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Therra was the personality that was imprinted onto Carter when she was given a memory stamp and forced to become one of the underground workers on P3R-118, with no memory of her past. Therra developed a mutual attraction toward Jona, and she offered scientific innovations to improve conditions within the facility.

Portrayed by: Amanda Tapping

Cross Reference: Brenna, Calder, Carlin, Jona, Kegan, Memory Stamp, Nightsickness, P3R-118, Tor

Episode Reference: Beneath the Surface