(written from a Production point of view)
Enterprise's second season begins with the NX-01 being cleared of any wrong-doing involving the destruction of the Paraagan II colony in the first season's finale. With a renewed sense of exploration, Enterprise continues humanity's journey to seek out new worlds and new civilizations.
Like season one, the adventures of Enterprise are largely independent of one another. Familiar faces such as the Klingons make appearances in "Marauders" and "Judgment"; the Kreetassans, introduced in season one's "Vox Sola" return in "A Night in Sickbay"; and the Vulcan/Andorian saga from season one's "The Andorian Incident" continues in "Cease Fire". Season two also re-introduced a number of species from previous Star Trek series into the lore of Enterprise, such as the Tellarites from the original series in "Bounty" as well as the Tholians in "Future Tense" and, perhaps most polarizing of all, the Borg make an appearance in "Regeneration", stemming from the destruction of the Borg sphere at the hands of the USS Enterprise-E in Earth's past from the movie Star Trek: First Contact. Early in the season, the crew are introduced to the Romulan Star Empire when the NX-01 inadvertently stumbles upon a Romulan minefield, setting in motion a chain of events between Humans and Romulans that eventually culminates in the Earth-Romulan War.
Like the appearance of the Ferengi in season one's "Acquisition", the use of the Borg by the producers was seen by many fans as potentially in violation of established canon. (citation needed • edit) However, such as in "Acquisition", the name of the Borg is never uttered, preventing the crew of Enterprise from learning the true nature of their adversaries, paving the way for future generations of Starfleet officers to face them in their own time.
"Sounds to me like we've only postponed the invasion until... what? The 24th century?"
- - Archer
However, season two did nothing to halt the dwindling numbers of Star Trek's audience. Ratings for the series continued to slide from the series premiere and the box office returns for Star Trek Nemesis (which was also released during the course of the season) seemed to indicate that the franchise's days were numbered. Faced with the very real possibility that Enterprise might not last seven seasons like the previous three series did, major creative shakeups were begun in the season finale, "The Expanse". Earth is attacked, and Enterprise is recalled home and sets out on a new mission to find those responsible in an unexplored and potentially dangerous part of space known as "The Delphic Expanse."
- Star Trek Nemesis was released during the run of this season.
- This is the first season of any Star Trek series not to be released on VHS in the UK, owing to the rise in popularity of DVD as a medium for home entertainment.
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