|Full Name||Dark Bowser|
|Current Age||Old as time|
|Date of Birth||Beginning of time|
|Dark Island and Moon god|
|Family and Relations|
|Light Bowser (Brother)|
|Main Weapon(s)||Dark versions of Bowser's attacks|
|Latest Appearance||Super Mario HD/3D|
When the Dark Star was gathering DNA from Bowser's body, Mario and Luigi tried to stop it before it succeeded. The brothers fought hard to defeat it, but apparently, it had already absorbed every piece of DNA that it needed, and it transformed into Dark Bowser, although in a ghost-like state because he was incomplete. The only parts missing were the legs, which it obtained by inhaling Dark Fawful, thus completing his form, and becoming solid in the process. He flees from Bowser, but when Bowser finds him in the secret tower of Peach's Castle, they both execute flame breath attacks that clash with each other, initiating the prologue to the final battle. Bowser overwhelms Dark Bowser and the fight commenced. Bowser overwhelmed his dark form, who gets away. Later, Dark Bowser unleashes a dark hurricane over the Mushroom Kingdom, trapping Broque Monsieur, the Blue Paratroopas and several Toads and Goombas in bubbles. Bowser was the only one who could defeat him, as he was his doppleganger.
After taking enough damage, Dark Bowser fell to the ground; he is was fully healed by ingesting Dark Fawful and grew larger. Bowser attacked his stomach so that he spat up the Dark Star Core and caused Dark Bowser to shrink. Bowser then inhaled Dark Fawful, which Dark Bowser attempted to counteract it with his own inhaling technique. As Bowser pulls Fawful into his belly, the Mario Brothers faught Dark Fawful. After several turns of fighting Dark Fawful, he escaped and return back into Dark Bowser's body, forcing the process to be repeated. Only upon Dark Fawful's defeat did Bowser give his shadowy doppelganger the final blows. Once defeated, Dark Bowser dissolved, leaving only the Dark Star, which rises into the air and explodes, restoring the Mushroom Kingdom to normal.
Dark Bowser is the real final boss of this game. He throws dark meteors from the sky at the player and spits blue lava balls at them. He can pound the platform, causing it to lose balance, as well as warp across the battle.
Dark Bowser does not actually appear in the game, but he is Bowser's tranformation after regular Bowser is defeated by Mario.