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Ah'len, a Xyrillian female

The Xyrillians were a peaceful, warp-capable species of humanoids with smooth, brown, scaly skin.


Xyrillians had an unusual physiology. They did not have a metabolism based on water or breathe an oxygen-based atmosphere. In fact, their high-pressure atmosphere was hallucinogenic to most species, and as a result, most other humanoids needed to be weaned onto and off their atmosphere to avoid undesired effects. When traveling, they grew edible vegetation on the walls of their ships, and had eel-like creatures swimming in tanks.

It is unknown if the Xyrillians kept the eels as food, decoration, pets, or any other purpose.

Xyrillians also had dermal plating which they found necessary for detecting each other's moods. Apart from this plating and the fact they were slightly shorter than the typical Human, there wasn't a lot of obvious physical characteristics that distinguished Xyrillians from Humans.

Xyrillian males usually carried infants to term in a pouch on the upper chest. They served only as hosts, and the offspring only contained genetic material from the mother. Impregnation could occur with only minor physical contact. Humans and Xyrillians were genetically compatible, as Commander Tucker discovered when he was impregnated by a Xyrillian female. He also developed a nipple on his wrist, but it is unknown if this occurred with Xyrillian males as well or if it was a weird reaction of inter-species reproduction with Humans.


The Xyrillians had their own language. Their translation of "We are complying with your request. We ask you not to harm us," was "Kaja lakala royj kaiti."

In the script for "Unexpected", this phrase is phonetically notated as, "KAI-uh la-CALL-uh ROYZH kai-TEE."


The Xyrillians were, technologically, far superior to Humans in 2151. They had the technology to simulate any environment they could envision (see holodeck), as well as advanced stealth technology.

There was also a Xyrillian game involving glowing granules which enabled two individuals (even if they were not the same species) to become telepathic and read each others' minds. (ENT: "Unexpected")

See alsoEdit


As well as appearing in "Unexpected", Xyrillians are additionally referenced in "Shuttlepod One" and (technically) "Oasis".
In the script for "Unexpected", the Xyrillians are described as "exotic humanoids, glistening with moist, scaly skin."

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