The Subspace Emissary (Japanese: 亜空の使者 The Subspace Emissary) is a single-player game that is contained within Super Smash Bros. Brawl. It is a side-scrolling action game with a storyline that is said to emphasize character development. Most of the playable characters are protagonists, including Pikachu, Pokémon Trainer and Lucario. Jigglypuff is also playable, but only after completing The Subspace Emissary and has no role in the storyline.
The characters form teams based on the developments of the story. All hidden characters can be unlocked by simply playing through The Subspace Emissary. A second player can join in at any time, though the camera will focus on player one. Like Classic Mode and All-Star mode, the difficulty level can be changed, but unlike those modes, the difficulty level can be altered after the challenge has begun.
In order to obtain trophies of the enemies in this game, the player must throw a Trophy Stand at them. This acts just like a Poké Ball as it 'captures' the opponent when they are at low health. It also works against bosses, such as Rayquaza.
|Spoiler warning: this article may contain major plot or ending details.|
Led by a being known as the Ancient Minister, the Subspace Army's plan is to cut apart the world and carry it into Subspace. This is achieved by two R.O.B.s detonating a Subspace Bomb and the minions known as Primids, which are created from Shadow Bugs from Mr. Game & Watch, attacking anyone who resists. Now everyone must team up to stop this threat. After finding the Ancient Minister, who turns out to be a R.O.B. in disguise, all the Subspace Bombs in the factory detonate, creating a portal into Subspace from which Ganondorf and Bowser emerge on a giant battleship. The characters of Super Smash Bros. Brawl team up and enter Subspace, where they see Master Hand chained by what appear to be chains made of light. Master Hand crashes to the ground just as a mysterious being known as Tabuu emerges. Tabuu attacks with his wings, turning all the characters into trophies. Kirby awakens due to the effects of the badge he earlier spotted lying on the ground, dropped by King Dedede. He then proceeds to pick up the trophies of other characters. The player then goes through the Great Maze, a mashed up version of the real world that Tabuu has made in Subspace. When the player finds all the characters and fight their Subspace versions, the door to Tabuu is unlocked. Once again, the characters confront Tabuu. He is about to turn them into trophies with his wings again, when Sonic shows up, tearing through Tabuu's wings, rendering them useless. He is also unlocked for use against Tabuu. Once the player defeats Tabuu, the credits roll and afterwards Boss Battles can be unlocked; provided that Classic mode has been beaten as well.
Separated from Donkey Kong, Diddy Kong sees an Arwing get shot down by a blast from a nearby lake. Upon reaching the lake, Rayquaza emerges from the water and captures Diddy Kong, but Fox jumps out of the ship and makes a dramatic rescue. Rayquaza then attacks Fox with a ball of energy, but Fox reflects it back at Rayquaza. Fox and Diddy Kong then fight Rayquaza.
Along with the other bosses in the game, Rayquaza is fought again in the final stage, The Great Maze. Upon completing The Subspace Emissary, Rayquaza can then be challenged in the Boss Battle mode, alongside the other bosses.
In battle, Rayquaza can use a variety of attacks, including Thunder, Dig, Fly, Tail Whip, ExtremeSpeed, and Dragon Pulse.
While searching for her stolen Power Suit in the research facility, Zero Suit Samus discovers Pikachu, whose electricity is being harnessed for the facility's power in a capsule-like machine. Seeing the pain it causes to Pikachu, Samus uses her Paralyzer Whip to free it, sounding an alarm. Pikachu and Samus travel together throughout the facility and The Subspace Bomb Factory.
Lucas bumps into the Pokémon Trainer at The Ruined Zoo. They decide to team up to help rescue Ness from Wario and help Pokémon Trainer capture Ivysaur and Charizard. The two travel together throughout most of the game.
At the top of a snowy mountain, Meta Knight and the Ice Climbers encounter a meditating Lucario. After a fight that unlocks Lucario, he helps Meta Knight in his mission to recover his stolen battleship Halberd from a horde of Mr. Game & Watches.
After beating the Subspace Emissary, the player can return to the swamp and locate a door that did not exist before. Upon entering the door, a cinematic shows Jigglypuff singing at Pokémon Stadium 2. The player then fights Jigglypuff. If the player succeeds in its defeat, Jigglypuff joins the party. Other than this, Jigglypuff does not have a significant role in the story.