to a friend, students could either "think or sink" in his class, and Kirk himself was "a stack of books with legs". Upon graduating in the top five percent, Kirk was promoted to lieutenant and served aboard the USS Farragut. While assigned to the Farragut, Kirk commanded his first planetary survey and survived a deadly attack by a bizarre cloud-like creature that killed a large portion of the Farraguts crew, including his commanding officer, Captain Garrovick. Although the surviving Executive Officer disagreed, Kirk blamed himself for years for hesitating to fire his assigned weapons upon seeing the threat until a later encounter with the creature showed that firing immediately with conventional weapons would have been useless anyway. Kirk became Starfleet's youngest starship captain after receiving command of the for a five-year mission, three years of which are depicted in the original Star Trek series. Kirk's most significant relationships in the television series are with first officer Spock and chief medical officer Dr. Leonard "Bones" McCoy. McCoy is someone to whom Kirk unburdens himself and is a foil to Spock. Robert Jewett and John Shelton Lawrence's The Myth of the American Superhero describes Kirk as "a hard-driving leader who pushes himself and his crew beyond human limits". Terry J. Erdman and Paula M. Block, in their Star Trek 101 primer, note that while "cunning, courageous and confident", Kirk also has a "tendency to ignore Starfleet regulations when he feels the end justifies the means"; he is "the quintessential officer, a man among men and a hero for the ages". Although Kirk throughout the series becomes romantically involved with various women, when confronted with a choice between a woman and the Enterprise, "his ship always won". Roddenberry wrote in a production memo that Kirk is not afraid of being fallible, but rather is afraid of the consequences to his ship and crew should he make an error in judgment. Roddenberry wrote: In Star Trek: The Motion Picture, Admiral Kirk is Chief of Starfleet Operations, and he takes command of the Enterprise from Captain Willard Decker. Star Trek creator Gene Roddenberry's novelization of The Motion Picture depicts Kirk married to a Starfleet officer killed during a transporter accident. At the beginning of Star Trek II: The Wrath of Khan, Kirk takes command of the Enterprise from Captain Spock to pursue his enemy from "Space Seed", Khan Noonien Singh. The movie introduces Kirk's former