DS9:
"Blood Oath" (season 2)
and
"The Sword of Kahless" (season 4)
Back to back. Plan to watch "Once More Unto the Breach" from season 7. I'm in a Kor frame of mind.
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I couldn't help thinking that they rushed too fast to have Kor (John Colicos) say "Glorious" in "The Sword of Kahless." Instead of spreading his hands as if he was opening the wormhole and saying just "Glorious" at the beginning of his, Dax's, and Worf's quest, they could have had him say the exact same line he said in "Errand of Mercy" at the end of the episode, when they decided to beam the Sword of Kahless (really a Bat'leth) into space rather than have it sow discord on Kronos. That was the perfect moment for Kor to have said, "It would have been glorious."
Also, as I am part of the "transporter kills you every time you use it and a duplicate walks away at point B" crowd, I also think that beaming a true nonesuch also destroys what it was, originally--ie, the Mona Lisa put in a transporter is not the Mona Lisa on the other side. So as far as I'm concerned, they destroyed the Sword of Kahless. But I love this ep, anyway.