Thoran is a loyal member of the Tok'ra resistance movement, who has had a few tense dealings with Earth. Frequently involved in heated discussions with Stargate Command members, he is fiercely protective of his symbiotic species. The interests of the Tok'ra are his first priority, even when it means ignoring the Tok'ra-Earth treaty.
When Kanan escaped the Tok'ra base to free Shallan, he returned to Earth to inform Stargate Command of the situation. He was not allowed to leave until he handed over Kanan's mission reports. (SG1: "Abyss")