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A mysterious female apparition begins to murder Enterprise crew members one by one in this third season episode of the well-known science fiction series. This beautiful but frightening creature with deadly powers first appears to Captain Kirk and the crew in the Enterprise transporter room, where her touch leaves one crew member dead. Unable to respond, thanks to the woman's ability to appear and disappear seemingly at will, Kirk and his landing party descend to the planet below in search of an explanation. However, the Enterprise is soon thrown into even more chaos when the being uses her powers to send the Enterprise far out of range, stranding Kirk and the others on an unknown world. She continues to appear, both on the planet and on the Enterprise, using her powers to effectively prevent any rescue attempts. Captain Kirk and his crew must discover the reason behind this seemingly magical apparition and find a way to defeat her, before they are killed off one by one.