Mizzo appears as an enemy in the Subspace Emmisary mode in Brawl. It can only be found in a display room in the Halberd along with other Subspace enemies, and can be seen attached to two blue tentacles and attemps to swim around.
Trophy description
"Within the battleship Halberd, there's a display room where a number of enemies are on display. On the way there, a number of different enemies obstruct your path, but one enemy appears only in this display room. That enemy is Mizzo. With a round body sprouting arms and legs, its appearance and swimming motions make for an extremely bizarre being."
Game: Super Smash Brothers Brawl (2008)
