The Klingon makeups in Star Trek VI had to work well in sync with the lighting. Cinematographer Hiro Narita offered, "Sometimes in a warm ambient [light], the Klingons looked too red, so the makeup people had to adjust it or I'd adjust my lighting here and there." (The Making of the Trek Films, UK 3rd ed., p. 116) This was despite the fact that the Klingons had, by now, a red color scheme. It was used for ship interiors in Star Trek VI as well as in earlier films and briefcases in the sixth film, though not for a judge's gavel in the same movie. (The Making of the Trek Films, UK 3rd ed., pp. 116, 129 & 128)
Answering a casting call for Klingon extras in the Spring of 1991, TNG Pre-Production Associate Eric A. Stillwell and Trent Christopher Ganino, who co-wrote the story for "Yesterday's Enterprise" with Stillwell, signed up to be Klingon extras for Star Trek VI, as Nicholas Meyer required a roomful of Klingons for the film's trial scene. (Star Trek: Communicator issue 114, p. 29) "Trent got to be one of the three Klingon judges," Stillwell explained, "and I was one of the non-descript Klingons in the rafters." [15] Stillwell continued, "I soon learned that being a Klingon is no easy task [....] Unlike Klingons with speaking roles, Klingon extras don't wear perfectly sculptured prosthetics with carefully crafted make-up applications. Instead, the make-up staff painted dark circles around my eyes to hide the eye holes cut into the heavy rubber mask I would wear over my head. With my rubber neck tucked tightly under the collar of my costume, it was impossible to remove the mask except during lunch breaks and the end of the day." As the trial scene was scheduled to take two 16-hour days to film, the extras stood in the courtroom set for hours on end. They encountered problems with their heavy rubber masks, because the performers could hardly breath through the masks' tiny nose holes. The conditions on the set were also difficult, as the camera lights heightened temperatures inside the masks to almost unbearable degrees and visibility was hampered by smoke pumped into the room. "The sweat dripping from our rubber eye holes made us look like a bunch of bawling bad guys," related Stillwell. As the first day wore on, an increasing number of the performers seemed to disappear into adjacent sets, which were to be used for depicting Kronos One and were coolly heated as well as darkly lit. On the second day, Stillwell had the forethought to use a turkey baster to pry open the rubber lips of his mask, whereas an assistant director found tampons for all the other extras to use as breathing tubes. Stillwell concluded, "Nicholas Meyer had to remind us to remove the tubes from our rubber lips whenever the camera rolled, least we appear on film as a bunch of Klingons with serious nicotine habits!" (Star Trek: Communicator issue 114, p. 29)
As a sign of the times, Star Trek Monthly issue 92, p. 26 deemed the reappearance of Klingons in a film production any time soon wasn't foreseeable. The magazine hypothesized, "It's more than likely that the Klingons have had their motion picture day, for the moment at least."
Before it was even confirmed that his production company Bad Robot would be involved in a sequel to the Star Trek film, J.J. Abrams was highly interested in including Klingons in such a movie. (deleted scene "Prison Interrogation and Breakout" audio commentary, Star Trek (Special Edition & Three disc Blu-ray)) Once his connection to the film was announced, Abrams conceded that "it would be hard not to" introduce them in the alternate reality. (SFX, issue #200, p. 60) Because the Star Trek movies Abrams directed were always about reinventing and modernizing familiar aspects without losing their essence, it was virtually inevitable that Klingons would feature into the sequel film, entitled Star Trek Into Darkness. However, the Klingons were temporarily written out of the film, when it was at a stage of early development. (Star Trek: The Official Starships Collection, D4 Bird-of-Prey Special Issue, pp. 6 & 9) Abrams commented, "I do think that the idea of doing Star Trek and bringing Klingons into the world is an obvious and cool challenge. And how do you do it?" Producer Bryan Burk felt likewise, commenting, "Klingons are ingrained in the tapestry of Star Trek as any other villain, so you desperately want to get them in sooner than later." ("The Klingon Home World", Star Trek Into Darkness (Blu-ray), Star Trek Into Darkness (Blu-ray 3D), Star Trek/Star Trek Into Darkness (Blu-ray) & Star Trek: The Compendium special features) Roberto Orci also felt the pressure to incorporate the species in the sequel. "Some fans really want to see Klingons, and it's hard not to listen to that," he admitted. "The trick is not to do something that's been seen before just because you think it will be a short cut to likeability." (SFX, issue #200, p. 61)
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