Giant Bowser is not to be confused with Giga Bowser.

Giant Bowser is a minor boss who appears in Super Smash Bros. Melee and Super Smash Bros. Brawl.

In Super Smash Bros. Melee

In Melee, Giant Bowser appears at the end of Adventure Mode, where he is fought at Final Destination. He may or may not be the last boss. If he is regular colored (his green alternate costume), he is the last boss, only if the difficulty is on Very Easy or Easy. If he is using his black costume, the last boss is Giga Bowser, only if the difficulty is on Normal or higher and under 18 minutes (if the time limit is not exceeded and the player does not continue).

Extra appearances include an immensely large version (over twice as large as the normal Super Mushroom Bowser) that appears in Event 25: Gargantuans against the computer controlled, similarly-sized, DK, plus a super tiny Mario and Peach. He reappears in Event 42: Trouble King 2 for Luigi to KO.

In Super Smash Bros. Brawl

Giant rumble

Giant Charizard, Giant Bowser, and Giant DK ravage New Pork City.

Giant Bowser returns with Giant DK in Brawl, and they are joined by a new giant enemy: Giant Charizard. In Event 27: Three-Beast Carnage, Giant Bowser joins Giant DK and Giant Charizard in attacking New Pork City.