Badass Sci-Fi Horror RPG, scary as heck. Set on a derelict ship with Cyborg Zombies, Corrupted AIs, Ghosts, and an evil mastermind who appears to help...at first. You could play as a Marine with special combat skills, a Navy Hacker, or an ONI agent with Psionic Ability. Fun game, it collects dust until the first week of every September when I play it again.
System Shock 1, I haven't played yet, it's a rare find.http://en.wikipedia.org/wiki/System_Shock_2