Taboo


 * SPOILERS* Taboo is the final boss in the Subspace Emissary. He was the one who was controlling the Master Hand, who in turn was controlling the Ancient Minister. Taboo is a human-shaped apparition who flies around the stage quickly and performs a variety of attacks. Before the fight you pick 4 characters to play as in the battle. You can only control one at a time in the fight though (2 in co-op). Taboo's stage is much like Final Destination, but different colors and backgrounds.