Season 3 Episode 7 - Dead Man's Switch

SG-1 travels to planet PJ6-877 for a routine exploration. Almost immediately after arriving, they are captured in an invisible force-field by alien bounty hunter Aris Boch. Aris takes them to his cargo ship, which is completely invisible from the outside. He has come to this planet to hunt a Goa'uld named Kel'tar who is wanted by the evil system Lord Sokar. He attempts to solicit help from SG-1, in exchange for their freedom. He informs them that should they refuse to participate, he will take them to Sokar. There are sizable bounties on the heads of Teal'c and Samantha Carter, a reasonable bounty on the head of Jack O'Neill, but Daniel Jackson could probably only be traded for a day's rations.

After an unsuccessful escape attempt, SG-1 agrees to help Aris Boch catch his Goa'uld. Carter remains with Aris at a safe distance from the cave that Kel'tar is hiding in, while Jack, Daniel and Teal'c go in for the retrieval. When Kel'tar is captured, he informs SG-1 that he is not Goa'uld, he is a Tok'ra named Korra. If handed over by Aris to Sokar, he would torture Korra to gain information that would endanger many other Tok'ra.

SG-1 and their Tok'ra ally must find a means of escape or try to convince the cold-hearted bounty hunter for once, to do the right thing. Unfortunately, Aris Boch's life is dependent on something only the Goa'ulds can supply to him. In order to get it, they must trade in lives.