First science fiction movie or tv show that had a complete language created for it?

Question

I read a question about what the language used in 1951's The Day the Earth Stood Still was based upon and I guessed, apparently rightly, that it was just made up. I also of course know that there is a Klingon-English dictionary for the language spoken in Star Trek flicks (I do not think STOS had any linguist-created language). So was one of the Star Trek flicks the first movie to bother with creating a "real" artificial language? Did anyone try, even short of a full vocabulary but maybe basic, 300 or 800 words of a language prior to Star Trek?

EDIT: I want to motivate the question. I am amazed that some movie or tv producer would go through the expense but I actually think it is worth it -- this is a detail that even a non-linguist can hear in a "real" language vs gibberish. I have not looked up star wars but my money is on a linguist having been involved.

Answer 1

I'll propose Pakuni from 1974 Land of the Lost series. Since they were primitive apemen - a 300 word language on a technicality has the best chance of being "complete". See http://lotl.popapostle.com/html/pakuni.htm

Though obviously Star Trek III's Klingon dictionary and Tolkien's elf languages are more notable in other ways.

Answer 2

Ubbi Dubbi was created in 1972 for the PBS children's show Zoom.

Because it is derived from English, it is a matter of opinion whether it counts for this question (i.e. what constitutes "creating" a language). On one hand, it is not completely artificial like Klingon or Tolkien languages. On the other hand, Ubbi Dubbi is as "complete" as English, unlike the other languages.

Answer 3

Probably the 1974 children’s TV series Land of the Lost, with the language Pakuni, created by UCLA linguist Victoria Fromkin.

I take the question as asking about languages developed beyond isolated words or language games, into at least a rudimentary conlang (constructed language). Wikipedia has a handy list of conlangs in fiction. Digging into their examples, the earliest ones in film and television are:

• 1974: Pakuni, Land of the Lost, created by Victoria Fromkin
• 1982: Vulcan, Star Trek (isolated words appeared from 1966; first developed into a rudimentary conlang in 1982 for The Wrath of Khan, by Marc Okrand)
• 1985: Klingon, Star Trek (isolated words appeared from 1979; developed into a basic conlang for The Search for Spock, again by Marc Okrand)

So Pakuni appears to be the first of these to be developed into a systematic, if rudimentary, conlang. Frath Wiki, a conlang wiki, supports the belief that this was the earliest:

Pakuni is of interest to the conlanging community primarily as a matter of historical fact. Later inventions, such as Klingon and Na'vi, are certainly more well known. […] Okrand [for Star Trek] and Frommer [for Avatar] and Peterson [Game of Thrones] have raised the bar immensely […] It is simply the case that Fromkin [creator of Pakuni] was showing them how to do it, way back in the 1970s.

There is a longer history of fictional conlangs in literature. Tolkien is widely credited for their first use, with the languages of Lord of the Rings (published 1954); this previous sff.se answer discusses and supports that claim. His languages of Middle-Earth were far more developed than the above early film/TV examples were when introduced.

(Note: Pakuni has already been named in @lucasbachmann’s answer, but I wanted to add some information and context to back up the claim that it’s the first.)