When the fighters enter Subspace, they are turned into trophies by Tabuu. Luckily, King Dedede, Luigi, and Ness are saved by Dedede's brooches and save most of the characters. At the same time, Kirby, who had previously swallowed one of Dedede's brooches, is awoken. During the level, the player must play as Kirby and save the fighters that Dedede did not. Once completed, a cutscene occurs where Kirby finds Ganondorf's trophy. He studies Ganondorf carefully until Bowser arrives, bashing the trophy angrily, perhaps as vengeance for Ganondorf's backstabbing. While Kirby stares in confusion at this display, King Dedede leaps in from behind and hugs Kirby. Also, if Link and Zelda are saved, then a cutscene will happen where they revive Ganondorf. If Wario is rescued, a cutscene will occur where he knocks down Dedede and races them up the stairs to the Great Maze, with Ganondorf and Wario joining the party if rescued.
- Peach - Head to the first small platform seen.
- Zelda - After Peach, continue to the big platform where mines are on the very right.
- Meta Knight - Continue and the player will see his trophy guarded by two mines.
- Link - In the next room where the player must get down with bomb blocks.
- Yoshi - After Link, break the next bomb block but on the left.
- Lucario - After Yoshi more bomb blocks but on the right.
- R.O.B. - Near the end of the room after two batches of enemies.
- Ice Climbers - After R.O.B. go through the door and stay on the upper platforms, the player will see the trophy trapped.
- Snake - Continue right after Ice Climbers, the player will see a Ticken and the trophy both trapped.
- Wario - At the very end of the stage. He will join the player if they rescue him.
- If Link and Zelda are obtained, then Ganondorf will join the player's party.
- Scope Primid
- Sword Primid
- Fire Primid
- The only music in this stage is Step: Subspace Ver. 3.
- R.O.B. is the only trophy that is separate from the Fighters (Samus, Pikachu, Donkey Kong, Diddy Kong, Olimar, & Captain Falcon) at the Subspace Bomb Factory (Part II).