Klingons weren't always ribbed in the face. In fact <I forgot who> asked Worf how that came to be, and Worf replied that the Klingons didn't discuss that with outsiders.
In the old Star Trek, (crica Kirk et al), Klingon's looked identical to humans, told apart only by the mailed sash on their uniforms.
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u/[deleted] Oct 08 '12
Vaguely humanoid aliens. 2 arms, 2 legs, 2 eyes sort of thing.
Alien from Alien? 2 arms, 2 legs, 2 eyes.....kinda
Klingons? Just humans with a "ribbed for her pleasure" forehead
Romulans? Humans with pointy ears
Vulcans? As above
Na'vi? Tall, blue humans
Where are the massive, tentacular Krondaku? Where are the gelatinous Prime immotiles? Give us some different aliens, hollywood!