Shadow are batling Eggman's new toy Metal Shadow. This thing owns Shadow and Sonic. Shadow about to use choas blast When Mario Luigi and Peach drop in. they make introductions and Mario finishes off Metal Shadow but Eggman has escaped.
At Mario's hosue they make another intro under better conditions. Sonic states that he and hisfriend were looking for an emerald when they were battling Eggman. Mario and Sonic explain to each other where they are from and the group (expect for Shadow) Quickly become friends. Peach Explains that the seven golden coins seems like an equal to the Chaos emeralds. She explains that Mario had to use the coins last when Mario had to face Zario an inukown person looking and talking like Mario. The battle had resulted in a tie and Zario left a waring that they'd meet again.
Eggman in the Death Egg has been scanning the world and his gess that there worlds have merged sends Metal Sonic with Neo, Omega MKII, Gmerl, and Metal Kncukles to gather speicmes from the mushroom kingdom.
Soon later Eggman steals the Master emerald and declares WAR on the mushroom kingdom. Bowser won't stand for this so along with the help of Mario Luigi Peach Sonic Shadow Knuckles Amy and Tails they fight war with Eggman in hopes to stop him from ruling the world.
This is the story of how the group first met and how most of the things are in the series that are being made. SO you get to see How Metal Sonic betrayed Eggman. How Bowser Jr. Joins the side of Good. And Learn Zario.
The guy with the blue shirt and red overalls is Zario.
That's not going to end well...