This film marked the first appearance of the ridged-forehead Klingons. In Star Trek (1966), Gene Roddenberry wanted the Klingons to look alien, but budget constraints prevented this from being done beyond giving the actors dark makeup and fake eyebrows. The film's increased production budget finally allowed for more prosthetic appliances. The change in the Klingons' appearance wasn't formally addressed until Star Trek: Deep Space Nine: Trials and Tribble-ations (1996), establishing the existence of smooth-forehead Klingons: when asked about this discrepancy, the character Worf simply said "They are Klingons. And it is a long story. [..] We do not discuss it with outsiders." When ridged-forehead Klingons appeared in the prequel series Enterprise (2001), this prompted the need for an in-universe explanation to the brief presence of smooth-forehead Klingons. The episodes Enterprise: Affliction (2005) and Enterprise: Divergence (2005) showed that their existence resulted from a viral mutation caused by Klingon experimentation with enhanced human DNA.

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