Mark's dual personas clash as he strives to liberate Gemma from Lumon's clutches, leading to a deadly confrontation with Mr. Drummond. The enigmatic "Cold Harbor" project is unveiled, revealing the dark depths of Lumon's experiments. As chaos ensues, Mark faces a heart-wrenching choice between Gemma and Helly, culminating in a blood-soaked escape attempt that leaves viewers on edge, pondering the fate of the severed employees.