Adventure Mode: The Subspace Emissary

Adventure Mode: The Subspace Emissary is a mode in Super Smash Bros. Brawl, similar in concept to SSBM ' s Adventure Mode. It was hinted at on July 20th with the "This world..." update, but fully confirmed and announced on August 3rd on the Smash Bros. Dojo!! official site.

Features
According to the main site, it will focus more on side-scrolling action stages, rather than battles. It will also have a storyline, a feature that previous single-player modes lack, and will "emphasize character development". Several new enemies appear in the mode, including the shadowy creatures from "This world..." and updated designs from Kid Icarus (including a shot of what may be Palutena, the Goddess of Light from said game).

Video Clip
The update also includes a 40-second video clip, which shows several things, including:
 * Meta Knight's ship (the Halberd)) dropping shadowy spores that coalesce and form into the shadowy creatures seen in This World.
 * Peach and Zelda rushing to the side of Mario and Kirby. This confirms Peach's appearance in Brawl.