|Out of universe information|
The Goa'uld Empire enslaved the race, and made them dependent on a drug called Roshna, which kept them subjugated for only Goa'uld could produce it. He possesses a unique weapon, which is a modified TER gun, and a previously unseen form of armor that shields him from Zat'nik'tel shots.
Aris Boch worked for Sokar, and his payment would be a supply of Roshna, which he would receive upon the successful capture of his bounty. Though he does this, he does demonstrate a hatred for the Goa'uld, but saw no means of fighting them, and thus resigned himself to his fate as their servant.
He encountered SG-1 on the planet PJ6-877 while hunting the Tok'ra Korra. He captured SG-1 and forced them to help him capture Korra. When the difference between the Tok'ra and the Goa'uld was explained to him, he agreed to let Teal'c take his place. They left in a Tel'tak but he Self-destructed it in midair and escaped in the escape pods, even though this made him an enemy of Sokar. As a result he stated he would have to assist other Goa'uld to get the Roshna he needs to survive. (SG1: "Deadman Switch")