Welcome to Star Trek Answers. What would you like to know?

Evolution? The Cranial Ridges occur naturally if you're hinting at how Klingons from the original series didn't have ridges the answer lies in the Klingon Augment Virus Crisis.

Real world answer: the producers of Star Trek: The Motion Picture wanted Klingons to look truly alien, and had a sufficient make-up budget for it.


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