Dead Space is a media franchise created by Glen Schofield, developed by Visceral Games and published by Electronic Arts. The franchise centers on a series of video games of the survival horror and third-person shooter genres, and also includes one motion picture and a comic book series, with more media planned for the future. The series began in 2008 as an eponymous video game aimed at creating, in Schofield's words, "the most terrifying game we could"; the game was a success and spawned a prequel and later a sequel planned for release in 2011.
Each installment in the Dead Space series is a continuation or addition to a continuing storyline which began with the release of the original eponymous game. The game is set in a 25th-century science fiction universe featuring environments, weapons and characters typical of the genre. The series' chronology is not presented in a linear format, with sections of the storyline presented in the form of either prequels or sequels, and in different mediums aside from only video games.
Source: Wikipedia, "Dead Space (series)", available under the CC-BY-SA License.