If you want to fully enjoy Dead Space, you need to experince the  entire package. EA has created a Graphic Novel and an animated prequel to Dead Space. The anime is called Dead Space Downfall, and the graphic novel can be found on PSN and XBLA. This strtegy by EA works really well for the game, as one is more involved in the story, which further enhances the game. Here is a brief about the game :

Set in the 26th century, Dead Space revolves around Isaac Clarke, a space engineer who works for the Concordance Extraction Corporation (C.E.C.), a company that operates giant mining ships throughout the galaxy. When the C.E.C. receives a distress call from the USG Ishimura (a “Planet Cracker”-class ship that mines continent-sized pieces of a planet’s crust in order to extract valuable ore), Isaac and four other C.E.C. employees set out on the USG Kellion to rendezvous with the Ishimura in orbit above Aegis 7. Isaac is first shown watching a video from his girlfriend Nicole, who is a member of the Ishimura crew. Their assumption is that a mechanical failure is the only problem. Whilst attempting to dock with the Ishimura, the Kellion crashes and is badly damaged.

Whilst investigating the Ishimura, looking for a way to repair the Kellion, Isaac and the rest of the crew are separated when they are unexpectedly attacked by a Necromorph. The security members and pilot of the Kellion are quickly killed off, leaving only Zach Hammond, Kendra Daniels and Isaac. It soon becomes clear that most, if not all, of the Ishimura’s crew are dead, or have been converted into Necromorphs. The Kellion is then completely destroyed and Hammond, Kendra and Isaac begin looking for alternative escape methods. A large amount of the game then involves Isaac attempting to find ways to escape whilst under constant attack from the Necromorphs. Isaac also has numerous encounters with Dr. Challius Mercer, a scientist aboard the Ishimura who is completely insane, and talks about the Church of Unitology, and their desire to bring The Marker back to earth…. for more click here to read the Wiki.