Stargate SG-1 - Season 4 Episode 10 -

The SG1 team awake to find they have lost their memories. They believe they are workers in an underground power station. They are told that they are helping to preserve life during an ice age. In truth they are slave labor to a huge domed city above and when Teal'c starts to recover his memory and is given another amnesia treatment he forgets his Kelnorim and starts to die. Will the others recover their memories in time to save him?