Mario is the brave, courageous, very intelligent, kind and extremely popular hero of the Mushroom Kingdom, as well of the Mushroom World. Prior to Super Mario Bros. Z, he landed on Yoshi's Island by dropped down by a Stork by accident and was taken in by the young Elder Yoshi to rescue his brother from Baby Bowser. During a race, he fights and defeats the King of Koopas, Bowser. He meets with Sonic and Shadow, and they team up to find the Chaos Emeralds and prevent the evil antagonist, Mecha Sonic from getting them and destroying the whole Mushroom World. He is partnered with his heroic longtime and faithful best friend Yoshi to help him and Luigi, along with his new Hedgehog friends to find the Chaos Emeralds before Mecha Sonic, after Mecha Sonic badly injured Yoshi.