Season 6 Episode 16 - Metamorphosis

The Russian SG team brings back one of Nirrti's test subjects, who self-destructs after testifying she is working to produce a perfect human, a hok'tar. SG-1 and the Russians go to the planet and find disfigured natives who claim Nirrti is their savior – the team needs her to cure the natives and try and capture her, but the unconvinced natives use their telekinetic and telepathic abilities and everyone ends up captured. Nirrti begins to experiment on the team, killing the Russian commander and taking a special interest in Jonas, offering him supreme power. When Jonas declines she goes to work on Jack but he convinces the telepath to read Nirrti's mind – he does and they kill their "goddess," and telepathically extract the knowledge to work the machine.