Dead Space D20
Welcome to Dead Space,
The Dead Space D20 is a role playing game using a original D20 system mixed with Call of Cthulhu and is based on the game Dead Space created by EA games. (I did not create Dead Space or take credit for any of the creatures created in game, this is a game created by fans of the game nothing more.)
After that, take a look at your wiki. There is some more helpful info there.