Stardate 4978.5: Kirk and Spock arrest Harry Fenton Mudd who has been trying to sell "love crystals" to miners on the planet Motherlode. While in his arrest cell, he can convince Nurse Chapel to try one of his crystals to test it on Spock. Mudd manages to escape, he kidnaps Chapel and escapes on a shuttlecraft. The love potion actually works, Spock falls in love with Christine and many of the crew become infested too when the potion spreads through the ship's air supply. Spock and Kirk follow the shuttlecraft to a planet where Mudd and Chapel are under attack by rock-like creatures. The away team uses the last crystals to distract the creatures.

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