updated: 06/01/2006
The Romulans are closely related to Vulcans but are devious and untrustworthy. Both have been around the Star Trek universe since the original series.
Their makeup has changed
over
the
years
but less
so than
the design for Klingons:
the most immediately noticeable change (besides the forehead prosthetic) is their wholescale adoption of a particularly unflattering hairstyle.