Samus and Zelda running from Giga Bowser.
Giga Bowser first made his appearance in Super Smash Bros. Melee as the final boss in Adventure mode. He is available to battle if you get to the final level on Normal or higher in 18 minutes or less. After defeating the regular Bowser, Giga Bowser comes into play.
In Super Smash Bros. Brawl, Giga Bowser is Bowser's Final Smash, allowing the user to control this gargantuan. However, he is only available to control for a short 12 seconds, so try to wreak as much havoc as possible. Also, while he can still receive damage while in this form, he will not flinch from attacks, meaning he can't be knocked off the stage by the opponent. He can also KO himself in this form by jumping into the abyss. Not a good idea,though.
Giga Bowser's moves are all the same as Bowser's,except each have an element tied to them,like the famed battle with him In Super Smash Bros. melee. He cannot use his Grab as Giga Bowser,but his Side B can be used in place of this. on Huge stages, it is more difficult for Giga Bowser to cause mayhem,as his opponents can run. On smaller stages,like Final Destination and Battlefield,is where giga Bowser shines.