[ENT] Season 4, Episode 16: Divergence
Rating: 3
Divergence draws the Klingon arc to a satisfying conclusion. As with the entirety of this story, it’s entertaining, fills in some historical Trek information, and nudges the characters forward a bit, without leaning too much into greater themes or character work that can elevate a Trek story.
Read more at Memory Alpha
Notes:

Archer has to be injected with a Klingon thing because it helps in some way. Testing it out or something. You get it.

Phlox beams over some virus to the attacking Klingons so they become a little more interested in finding the cure.

This whole thing was meant to explain the look of Klingons in TOS. It makes about as much sense as it possibly could have. I’m actually impressed?
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