The term 'Enterprise Officer' refers to the three main characters of the original Star Trek series: Captain James T. Kirk, Lieutenant Commander Spock, and Lieutenant Uhura. The first officer of the USS Enterprise is Captain Kirk, played by William Shatner. His Vulcan science officer is Spock, played by Leonard Nimoy. The communications officer is Lieutenant Uhura, played by Nichelle Nichols. The crossword solutions for these characters are SULU (4 letters) for Captain Kirk, UHURA (5 letters) for Lieutenant Uhura, and SPOCK (5 letters) for Lieutenant Commander Spock.