Giga Bowser

Giga Bowser is the final boss of Adventure mode in Super Smash Bros. Melee. He is a gargantuan version of Bowser and could only be fought after completing Adventure mode in normal or higher dificult within 18 minutes and without using any continues. Additionally, he was a villain in the final event match, with Mewtwo and Ganondorf (of the Pokémon and The Legend of Zelda series, respectively) fighting alongside him.

In addition to being much larger than the original king of the koopas, Giga Bowser looks far more evil, with a smaller head, spikier, scaled shell, surprisingly more muscular physique, and a new curve to his lengthened horns. Giga Bowser is truly an intimidating sight to behold, and rightfully so; he is far more difficult than his smaller counterpart.

Giga Bowser possessed the same moveset as Bowser, but several moves had an 'elemental' effect; for example, his A+Down move could freeze opponents, and his forward Smash was explosive.

Giga Bowser is officially considered to be a Super Smash Bros. character, not a Mario character. In the game, his icon is not a mushroom (as is the case with Mario characters), but a SSB symbol (as is the case with SSB characters). Therefore, it is unlikely that he will be appearing in any games other than entries in the SSB franchise.

Giga Bowser will return in Super Smash Bros. Brawl as Bowser's Final Smash. The attacks name is Giga Bowser Transformation. He will be invincible this time around, and he will only be playable for a very short while.

Trophy Information
''An even more imposing figure than the original King of the Koopas. Giga Bowser is roughly twice the size of his scaly, fire-breathing, spike-studded Super Smash Bros. Melee counterpart. Predictably, this monstrous creature's offensive and defensive powers are a grade higher than those of regular Bowser. Good luck defeating this colossus!''

Trivia
Giga Bowser was playable in Super Smash Bros. Melee using an Action Replay device.