Subspace (Super Smash Bros. Brawl)

Midair Stadium being swallowed by Subspace.

Subspace is an entity found in the Subspace Emissary in Super Smash Bros. Brawl. In The Subspace Emissary, the Subspace Army uses Subspace Bombs to drag anyone and anywhere into Subspace. Each time a bomb detonates, a certain part of the World of Trophies is destroyed and sucked into a place known as Subspace. The first area ever destroyed was Midair Stadium. Throughout the game, the Subspace Army kept destroying many other parts of the world. The explosion of the bombs can be compared to Super Paper Mario's Void; however, Subspace explosions do not kill characters sucked into it and instead just warp them to Subspace, a world of darkness.

All the characters in the game end up entering Subspace, when they follow Bowser and Ganondorf (in Wario's case, he ended up here through a Subspace bomb detonated at The Ruins earlier in the game). However, once there, they were attacked by Tabuu. Luigi, King Dedede, Ness (and later Kirby) then come to the rescue and revive all the trophies. Tabuu forces all the characters to go through a conglomerate of areas from the Smash Bros. world. After a long journey through the Great Maze, they all reach the Final Destination (which appears to be located in Subspace as well) and fight Tabuu. Sonic the Hedgehog joins them in the fight. They then defeat Tabuu, and all is well.