In TOS, the Klingon Empire was kept mostly a secret from outsiders.

This suggests that they were still under the drug’s influence several generations later. The Klingons on TOS were still hostile to humans and other Federation members, but they didn’t have the same habits or eating preferences that later, or earlier, Klingons had. While the true answer is that Star Trek creators decided to change the look several times because they were unsure of how the Klingons should look, the storyline is that the Klingons were victims of a drug they took in the 22nd century that stripped away their physical strength and facial ridges. However, that wasn’t advertised that often in TOS. The one thing they had that matched later Klingons was the “die with honor” warrior mindset. They didn’t have the same physical strength as other Klingons in other series did, nor did they have the same fighting style that later or previous Klingons had. Not only did they look more like humans, but they also acted very humanly in some ways, including how weak they were. They might have had bushier eyebrows than humans, and their skin color was a light brown or bronze, but other than that, they resembled humans in many ways. On the Original Series (TOS), the Klingons looked mostly human, with flat foreheads and the same physical size as humans. The Appearance of the Klingons in The Original Series Keep reading to find the full explanation. If you’ve always been curious as to why the Klingons have very different looks throughout several series, you’re not alone.

They took this to become greater warriors, but it had some unintended side effects and made them weaker, not stronger. Sometime during the 22nd century, the drug’s designed to give a race super abilities.

Klingons took an Augment drug that took away their cranial ridges and made them look human. How did they go from looking almost human to looking completely animalistic? They went from looking almost human to slight cranial ridges in the middle of their foreheads to full ridges like Worf on the Next Generation or the Discovery Klingons’ very different look. Klingons have had a very interesting history in their appearance and uniforms throughout the centuries.

How long did the klingon war last