It's recognized as Bioshock's predecessor. Ken Levine worked on System Shock 2 years before he made Bioshock.
System Shock is about a hacker who hacked a space station but was caught. He had the choice to hack the AI to the Station, SHODAN, or go to jail. The hacker chose the former and got rewarded with cybernetics and was put to sleep on the station. Meanwhile, SHODAN believed it was a god and transformed the crew of the space station into cyborgs and monsters. You start playing the hacker after he wakes up from his sleep and have to stop SHODAN and save the Earth. Here's the intro: