Star Trek: Enterprise (simply titled Enterprise until the third episode of season three) is an American science-fiction television series created by Rick Berman and Brannon Brage as a prequel to Star Trek: The Original Series.
Premise
Set in the 22nd century 100 years before the USS Enterprise's five-year mission in Star Trek: The Original Series, the series follows the adventures of the crew of the first Warp 5 capable Starfleet starship, Enterprise (registration NX-01), as they explore the galaxy.
Why It Was Cancelled
In June 2004, there was a major turn over of staff with Jonathan Dolgen, the head of entertainment at parent company Viacom, quitting following the departure of Viacom President Mel Karmazin. Following this, several other staff members left as well. During these departures, UPN was purchased by CBS. While the show was surprisingly renewed for a third season following a reduction in the fees which Paramount was charging UPN on a per-episode basis, the show was moved to a Friday evening slot, the same night that The Original Series was broadcast on during its third season before it was cancelled. This may have been due to ratings growing low as the series progressed.