Beneath the Surface

S4, E10: SG-1 awakens in a mysterious underground complex with no memory of their previous lives. In fact they seem to possess a whole new set of memories. No longer Col. Jack O'Neill Maj. Samantha Carter Dr. Daniel Jackson and Teal'c they are Jonah Therra Carlin and Tor laborers doomed to a dreary existence working the mines beneath an ice-covered planet. Back at Stargate Command meanwhile Gen. Hammond faces the possibility that SG-1 has perished on the planet's icy surface an outcome he refuses to accept. As the general tries to unravel the team's mysterious disappearance the members of SG-1 grasp at fleeting memories of their former lives memories that are not just the keys to their freedom but to their very survival.