Manufacture of the android hosts begins. Kirk's body weakens more quickly than the others, requiring additional doses of the serum. Henoch tries to tempt Thalassa into keeping their hosts' bodies, because the android forms will be incapable of sensuality. She in turn tries to convince Sargon, but he collapses. McCoy declares that Kirk's body has died and Sargon is gone. Back in sickbay, McCoy is able to revive Kirk's bodily functions, but has no way to restore Kirk's mind. Thalassa offers to restore Kirk in exchange for McCoy's help in keeping Mulhall's body. When McCoy refuses, she assaults him telepathically, but then has a change in heart and relents. The voice of Sargon commends her, and she realizes that Sargon is using the ship itself as a temporary body. She then informs McCoy that Sargon has a plan, and locks him out of the examination room, after which Chapel marches out of sickbay. McCoy reenters the examination room and finds that Kirk and Mulhall have been returned to their bodies. However, the spheres have been destroyed, including the one that held Spock's mind. Kirk says that this was "necessary", and asks McCoy to prepare a lethal hypospray for Henoch.