Episode 123 of "Stargate-SG1"
s06e13 Sight Unseen
Title: Sight Unseen
Original Air Date: 01/17/2003 on Sci-Fi Channel
Director: Peter F. Woeste
Writer: Damian Kindler
Guest Stars: Brad Dryborough (Outta Control Driver), Raimund Stamm (Hitchhike Driver), Jennifer Steede (Flight Attendant), Michael Karl Richards (Guardsman), Jacquie Janzen (Commissary Airman), Jacob Chaos (Ticked Off Passenger), Jody Raicot (Vernon Sharpe), Katina Robillard (Screaming Woman)
Plot Outline:
SG-1 returns through the Gate with a strange energy-emitting device and soon see mysterious discorporeal buglike creatures. The creatures are harmless and exist normally on Earth but the device conveys the ability to see them...and it's contagious. O'Neill spreads the "plague" to a small town en route to his fishing vacation. Sam and Jonas come up with a cure but Vernon Sharpe, a military vet and garage attendant who is rather paranoid of the government since being in the Gulf War, escapes the quarantine. The team tracks Vernon through his mother and Jack confronts Vernon in an abandoned hanger and convinces him to help his country by keeping the secret.