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Up to date as of February 02, 2010

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The Xindi was an alliance of civilizations that all evolved on the planet Xindus, inside the Delphic Expanse. When Xindus was destroyed in the 2030s, the surviving races spread out across the Expanse. On March 22nd, 2153, the Xindi launched an attack on Earth and killed millions of humans. Investigation eventually revealed that the Xindi had been manipulated for decades by an advanced extra-dimensional civilization hoping to alter the course of history by encouraging them to destroy Earth. (ENT episode & novelization: The Expanse)

By the 24th century, the Xindi appear to be members of the United Federation of Planets. (TNG short story: "Meet with Triumph and Disaster")

Xindi Species

Six species of Xindi evolved on Xindus, and all but one species survived the cataclysm which destroyed their original homeworld. The remaining species are bound together by the Xindi Council. Despite mutual distrust and hostility, the five have made every effort to remain united, fearing a second devastating war like the conflict responsible for the loss of their homeworld.

  • Xindi-Aquatics
  • Xindi-Arboreals
  • Xindi-Avians
  • Xindi-Insectoids
  • Xindi-Primates
  • Xindi-Reptilians

The Arboreals are perhaps the most peaceful of the Xindi races, only striking out violently when attacked by others. They are known to be somewhat lethargic, although they grow agitated when around water, which seems to invoke a phobic reaction in most Arboreals. As their name indicates, they prefer to shelter in trees. Of the other four races, they are most closely allied with the Primates, who are also of mammalian stock.

The Aquatics are complicated and enigmatic and have been known to over-analyze, taking an excruciatingly long period of time to come to decisions. Xindi-Aquatic communication is highly complex and, since the Aquatics are underwater beings, they do not use their mouths, instead generating sounds through organs near their gills. When using the past tense, they switch to SONAR. They respond better to visual stimuli, however, and are extremely suspicious of the spoken word. They admire boldness and confidence and treat hushed tones with suspicion. (ENT episode: "The Council")

The Insectoids are the most numerous species, a consequence of their rapid rate of reproduction. They are asexual, and lay eggs. Their average life expectancy is twelve years. The Insectoid language is a clicking dialog that is the most unusual and complex of all Xindi languages. In fact, there are 67 dialects. Insectoids have names that grow longer and more difficult to pronounce as they grow older. They interpret raised voices as a sign of hostility. They are quick to make decisions and are often in alliance with the Reptilians. (ENT episode: "The Council")

The Primates are the Xindi race most closely resembling Humans. They are typically stereotyped as honest and trustworthy by other Xindi, but on balance are often convinced of their intellectual superiority over the other races. Nowhere near as aggressive as Reptilians or Insectoids, they are in fact possibly the most arrogant of the five species. Given their comparatively soft skin, they are not seen as being very resilient. Their engineering know-how is greatly respected, however. (ENT episode: "The Shipment")

The Reptilians are the most aggressive and militaristic of the Xindi. They are perceived as being untrustworthy and impatient by the other races, but are often called upon to defend all Xindi in times of war. Military rank often determines social status. Despite a history of conflict with the Insectoids, this is the race they most frequently associate with, to the point of sharing spacecraft. Reptilians are cold blooded, and bask under thermal lamps when aboard ships or otherwise cut off from direct solar energy. (ENT episode: "The Shipment")

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ST Expanded

Up to date as of February 07, 2010

The Star Trek Expanded Universe Database is for fanon and related content. See for the canon Star Trek wiki.

The Xindi are not a single species, but six, that all evolved from different genetic stock on the planet Xindus in the former Delphic Expanse. Under the influence of the Sphere Builders, the Xindi became embroiled in the Temporal Cold War, and launched a devastating attack on Earth in 2153, attempting to eradicate the human species. Their plans for a final assault on Earth were disrupted by the Enterprise NX-01, and peace was eventually established. The actions of the Xindi inadvertently set in motion the chain of events that led to the United Earth's emergence as a major interstellar power, and the subsequent founding of the United Federation of Planets. (ENT: "The Expanse", "The Xindi", "Zero Hour", "Storm Front", et. al)

In at least one possible future timeline, the Xindi became members of the Federation by the 26th century. (ENT: "Azati Prime")


Xindi Species

The six Xindi species eventually created a united civilization, though one species, the Avians, were believed to have gone extinct before the 22nd century. The remaining five species were governed by Xindi Council, consisting of two representatives from each species.

Despite the apparent physical differences, the Xindi species are extremely similar on a genetic level, sharing over 99.5% of their DNA. From the physical standpoint, all six species shared distinctive ridges on their cheekbones and foreheads. (ENT: "The Xindi")


Twenty-first Century

During the Great Diaspora in the 2030s, the different Xindi species engaged in a civil war that ended with the destruction of their homeworld, with only ship-board Xindi surviving. Thanks to the Sphere Builders, whom the Xindi called ‘‘"The Guardians"’’ whom they came to view as god-like beings, they were able to find habitable worlds.

Twenty-second Century

In the 2140’s, the Guardians warned the Xindi Council that unless they destroyed Earth, the Humans there would destroy their future homeworld. The Aquatics were originally against the building of a Xindi superweapon; however, they changed their minds after the Guardians presented a visual record of their future world's destruction. They eventually agreed to create it and were assigned to build the Xindi weapon, because they were the most level-headed and efficient. The weapon was built underwater on Azati Prime.

In late 2152, they agreed to the launch of a miniature prototype Xindi superweapon, which killed seven million people on Earth. This led to the Humans sending the Enterprise NX-01 into the Expanse to stop the weapon. Throughout the following year, the Council monitored their advancement, as the Reptilians and Insectoids suggested alternate ways of exterminating the Humans. At the Council meetings, the Aquatic councillors were often the more balanced and level-minded members, suggesting that they continue monitoring them instead of sending a fleet to destroy them right away.

In 2153, after finding the location of the weapon, Captain Jonathan Archer, of the Earth ship Enterprise tried to use the Insectoid shuttle to get into the weapon and destroy it, but was captured before he could do so. While he was away, the Xindi-Reptilians and Insectoids opened fire on Enterprise, nearly destroying it.

Degra didn't trust Captain Archer, but couldn't let go the possibility that he was telling the truth. In early 2154, after the Xindi Council ordered the Reptilians to cease their attack on Enterprise, Degra had the Aquatics, the only ones he could trust, transport Archer back to Enterprise. After he briefly regained consciousness aboard their vessel, he was put in an escape pod and left adrift for Enterprise to find.

The Aquatics finally decided to help the Humans when Enterprise promised to destroy the Sphere network. They sent several of their ships to fight the Reptilians and the Insectoids with Enterprise, the Arboreals and the Primates.

Unfortunately, most of their fleet was defeated when the Sphere Builders triggered the spheres to create massive anomalies, which breached the hulls of the Aquatic ships, releasing water into space.

Twenty-third Century

Star Trek: Prometheus

In the Star Trek: Prometheus continuity after locating and settling on the third planet in system SNC 461206 in Sector 441 system with the assistance of the Federation and establishing it as their new homeworld. The planet, known in Federation databases prior to the colonization as SNC 461206-III, was renamed New Xindus by the Xindi Council who had been granted a special dispensation by the President of the Federation to officially change the name of the planet. Following the establisment of Xindi-Aquatic, Xindi-Arboral, Xindi-Primate, Xindi-Insectoid, and Xindi-Reptilian settlements on the planet The Xindi Council petitioned the United Federation of Planets for membership, on behalf of their new homeworld and their colonies in the late Twenty-third century following a protracted period of peaceful and diplomatic contact.

Twenty-fourth Century

Star Trek: Prometheus

In the Star Trek: Prometheus continuity the actions of the Sphere Builders and the actions of the crew of the Enterprise (NX-01) in the twenty second century brought about the Xindi's entry into the Federation in the early twenty-fourth century, earlier than it would've been, assuming they would've joined the Federation in the first place, if the Sphere Builders hadn't attempted to tamper with the time-line.

In the early 2330's a single colony of the long thought extinct Xindi-Avains was discovered on an isolated planetoid in the Delphic Expanse. Following the re-establishment of contact with their Xindi cousins in the Federation the Avians petitioned the Federation for membership, which was granted, and re-located their colony to New-Xindus.


Until the mid-22nd century at least, the Xindi nearly worshipped the Guardians, thinking of them as saviors. Xindi children were taught to revere and give thanks to them each night. It was considered a grave offense to doubt or question a Guardian. (ENT: "The Council")

"Initiation medals" are often passed down among Xindi families from generation to generation. (ENT: "Azati Prime")

See also

External links

This article uses material from the "Xindi" article on the ST Expanded wiki at Wikia and is licensed under the Creative Commons Attribution-Share Alike License.


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