Stargate SG-1 (1997)

S03E11 Past and Present

Title: Echoes of Memory Plot: SG-1 stumbles upon a world where the inhabitants are plagued by memory loss. The planet's ruler travels back to Earth with the team in search of a remedy, but SG-1 grows wary, questioning her true identity and motives. As they delve deeper into the mystery, they must discern friend from foe before it's too late.