Star Trek: Enterprise, titled simply Enterprise for its first two seasons, is an American science fiction television series created by Rick Berman and Brannon Braga. It originally aired from September 26, 2001, to May 13, 2005, on UPN, spanning 98 episodes across four seasons. The sixth series in the Star Trek franchise, it served as a prequel to Star Trek: The Original Series. The show is set in the 22nd century, a hundred years before the events of The Original Series and just prior to the formation of the United Federation of Planets. The series follows the adventures of the Enterprise, Earth's first starship capable of traveling at warp five, as it explores the galaxy and encounters various alien species.