03.14 Episode 58
Airdate: November 5, 1999

During a routine medical exam, SG-1 is sedated and left unconscious. Teal'c awakens to find that the base has been taken over by aliens capable of taking the form of SGC personnel. No one on base can be trusted. Carter escapes to report the foothold situation to Colonel Maybourne, but alien doubles of O'Neill and Daniel catch up with her. Their identity is revealed when Carter discovers the device that enables their physical transformation, and uses its technology against them. Returning to the SGC, she joins the real O'Neill and Major Davis to expose and defeat the retreating aliens.

Written by: Heather E. Ash
Directed by: Andy Mikita

Guest Starring: Tom McBeath as Colonel Harry Maybourne, Colin Cunningham as Major Davis, Teryl Rothery as Dr. Fraiser, Richard Leacock as Colonel Brogen, Colin Lawrence as Sergeant Warren, Dan Shea as Sergeant Siler, Alex Zahara as Alien Leader/Alien #1, Dion Johnstone as Alien #2, Tracy Westerholm as Surveillance SF, Biski Gugushe as SF Guard

Reference: Paul Davis, Foothold, Hazmat, Holographic Projection, Harry Maybourne, Mimic Device, NID, NID Rogue Operation, Old Bailiff Café, P3X-118, SF Guard, Sergeant Siler, Major Warren


Level 23

Aliens of P3X-118