 "Star Trek" was originally left off the title because of its overuse  in previous franchise titles and because "Enterprise" was just as  instantly recognizable, from the premiere episode #1.1, "Broken  Bow", all the way through the episode #3.3, "Anomaly". After the  second season suffered low ratings, the third season adopted the  title "Star Trek: Enterprise" starting with episode #3.3,  "Extinction". When episode #3.1, "The Xindi", re