This is the first time that Captain James T. Kirk's middle name of Tiberius, a name first listed in written
Star Trek (1966) guides, is revealed onscreen. Although Star Trek: The Animated Series was not considered canon by
Gene Roddenberry, many writers of later series helped to canonize several of the show's elements, and the name Tiberius was finally confirmed in
Star Trek VI: The Undiscovered Country (1991).
David Gerrold would jokingly tell fans that Tiberius was a reference to
Robert Graves' "I, Claudius". The name spread amongst fans, and Gerrold added it to the script after approval from Roddenberry. The movie
Star Trek (2009) would later provide a backstory to the origin of the name: Tiberius was Kirk's paternal grandfather.