06.05 Episode 115
Airdate: July 12, 2002

O'Neill remains with the Tok'ra following his implantation with a symbiote to cure an alien virus. Carter receives a suspicious late night phone call from a Dr. Flemming, who warns of Adrian Conrad's experiments with Goa'uld symbiotes before he is apparently killed, and Carter, Teal'c, and Jonas are sent to the tiny seaside town of Steveston, Oregon to investigate. There they find the sheriff, who suspects that Flemming has been murdered. A search of Flemming's home turns up no clues until a package, which he had apparently mailed to himself, arrives. Inside, SG-1 finds a large syringe filled with an unknown serum.

Jonas notices that the townspeople seem to be unusually withdrawn, and clues suggest recent activity at the abandoned shipyard.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 analyses 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.

Carter is captured by the townspeople who implant her with a symbiote clone, and the Goa'uld reveal their plan to infiltrate both the NID and SGC. However, Carter had gambled that Flemming's syringe contained an antidote, and had injected herself with it before her capture so that the clone within her could not survive. As NID forces sweep into town, Carter works undercover to apprehend the compromised NID agents and to bring an end to their operation. The cloned Goa'ulds are susceptible to a particular antibiotic, and as the townspeople are injected with the drug, the sleepy little town returns to normal.

Written by: Joseph Mallozzi and Paul Mullie
Directed by: Peter DeLuise

Guest Starring: Blu Mankuma as Sheriff Knox, Vincent Gale as Deputy (Agent Cross), Michael Eklund as Dark Haired Man, Peter Anderson as Dr. Richard Flemming, Adrian Holmes as Special-Ops Sergeant, Scott McNeil as Townsperson, Carin Moffat as Snake Townsperson, Sean Tyson as Barkeep (Agent Singer), Dave "Squatch" Ward as Antagonistic Bar Guy, Christie Wilkes as Delivery Woman

Reference: Clones, Agent Cross, Richard Flemming, Sheriff Knox, Deputy Mullie, NID, NID Rogue Operation, Nightwalkers, Agent Singer, Steveston, Gerard Tobin