*Jonas notices that the townspeople seem to be unusually withdrawn, and clues suggest recent activity at the abandoned shipyard. SG-1 investigates and finds computer disks, blueprints, and the partially completed construction of an alien spacecraft. That night, as Carter analyzes the serum and computer disks, Teal'c and Jonas observe the townspeople, apparently sleepwalking, arriving at the shipyard to continue construction of the alien craft. Teal'c and Jonas are captured by an undercover NID agent who reveals that immature cloned symbiotes, strong enough to exert their control only at night, have entered the townspeople. The NID has been monitoring the situation all the while.
*Source: Back of card