Mecha Mario is built by Bowser to get rid of Mario, but he goes haywire and causes chaos in Ice Land. He attempts to steal Princess Peach from his creator, and is not on either Mario or Bowser's side.
A week after Mecha Mario is shut down, he is rebuilt as Mecha Mario MKII to work for Dry Bowser.
Mecha Mario and Mecha Luigi appear as the main antagonists in the game. They were built by Professor Elvin Gadd when he had come to the realisation that Mario and Luigi had begun to show the signs of wear and tear. They were designed to fight like the Mario brothers (if not better) in their prime, however their initial failure to adapt to different enemies and obstacles proved to be an issue, so he added an adaptability program and improved upon it every time they failed. However, they had eventually come to the conclusion that the only way to ensure lasting peace within the Mushroom Kingdom was to eliminate Bowser permanently. They wiped out the Koopalings and left him to die (and he would have too, had Kamek not come to his rescue). When the Professor tried to shut them down from afar, they adapted to the shutdown and modified their core programming, going rogue.
Of the two, Mecha Mario is stronger and more resilient to damage. He is also the second most intelligent of all the mechs, bested only by Mecha Kamek's intelligence.
Mecha Mario is one of the bosses that Mario and Co. have to deafet. He is the second and main boss of the first board Mario Land along with Shadow Mario. He is fast and will shoot Bullet Bills,Fire balls, and will even shoot a stream of fire. The player has has to throw fireballs at him to damage him.
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