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What Star Trek Continuity Error Was Left Unexplained For 26 Years?
Vulcan Ears
Klingon Brow Ridges
Warp Drive Mechanics
Kirk's Lineage

Answer: Klingon Brow Ridges

In the original Star Trek television series, Klingons had smooth brows like humans–not a distinct ridge in sight. That changed with the release of Star Trek: The Motion Picture in 1979, where Klingons were depicted with their signature brow ridges.

The only problem was that not a single word was spoken to explain why an entire alien species had gained a very distinct facial feature. The practical reason was that the motion picture had a much bigger budget than the television series, and with a radically expanded special effects budget, the makeup artists and designers ran wild. An in-universe explanation for the change was absent. So glaringly absent, in fact, that the difference between the ridged and non-ridged Klingons became a running debate and source of rampant fan theories over the next decades.

It wasn’t until a pair of episodes from the Star Trek: Enterprise series aired in 2005, “Affliction” and “Divergence”, that the difference was fully explained. In the late 20th century, Klingons had experimented with genetically engineering their own kind (as the humans had done during that same time period). The experiments went wrong and a virus strain caused a series of mutations including the smooth forehead; outside of the mutations caused by the experiments, all Klingons should have brow ridges.

Image courtesy of Paramount Pictures.

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