Klingons, in TOS, did not have ridges. It was explained in ENT, that a large part of the population was infected, by their own people, with an augment virus which caused the victims to take on human traits. So, there are Klingons with and without smooth foreheads, and yes, that is canon.Well, the smooth foreheads are canon...![]()
Um , no they are not. Wish they were though I thought the Next Genie Kligon makeup looked B movie aweful
I never thought that explanation was necessary.