"What Are Little Girls Made Of?" is the seventh episode of the first season of the American science fiction television series, Star Trek. Written by Robert Bloch and directed by James Goldstone, it first aired on October 20, 1966. In the episode, Nurse Chapel searches for her long lost fiancé and uncovers his secret plan to create sophisticated androids for galactic conquest. The first episode of the series to be repeated on NBC, the title of the episode is taken from the fourth line of the 19th-century nursery rhyme, "What Are Little Boys Made Of?" Plot The USS Enterprise, under the command of Captain Kirk, travels to the icy planet Exo-III to search for the exobiologist Dr. Roger Korby. Korby was the fiancé of Dr. McCoy's temporary assistant, Nurse Christine Chapel, who signed on to the Enterprise to search for Korby. At Korby's request, Kirk and Chapel beam down alone to a cavern entrance, but Korby is not there to meet them. Finding this suspicious, Kirk has two security officers beamed down from the Enterprise. One is instructed to stay at the entrance and keep a lookout, and the other accompanies Kirk and Chapel. The three begin to descend into a system of caves. When passing over a deep chasm, the security officer disappears. Shortly after, they meet Korby's aide Dr. Brown. Chapel recognizes him but is surprised the man does not remember her. Brown assures them that the security officer fell by accident, and the three continue on. Kirk contacts the remaining security officer and tells him to contact the Enterprise for reinforcements, but a strange creature kills the officer before he gets the chance. Meanwhile, Kirk, Chapel and Brown find Korby, who tells them that the caves were left by an extinct race. Korby shows Kirk and Chapel machinery that creates androids. With the help of Ruk, a still-functioning android from the time of the original inhabitants, Korby has created more androids, one being a beautiful woman he calls "Andrea". Brown is also an android. It is also revealed that Ruk had killed the security officers. Korby creates an android duplicate of Kirk as Chapel looks on. As Kirk's personality is imprinted on the android, the real Kirk imagines himself insulting Spock as a "half-breed". Korby has the duplicate Kirk beamed aboard the Enterprise with orders to identify a planet suitable for creating more androids. When Spock questions