The game of the same name has your character, JC Denton coming from nowhere and changing the world drastically in a matter of days.
The name of arguably the greatest game ever created. Within the game 'Deus Ex' refers to the AI Helios, who having knowledge of all available information to mankind and control over every single communication on the globe is like a God, and JC Denton ('JC' debated to stand for 'Jesus Christ'), a christ-like figure who, on the box art looks to the sky as light shines down upon him against the darkness of the dystopian city behind, and who eventually manages to change the world's entire social order at the end of the game.
Tells the story of JC Denton, a technology-augmented government agent who works for an agency called UNATCO, and discovers a hidden conspiracy involving members of the highest levels of government. How you play the game is totally up to you. You can do anything, go (almost) anywhere, and talk to (almost) everyone. The voice work is exceptional, the graphics are great, even years after it's release, and the plot is engrossing. This is definitely a game you should pick up.