AllMovie

The Starship Enterprise damages its matter/anti-matter energy converter during the rescue of a rogue spaceship, and Captain Kirk must replace the vital lithium crystals or lose his ship. But he must also reckon with Harry Mudd, the felon piloting the runaway ship -- and his "cargo" of three unnaturally seductive women. Kirk seeks help from the lithium miners on a nearby planet, but Mudd makes his own deal -- the women and Mudd's freedom, or no crystals. Amid this stand-off, matters become even more complicated when one of the women (Karen Steele) wearies of hiding the secret behind their allure.