From the Star Wars spin-off The Mandalorian to the classic series Star Trek: The Next Generation, these are the best sci-fi shows that feature aliens.

Throughout its run, The Twilight Zone frequently found inventive ways to use aliens, and these are the show's best episodes ...

Pioneering astronomer Carl Sagan once wrote that "The universe is a pretty big place. If it's just us, seems like an awful waste of space." On screen, the vastness of the universe and the ...