A series of 2 first-person futuristic horror shooters. In both games, the player is given the role of, essentially, a lone survivor on a malfunctioning spacecraft. The player is guided through the vessel, attempting to accomplish missions and tasks transmitted to him via other survivors (usually via remote messages - the player never meets the survivors) and the AI system that's in control of the spacecraft. The player increases in skill throughout the games through gaining cybernetic rewards and implants, whilst always needing to remain on the lookout for new guns and ammo to battle the hoards of robots and mutants that seem to infest the ship. Interestingly, the recurring character in the series is the AI antagonist SHODAN, not the player character.