There's been a conundrum in the world of Star Trek that's been bothering fans many years. Why do Klingons look so different in every Star Trek TV series? For some of us, it's easy to explain. Star Trek: The Original Series aired in the 1960s with a measly special effects budget. To indicate an alien, all they had to do was change the shape of his ears or eyebrows, or give him an "exotic" mustache. By the time Star Trek: The Motion Picture and Star Trek: The Next Generation came about, there was money for prosthetics and they were able to make aliens look more alien. And that was fun, so they threw more into the special makeup effects with each series afterward.
But that doesn't make sense within the universe of Star Trek. Avid fans like their fantasy worlds to have a logical cohesion. You really can't blame them for wanting an explanation, because this is the kind of thing that can nag at you over the years. The producers have listened to enough complaints, and in a recent episode of Star Trek: Lower Decks, this season's finale, there appears to be somewhat of an explanation. However, even if you watched it, it could be confusing. An article at Inverse tries to parse the different ways Klingons look, although it won't be satisfactory to all fans.
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