It's not just iconic characters like Kirk, Spock, and Janeway that have made "Star Trek" one of the best science fiction franchises of all time. It's also its memorable alien races like the Klingons, ...

Move over Xenomorph — these are the most mind-bendingly terrifying aliens in fiction. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Breaking ...

With tons of "Star Trek" alien races depicted over the decades, consistency is a tall order. And in the case of these aliens, major changes went unexplained.