"Star Trek" is home to countless alien species, many of whom offer beloved characters. Some are not. We rank the 10 most ...

Parasites don’t just steal nutrients — many actively take control of their hosts’ behavior. From fungi that force insects to ...

From space slugs to lunar cemeteries, these movies, games, and books show that the undead can arrive from above, as well as below.

Alien set a standard for the sci-fi horror genre, but in the years since, new TV mediums have put their own spin on the grotesque idea.