Stargate Atlantis (2004)

S1E15 Before I Sleep

The team uncovers a woman in suspended animation within the depths of Atlantis, only to their astonishment, it's Dr. Weir. She reveals that she has traveled back 10,000 years into the city’s history, sharing her incredible experiences and the circumstances that led to her unexpected time leap. The revelation prompts the team to grapple with the implications of her journey and the mysteries of Atlantis's ancient past.