This is a Worf episode--and Worf episodes are always quite good, as he is a very interesting character with a strong and likable presence. The show begins with an emissary from the Federation arriving at the Enterprise. However, speed is of the utmost importance, so this agent is sent in a tiny coffin-like machine flying at warp 9! Worf is surprised when out of the device walks K'Ehleyr--a woman he knows and who is of human and Klingon parentage. It's very obvious that they have a past--but what it is you'll have to see as the episode progresses. As to why she's there, it turns out that a ship filled with Klingon warriors has been in suspended animation for decades--well before the Empire joined the Federation. So, the worry is that when they awaken, they'll once again renew attacks on Federation space...needlessly killing untold innocent people.
As I said, it's a Worf episode and spends time allowing his character to grow and evolve. I wonder if they way the story eventually went with K'Ehleyr is what they originally intended or was someone else once envisioned for this could...
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