Vendorian shapeshifter in true form; note the six tentacles

The Vendorians were a cephalopodic shapeshifting non-humanoid species that had perfected the techniques of cellular metamorphosis, and were capable of rearranging their own cellular structures to imitate any person or object of similar size and mass. While Vendorians could assume many shapes and identities, the longer they remained in one form the more characteristics of that form they would assume. This was particularly true when a Vendorian assumed a humanoid form. In these instances, the Vendorian absorbed memories and personality traits of an individual through touch. These memories and traits became more ingrained the longer or more frequently the Vendorian assumed the form; if maintained long enough, the absorbed traits eventually became part of the Vendorian's own personality.

As they demonstrated in their ultimately unsuccessful efforts to save the life of trader and philanthropist Carter Winston, Vendorians were excellent surgeons – due in no small part to having six tentacles in their true forms – and they likewise possessed knowledge of other branches of medicine.

Vendorians also had the ability to render some humanoids, particularly Humans, unconscious by touch alone.

It is unknown whether this process is chemical/electrical or mechanical, such as the Vulcan nerve pinch. Though it was demonstrated several times on-screen, no explanation was ever provided.

Unfortunately for communities of worlds, the Vendorians practice deception as a way of life, and they have been deemed psychologically unfit to participate in such communities on those grounds. Indeed, due to the Vendorians's deceitful way of life, the Federation has imposed a quarantine on their homeworld, Vendor, declaring it off-limits to travelers.

Under the terms of the treaty between the Federation and the Romulan Empire, any use of Vendorian spies (or, indeed, any deception that either side practiced upon the other to lure that other into and/or across the border between the two governments) was considered a violation of the treaty and hence an act of war. (TAS: "The Survivor")

It is unknown if this refers to the treaty established following the Earth-Romulan War of 2161, or the more recent Neutral Zone Treaty.
The animated depiction of the Vendorian has six tentacles. However, the novelization of "The Survivor" that was published in Star Trek Log 2 describes it as having seven tentacles.
The same adaptation (as well as the start of the novelization of TAS: "The Lorelei Signal", as published in the same book) establishes a history between the Vendorians and Romulans, stating that – for several years prior to 2269 – there was a period in which the Romulans frequently visited the Vendorian homeworld, interested in an alliance between the two species. The Vendorians kept rejecting the Romulan offer of such an alliance, as the Vendorian impostor of Carter Winston explained.

The shapeshifting process Edit

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