Evil Goatees

In the world of television, from Star Trek to Knight Rider, evil twins abound. Whether they're from other dimensions or simply siblings who've gone taken the wrong road in life, all are marked by one distinguishing trait. They look exactly like the hero, but for the fact that they're sporting the "evil goatee", the only thing that physically sets them apart from their clean-shaven (and thus non-evil) doppelgangers.