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Mario's had one primary nemesis since the NES days, and that nemesis is none other than Bowser. Bowser is the King of the Koopas, a race of evil turtles

Bowser - Smash Bros Brawl Guide - IGN

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Bowser - Smash Bros Brawl Guide - IGN

Bowser - Smash Bros Brawl Guide - IGN

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