- Dr. McCoy discovers his old flame is not what she seems after crew members begin dying from a sudden lack of salt in their bodies.
- In the series premiere, the Enterprise visits planet M-113 where scientists Dr. Crater and his wife Nancy, an old girlfriend of Dr. McCoy, are studying the remains of an ancient civilization. When Enterprise crewmen begin turning up dead under mysterious circumstances, Kirk and Spock must unravel the clues to discover how, why, and who is responsible.—JW Kearse
- When the Enterprise visits the planet M-113, Kirk and McCoy meet with scientist Professor Crater and McCoy's past love Nancy Crater. While there, members of the Enterprise start dying with no explanation besides having tentacle marks on their bodies and having a depletion of salt in their bodies too. Kirk, Spock, and McCoy all help investigate this to find out who is the killer and why.—James Hake
- Captain James T. Kirk (William Shatner) is The commanding officer of the USS Enterprise. Commander Spock (Leonard Nimoy) The ship's half-human/half-Vulcan science officer and first/executive officer Lieutenant Commander Dr. Leonard "Bones" McCoy (DeForest Kelley) The ship's chief medical officer Lieutenant Commander Montgomery "Scotty" Scott (James Doohan) The Enterprise's chief engineer and second officer Lieutenant Nyota Uhura (Nichelle Nichols) The ship's communications officer Lieutenant Hikaru Sulu (George Takei) The ship's helmsman Nurse Christine Chapel (Majel Barrett) The ship's head nurse
The Enterprise visits planet M-113 for routine medical examinations of the husband-and-wife (Robert Crater and Nancy) archaeological team stationed there. McCoy used to have a relationship with Nancy, ten years ago. Nancy appears to all 3 men of the landing party in 3 different forms. Nancy lures Darnell, a member of Kirk's landing party away, seducing him. Robert comes to meet McCoy and Kirk. Robert asks for more salt to be sent to the planet due to its heat.
McCoy talks about how Nancy has no gray hair and Kirk thinks its his affection for Nancy talking, to him Nancy appears of a normal age. They hear Nancy screaming and find Darnell dead. Nancy claims that Darnell died by eating a local plant species which was poisonous. Nancy has been replaced by a shape-shifting creature forced to survive by extracting the salt from the bodies of members of the crew, killing them. Kirk beams back up with McCoy and Darnell. A proper check reveals Darnell has no salt in his body. He is curios as both Nancy and Robert specifically wanted salt tablets to be supplied. Spock is the logical Vulcan. Uhura is a passionate lady.
Down on the planet, Kirk and McCoy land with 2 men, who are sent to find Nancy, who both die. Kirk wants to arrest Nancy and Robert and take them to the Enterprise. Nancy shape shifts into a dead crewman Green to meet Kirk and McCoy who found the other dead crewman Sturgeon. Kirk, McCoy and Green (Shape Shifted Nancy) return to the Enterprise. Spock can only find Robert on the planet, while Green goes off in search of salt. Green gets more & more desperate and shape shifts into Nancy to meet McCoy. Nancy is able to put McCoy to sleep in his cabin and then shape shifts into McCoy to hunt for more crewmen.
Kirk and Spock beam down to meet Robert. Spock finds Green's dead body on the planet. Meanwhile the creature as McCoy reaches the bridge and gets access to all security protocols. Robert meanwhile reveals that Nancy was killed by the shape shifting creature of the planet (who needed salt to survive), who is the last of its kind. Kirk returns to Enterprise with Spock and Robert and lays salt tablets as bait to catch the creature Kirk wants Robert to help him find the creature, but Robert refuses as the creature is simply trying to survive. Kirk orders the truth serum to be injected into Robert and Spock accompanies McCoy. The creature, as McCoy, attacks Spock and kills Robert. Creature gets back to the real McCoy and shape shifts into Nancy and wants McCoy to protect it from Kirk. Kirk and Spock enter the room and beg McCoy to see that the creature is not Nancy. The creature has super human strength and can paralyze Kirk. It is about to kill Kirk when Spock intervenes. Only when the creature shape shifts into its original form, is McCoy able to shoot and kill it.
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