6. The Kazon - Early Voyager
You just want to introduce these guys to a comb and get those bits of eggshell out of their hair. Billed as the Big Bad of early Voyager they were a bit of a disappointment because, well, they were just short Klingons with manners. The below par makeup didn't help as it felt more like we'd skipped back into the Alpha Quadrant rather than exploring strange new worlds 75,000 light years across the galaxy. More of a slap in the face was that these were one of the first races we met in the pilot episode. If I was Janeway I'd have felt a bit shortchanged when it came to discovering new life and new civilisations had I known they would be rehashed from the another series. These could have been truly different, unique and perhaps a smidgeon terrifying but instead there's a familiar crinkle in the forehead. We should have realised that at this point that a lot of chances could be missed. The Kazon lasted a couple of years and were never refined. Their look betrayed something of their nature too as only once did they pose any serious issues to the ship and were soon forgotten and left behind in the far reaches of the Delta Quadrant. Interestingly the Kazon's mortal enemies and former masters, the Trabe, also bordered on lazy makeup, possibly into "The Bajoran" territory with a stick on forehead piece that Charles Lucia got to sport.
Reminds us of: Gowron's Prep School educated nephew