Tin Man

Arriving on PX3989, an electrical trap renders the SG-1 team unconscious. They awaken, to find themselves in an underground lab with Harlan, he claims he is 11,000 years old, he tells the team he has fixed their injuries, and improved them as well. When the SG-1 team return to Earth, they discover that they are all now machines, that have been implanted with the consciousness of the SG-1 team.

They will die unless they return to PX3989. Harlan, is a robot himself and he can't understand why they would sacrifice their immortality. he takes them to meet themselves in hopes, he can talk them into staying as they are, Robots.