Mulhall, Dr. Ann
Star Trek: The Original Series
Episode: TOS 051 - Return to Tomorrow
Sargon
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Caption: Mulhall loans her body
Astrobiologist on the U.S.S. Enterprise NCC-1701 in 2268. She allowed the energy life-form called Thalessa to inhabit her body while constructing a permanent host. Thalessa almost made the loan permanent.
