Subspace (Super Smash Bros. Brawl)

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 eventually enter Subspace, when they follow Bowser and Ganondorf after the destruction of the Subspace Gunship (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 and incapacitated by Tabuu. Fortunately, Luigi, King Dedede, and Ness (and later Kirby) come to the rescue, journeying through Subspace and reviving all the trophies.

When the heroes have regrouped, even recruiting the former villains into the team, Tabuu forces all the characters to go through The Great Maze, a fusion of the areas of the Smash Bros. world previously pulled into Subspace. After a long journey, the group reaches the Final Destination (which appears to be located in Subspace as well) to fight Tabuu. Sonic the Hedgehog joins them in the fight. They then defeat Tabuu, and all is well.

Trivia

 * It is possible that all Subspace areas are connected in someway, as Wario's trophy was in the Subspace in the Ruins area and later appeared in the Subspace where the Isle of the Ancients was. The same applies to Ness, Luigi and King Dedede, as they were in the Subspace where King Dedede's Castle was.