A base story was provided to the online writers. It occurred a few years after Mother Brain's defeat (presumably the recent Super Metroid) and involved an invasion by the "True Chozo", a branch of the species that split off and broke off contact with sentient species, in the Messina star system. This invasion was predicted by the Overdog, who helped organize a rebellion. The writers (responsible for over 6,000 posts throughout the story) were asked to create their own "True Chozo" character and write stories within the established framework, with writers loaning characters to each other and expanding on plot points occasionally provided by Nintendo. The character had to be from one of five guilds: bounty hunters, engineers, merchants, marshals, and trogs.