Ketrick

Ketrick is the supervisor of the reactor core within the power plant.

 Spoiler warning : plot or ending details follow 

In this part of the game, the player is clothed in a radiation-proof acolyte uniform, both for protection within the core and for camoflauge purposes. Ketrick is the first NPC to see through the player's disguise, and will set off the alarm if you talk to him, then attack the player until killed. He also provides a necessary keycard when he dies. Getting past Ketrick is essential for performing your mission of destroying the core, as he is standing in the way of your rocket launcher.