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The Efrosians were a sentient, humanoid species, whose homeworld was a member of the United Federation of Planets by the late 23rd century. Efrosians served in Starfleet by 2286, and an Efrosian served as the Federation President as of 2293.

Efrosians had cranial ridges, blue eyes and white hair. (Star Trek IV: The Voyage Home; DIS: "Labyrinths")

Efrosian men were generally seen wearing long hair and flowing mustaches. (Star Trek IV: The Voyage Home, Star Trek VI: The Undiscovered Country)





The name "Efrosian" was invented by Kirk Thatcher, an associate producer on Star Trek IV, in honor of unit production manager Mel Efros. (Information provided by Mel and Craig Efros) The design was based on a sketch by fantasy artist Thomas Blackshear. (Information provided by Kirk Thatcher)

The name was originally noted in initial limited Paramount publicity photos for Star Trek IV, and was never formally adopted by Paramount beyond the aforementioned publicity photos, which were printed in Cinefantastique #64 [page number?edit]. Outside of this, the Star Trek Encyclopedia, for example, avoided using the name.

The name "Efrosian" was confirmed in 2024 by Eric J. Robbins, co-writer of Star Trek: Discovery episode "Labyrinths", where the species returned for the first time since Star Trek VI. [1]

In addition to the above, the name was otherwise prominently featured in FASA's Star Trek IV Sourcebook Update – the only non-canon source circumstantially recognized by Memory Alpha for use in identifying aliens appearing in Star Trek IV.


First Lady of the Federation

Deleted scene with escorted Efrosian president

According to featured actress Lena Banks who portrayed the Federation president's assistant in Star Trek VI, the president was meant to be blind and her part was to guide him into the conference room. The scene was only part of the trailer for Star Trek VI and was cut out of the final film. (Information provided by Lena Banks)

This information was corroborated by Nicholas Meyer in the DVD audio commentary for Star Trek VI: The Undiscovered Country, and to some degree is supported by his necessity of having visual aids for the Operation Retrieve briefing for viewing the charts used in the presentation.

Unlike the president, the Efrosian helmsman of Star Trek IV was designed with white-colored irises, a feature more indicative to those found in cases of blindness.

The Efrosian appliances were memorably uncomfortable for actor Kurtwood Smith, who played the Efrosian president. In a 1998 interview, he stated, "What I remember most about Star Trek VI was the outfit, the hair and mustache. I was so uncomfortable because I could not lie down. And those contacts! I wore blue contacts, so everything was blue all the time. That was very strange. The makeup took much longer than you would think from looking at the final product. I had a whole forehead piece and this wig. That stuff took four hours to apply and a couple more to take off. I was punchy during that shoot, because I couldn't take a nap or I would ruin the hair, and because of those blue contacts." (The Official Star Trek: Voyager Magazine issue 18, p. 33)


In several novels published, the name for this species was Deltan, though differing from Ilia. The description of a long-haired male Deltan was introduced in Vonda N. McIntyre's novelization of Star Trek IV: The Voyage Home and was applied to the Federation President's race in J.M. Dillard's novelization of Star Trek VI: The Undiscovered Country.

Later novels, such as In the Name of Honor and Articles of the Federation, use the name Efrosian. They are now said to come from a planet called Efros Delta (in the Star Trek: Titan novel Taking Wing).

According to the Titan novels, Efrosians do not have a written language, with their libraries resembling music archives. They also have no concept of monogamy and children are raised by their mothers alone.

According to Star Trek: Federation - The First 150 Years, Efrosians were once subjects of the Klingon Empire but managed to successfully rebel against the Klingons.

In 2003, Decipher issued a book for their role-playing game called Aliens in which the species name was given as "Atreonid".

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