Who was the first Mario villain?

Who was the first Mario villain? Bowser: Bowser is the King of Koopas, a turtle-like monster species, who was first seen in Super Mario Bros. He kidnaps Princess Peach many times, and is beaten by Mario.

Bowser: Bowser is the King of Koopas, a turtle-like monster species, who was first seen in Super Mario Bros. He kidnaps Princess Peach many times, and is beaten by Mario.
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