Kane is forced to combat his former commander, Lieutenant Voss, who has been fully stroggified into a powerful mechanized monster. (Voss nevertheless retains his own consciousness long enough to warn Kane). After defeating this threat, Kane and the remaining marines finally make it back to the Hannibal. The commanders realize that Kane's Strogg physiology has opened up new possibilities for defeating the Strogg, as he can be used to infiltrate locations previously impenetrable to human forces. The new plan is to directly target the Strogg Nexus Core, a huge centralized brain-like structure which controls the alien forces. The Marines are tasked with infiltrating the three data towers adjacent to the Nexus: Data Storage, Processing, and Networking. There, they will deactivate the Nexus' shield and power up the teleporter used to access the Nexus and send Kane in. Once inside, Kane will travel to the center of the Nexus to destroy the Core Brain and its guardian. After infiltrating the f...