In the
Star Trek universe, a
neutral zone is a sort of "
buffer zone" between the territories of two different powers; if either party enters a neutral zone, it is considered an aggressive move (usually an act of
war). In the course of the various series, the
Federation develops two neutral zones: One with the
Klingon Empire and one with the
Romulan Star Empire; the generic term "the Neutral Zone" usually refers to the Romulan Neutral Zone. Also, a neutral zone in all but name exists between the Federation and the Cardassians.
Cardassian Demilitarized Zone There is a Federation-
Cardassian demilitarized zone created at the end of hostilities between the two powers in the mid-24th century. The peace treaty ending the war and subsequent border adjustments result in several Federation worlds within the zone being ceded to the Cardassians, and vice versa. Militant Federation colonists called the
Maquis form a
guerrilla militia to oppose the treaty and their new Cardassian administrators; they receive assistance from sympathetic Federation citizens, including several Starfleet officers, and from
Bajoran veterans of the long Cardassian occupation of Bajor. The DMZ ceases to exist at the outbreak of the
Dominion War in 2373; the Maquis are subsequently eliminated as a functional resistance group by a joint Cardassian-Dominion task force.
Klingon Neutral Zone The Klingon Neutral Zone, sometimes known as the
Organian Neutral Zone, appears to be set up during the time of the
Star Trek: The Original Series. Unlike the Romulan Neutral Zone, the Klingon Neutral Zone appears to have some commercial traffic crossing it. The Organians are non-corporeal beings from the planet Organia IV, which is strategically situated between the Klingon Empire and the Federation. When both parties, thinking the Organians are a pre-industrial people, attempt to occupy their world, the Organians reveal their
posthuman nature and impose the Neutral Zone and a peace treaty between the two powers. In
Klingon, this treaty is known as ''orghenya' rojmab'' (Organian Peace Treaty). The zone is the site of the
Kobayashi Maru scenario in the film
Star Trek II: The Wrath of Khan. The Klingon Neutral Zone is abolished by the
Khitomer Accords in 2293. In
Star Trek Into Darkness, set in an alternate reality, the USS
Enterprise violates the Neutral Zone to capture
Khan Noonien Singh.
Romulan Neutral Zone The Romulan Neutral Zone is established around 2160 or 2161 by the treaty of Algeron which ends the
Earth-Romulan War, and is still in effect at the end of
Star Trek Nemesis. In the 2009 film
Star Trek (specifically the events depicted in the year 2387),
Romulus is destroyed when its star goes supernova. Like the Klingon Neutral Zone, any entry into the region by either party is considered an act of war; this is not violated until 2266, when the Romulans cross it, but a war is avoided nevertheless. The
Enterprise (NCC-1701) crosses the Neutral Zone three times: Once to get to a
starbase quickly when the crew is suffering accelerated aging, once when it is commandeered by a group of disestablishmentarians in their quest for
paradise, and once more when the Federation attempts to steal a Romulan
cloaking device. The Neutral Zone remains uncrossed during a period of extended Romulan
isolationism. In 2364, several Federation and Romulan outposts along their respective sides of the Neutral Zone are destroyed by unknown forces. The
Enterprise-D is ordered to investigate. While visiting some of the Federation sites, Captain Picard encounters a Romulan ship that has crossed the Neutral Zone. Each side suspects the other of being responsible for the attacks. This encounter between representatives of the Federation and the Romulan Empire—the first in over 60 years—ends peacefully. (These events occur in
The Next Generation first-season episode "
The Neutral Zone".) It is determined several months later that the destruction was caused by the
Borg. The following year, the USS
Yamato crosses into the Neutral Zone to prevent the Romulans from finding the Iconian home world, an abandoned planet that contains highly advanced
technology. In 2366, the Romulan scout ship
Pi crashes just inside of Federation space, and a Romulan ship crosses over to recover survivors. Finally, in the same year, a Romulan defects to the Federation, breaching the Neutral Zone, warning of a secret plan to attack the Federation; the
Enterprise-D, along with three Klingon warships, in turn, cross the Neutral Zone to investigate the claim. Subsequent covert incursions of the Neutral Zone include the Romulans' plan to invade
Vulcan using disguised Vulcan ships. An overt but lawful entry into the Neutral Zone occurs when the USS
Bellerophon participates in a Federation–Romulan conference on Romulus during the
Dominion War. In
Star Trek Nemesis, Shinzon lies that he wishes to take down the zone as part of his ultimately failed plot to destroy Earth and the rest of the Federation. Following the destruction of Romulus in 2387, the Romulan Empire collapsed. With no formal government to enforce the treaty, the Romulan Neutral Zone ceased to exist. ==Sector 001==