Development of Appearance and Characterization
In the first appearance of Trill in the TNG episode "The Host", Trill were depicted physically quite differently than their later appearances. Also, they were unable to be safely transported via transporter, a weakness not shown in later appearances when Trill became a regularly used race. No explanation of the differences is ever given onscreen, but according to an article on startrek.com, humanoid Trills are actually composed of at least two races that can be used as hosts for the symbiont. It is also revealed in this episode that humans can also serve as temporary hosts to the symbionts when Commander William Riker hosted Odan's symbiont. The crew's general unfamiliarity with the race is a minor contradiction with later episodes, which stated that the Trill (such as Curzon Dax) had been working with the Federation regularly long before their first appearance in Star Trek: Deep Space Nine; "Trials and Tribble-ations" implied that a host of Dax was romantically involved with Leonard McCoy when the original Star Trek series character was still a college student. Other differences included the change in makeup style from a prosthetic forehead to a series of spots, although some makeup tests and sketches were made in the preproduction of Deep Space Nine using the earlier makeup style, but the actress who would play Jadzia Dax, Terry Farrell, proved allergic to the extensive prostheses, and so the new style was created. The Trill naming style, of using their host name as a first name and their symbiont name as a surname, differs from their first appearance, in which the Trill Odan was only known by that one name.
Read more about this topic: Trill (Star Trek)
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