Star trek Enterprise
Okay, supposedly all homeworld Klingons always had those ridges. It’s just the Federation first made contact with a special group of Klingons that had for some reason or another been genetically engineered not to have ridges. The subject has not really been addressed besides a mention of “some sort of genetic engineering” and a book on [i]Star Trek[/i]’s alien races that is not considered canonical.
The real reason is, of course, that in the time of the original series they couldn’t afford extensive makeup on a major guest-race (that’s why the Klingons appeared so much more often than the Romulans with the expensive ears), so they just made some people up to look mean and slightly inhuman and called them “Klingons.” Then when the first movie came out and Gene Roddenbery actually had a budget he decided to show it off any way he could, and one of those ways was to put ridges on the Klingons’ heads.
If the [i]Star Trek[/i] makers are concerned with continuity (and they usually aren’t) the Klingons encountered by the [i]Enterprise[/i] will [b]not[/b] have ridges.
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Lee P. Sherman, code name DalekTek790
Whovian, Froudian, Lexxian, etc.