The third season of the American science fiction television series Star Trek: Enterprise commenced airing on UPN in the United States on September 10, 2003 and concluded on May 26, 2004 after 24 episodes. Set in the 22nd century, the series follows the adventures of the first Starfleet starship Enterprise, registration NX-01, and its crew. Starting with the third episode of this season, producers added “Star Trek” to the name of the show, previously the series was known simply as “Enterprise.” The opening theme was also changed for a more instrumental version.