Boom Boom is a recurring boss within Super Mario Bros 3. He helps Bowser and the Koopalings invade the Mushroom World's seven kingdoms. Boom Boom appears in the fortresses of each kingdom, fighting Mario and Luigi to prevent them from going any closer to the Koopalings. However, the Mario Bros. prevail, and his fortresses get destroyed thanks to the magic balls he dropped. After he fails to protect the Koopalings, Boom Boom also appears in many levels in Dark Land; specifically in World 8-Fortress and all the battleships, airships, and tanks - except for the first tank set, which is instead manned by a Boomerang Bro. Due to palette inconsistencies between locations in the original version, he appears dark brown in most places, blue and gray in World 2-Fortress, tan with white details in World 6-Fortress 2, and tan with lighter tan details in vehicle levels, though later versions have him consistently tan.