Episode 128 of "Stargate-SG1"
s06e18 Forsaken
Title: Forsaken
Original Air Date: 02/21/2003 on Sci-Fi Channel
Director: Andy Mikita
Writer: Damian Kindler
Guest Stars: Sarah Deakins (Tanis Reynard), Rob Lee (Pierce/SG-15 Leader), Dion Johnstone (Captain Warrick Trevor), Bruce Dawson (Crewman), David Paetkau (Liam Pender)
Plot Outline:
SG-1 arrives on a planet and meets humans from a colony planet of Celts but with highly advanced spaceflight technology and their own ship, the Ceberus. They are under attack by an unidentified alien race without seeming motive and the Celt team has their own secrets. We find out the Celts' ship was a prison transport and Jack and Teal'c make contact with one of the aliens . . . who claims to be the captain of the Ceberus. Each side claims they're prison transport officers and the other side are escaped prisoners. It turns out the "aliens" are telling the truth and the prisoners plan to use the Stargate to go plunder other planets and use Jonas as a hostage. Fortunately Jonas and Hammond suspected them and set up a plan to capture the prisoners when they use the Gate and end up back on Earth.