In Super Mario Bros., the evil King Bowser invades the Mushroom Kingdom, using his magic to turn the native mushroom people into bricks and stones. Bowser kidnaps Princess Peach, the only person with the power to reverse the curse, and holds her captive in one of his castles. The game follows two plumber brothers, Mario and Luigi, on a quest to rescue the princess, defeat Bowser and his army, and restore peace to the kingdom