Super Smash Bros.
Brawl is a fighting game that features a variety of characters from different Nintendo franchises.
The Subspace Emissary is the game's story mode, which features a plot that involves these characters teaming up to defeat a common enemy and save the world from being consumed by a mysterious substance known as "Subspace." The story is told through a series of cutscenes and battles, and players can choose which characters they want to control as they progress through the story.
The Subspace Emissary also includes a variety of side-scrolling levels that involve platforming and defeating enemies, in addition to the traditional fighting gameplay.