The Enterprise is on course to install new equipment on Memory Alpha, the central library storage facility for the Federation. Chief Engineer Scott has been working closely on the project with Lieutenant Mira Romaine with whom he has been forming a romantic attachment. The Enterprise encounters a space storm that kills the staff at Memory Alpha and possesses Lieutenant Mira Romaine. Written by
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Kirk and McCoy save Lt. Romaine by putting her in the decompression chamber and increasing the pressure until the aliens leave. However, it is never specified how the plan was developed or with what information. See more
There is an identity of minds taking place between the alien beings and the mind of Lt. Romaine. Their thoughts are becoming hers.