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Kahless and Klingon Appearance

Going from Star Trek TOS to TNG, Klingons change quite a bit. Does anyone know the explanation given for this? I know in an episode of DS9 in the trouble with tribbles flashback, Worf sort of mentions that something happened but I'm not exactly sure what it was.

Wolverette
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  • Related: http://scifi.stackexchange.com/questions/20579/are-there-in-universe-explanations-for-how-some-species-apperances-change-betwe?lq=1 – Iszi Jul 31 '12 at 18:31
  • ST Enterprise covered this with detail, and dedicated several episodes to it. – Nate Watson Jun 28 '15 at 16:35

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