Giga Bowser

Giga Bowser is a gigantic, enhanced version of Bowser introduced in Melee. He is the secret final boss of Melee's Adventure mode, only appearing if certain conditions are met. He is also one of the fighters in the final match of Melee's Event mode, "The Showdown", with Mewtwo and Ganondorf by his side. Giga Bowser has several abilities that the regular Bowser does not. He is so large that he is immune to grabs and similar grabbing moves. As with Metal Mario, Giga Bowser becomes playable for short periods of time in the following game, Super Smash Bros. Brawl, when Bowser performs his Final Smash attack. Bowser transforms into Giga Bowser, and is near invincible, if not fully invincible, until the effect of the Final Smash wears off.